Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog (Litoria verreauxii alpina)

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Wendt" }, { "@type": "Person", "name": "Laura Brannelly" } ], "publisher": { "@type": "Organization", "name": "F1000Research", "logo": { "@type": "ImageObject", "url": "https://f1000research.com/img/AMP/F1000Research_image.png", "height": 480, "width": 60 } }, "image": { "@type": "ImageObject", "url": "https://f1000research.com/img/AMP/F1000Research_image.png", "height": 1200, "width": 150 }, "description": "The alpine tree frog (Litoria verreauxii alpina) is a threatened species found only above 1,200 meters within the Australian Alps. This species’ distribution has been severely limited due to the pathogentic amphibian chytrid fungus, and current populations persist by recruitment. Here, we provide the first publicly available genome for the genus. We used PacBio HiFi reads as well as Hi-C scaffolding data to construct a high-quality genome. We also generated a reproduction focused transcriptome from brain, liver, and gonad tissues. The genome was 2.77 Gb in length and consisted of 962 contigs with a contig N50 of 37.2 Mb and an L50 of 19. This study provides the first publicly available reference genome for the Litoria genus to assist in conservation and reproduction focused works in amphibian management." } { "@context": "http://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": "1", "item": { "@id": "https://f1000research.com/", "name": "Home" } }, { "@type": "ListItem", "position": "2", "item": { "@id": "https://f1000research.com/browse/articles", "name": "Browse" } }, { "@type": "ListItem", "position": "3", "item": { "@id": "https://f1000research.com/articles/14-514/v2", "name": "Reference genome and reproduction-focused transcriptome for the threatened..." } } ] } Home Browse Reference genome and reproduction-focused transcriptome for the threatened... ALL Metrics - Views Downloads Get PDF Get XML Cite How to cite this article Wendt AS and Brannelly L. Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] . F1000Research 2025, 14 :514 ( https://doi.org/10.12688/f1000research.163701.2 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. Close Copy Citation Details Export Export Citation Sciwheel EndNote Ref. Manager Bibtex ProCite Sente EXPORT Select a format first Track Share ▬ ✚ Genome Note Revised Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] Alexander S. Wendt https://orcid.org/0000-0002-5113-0206 1 , Laura Brannelly https://orcid.org/0000-0003-2975-9494 1 Alexander S. Wendt https://orcid.org/0000-0002-5113-0206 1 , Laura Brannelly https://orcid.org/0000-0003-2975-9494 1 PUBLISHED 02 Sep 2025 Author details Author details 1 Department of Veterinary Sciences, The University of Melbourne Faculty of Science, Werribee, Victoria, 3030, Australia Alexander S. Wendt Roles: Conceptualization, Data Curation, Formal Analysis, Funding Acquisition, Investigation, Methodology, Visualization, Writing – Original Draft Preparation, Writing – Review & Editing Laura Brannelly Roles: Funding Acquisition, Project Administration, Resources, Supervision, Writing – Review & Editing OPEN PEER REVIEW DETAILS REVIEWER STATUS This article is included in the Genomics and Genetics gateway. This article is included in the Galaxy gateway. Abstract The alpine tree frog ( Litoria verreauxii alpina ) is a threatened species found only above 1,200 meters within the Australian Alps. This species’ distribution has been severely limited due to the pathogentic amphibian chytrid fungus, and current populations persist by recruitment. Here, we provide the first publicly available genome for the genus. We used PacBio HiFi reads as well as Hi-C scaffolding data to construct a high-quality genome. We also generated a reproduction focused transcriptome from brain, liver, and gonad tissues. The genome was 2.77 Gb in length and consisted of 962 contigs with a contig N50 of 37.2 Mb and an L50 of 19. This study provides the first publicly available reference genome for the Litoria genus to assist in conservation and reproduction focused works in amphibian management. READ ALL READ LESS Keywords Anuran, Hylidae, genome assembly, conservation, Australia, threatened species Corresponding Author(s) Alexander S. Wendt ( [email protected] ) Close Corresponding author: Alexander S. Wendt Competing interests: No competing interests were disclosed. Grant information: This work was supported with funding by the American Australian Association, the University of Melbourne, and the Australian Research Council (DE190101395). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Copyright: © 2025 Wendt AS and Brannelly L. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. How to cite: Wendt AS and Brannelly L. Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] . F1000Research 2025, 14 :514 ( https://doi.org/10.12688/f1000research.163701.2 ) First published: 23 May 2025, 14 :514 ( https://doi.org/10.12688/f1000research.163701.1 ) Latest published: 02 Sep 2025, 14 :514 ( https://doi.org/10.12688/f1000research.163701.2 ) Revised Amendments from Version 1 Removed duplicate citation and changed Omni-C to Hi-C where possible throughout. Removed duplicate citation and changed Omni-C to Hi-C where possible throughout. See the authors' detailed response to the review by Yanbo Sun READ REVIEWER RESPONSES Introduction The alpine tree frog ( Litoria verreauxii alpina ; Figure 1 ) is endemic to the Australian Alps of New South Wales and Victoria, occurring at elevations above 1,200 meters ( Brannelly et al. , 2015 ). Since the introduction of the pathogenic amphibian chytrid fungus Batrachochytrium dendrobatidis ( Bd ) to Australia, the species’ distribution has declined by over 80% since the 1980s, leaving only a few remaining populations ( Gillespie, Osborne, & McElhinney, 1995 ; Hunter, Osborne, & Smith, 1998 ; Osborne, Hunter, & Hollis, 1999 ; Hunter et al. , 2009 ). Adult L. v. alpina are highly susceptible to Bd infection, with prevalence rates approaching 100% during the breeding season ( Brannelly et al. , 2015 ; Scheele et al. , 2015 ). The species exhibits minimal protective immunity against the disease, leading to near-complete population turnover each breeding cycle ( Bataille et al. , 2015 ; Grogan et al. , 2018 ; Brannelly et al. , 2015 ; Scheele et al. , 2015 ). Figure 1. Photograph of a captive-bred alpine tree frog ( Litoria verreauxii alpina ). Photo by Tiffany Kosch and Corey Doughty. Despite these challenges, the remaining L. v. alpina populations persist, largely due to a compensatory reproductive strategy. Infected individuals exhibit increased reproductive effort, as evidenced by larger gonadal structures and higher gamete production compared to uninfected counterparts ( Scheele et al. , 2015 ; Brannelly et al. , 2016, 2021, 2025 ). This strategy may help offset high mortality rates, ensuring continued recruitment despite the overwhelming impact of Bd. However, the long-term effectiveness of this response remains uncertain, particularly as other environmental pressures further threaten population stability. Understanding the genetic mechanisms underlying this reproductive adaptation is crucial for assessing the species’ resilience and informing conservation strategies. The Litoria genus, to which L. v. alpina belongs, is highly diverse, comprising over 150 recognized species across Australia (‘ AmphibiaWeb’, 2025 ). Despite its ecological and evolutionary significance, no publicly available reference genomes for any species within the genus were identified in the Australian Reference Genome Atlas (ARGA) as of February 25, 2025 ( Hall et al. , 2023 ). To address this gap, we generated a high-quality reference genome for L. v. alpina , along with a reproduction-focused transcriptome derived from tissues critical to reproductive function which included the brain, liver, and gonads. These genomic resources provide a foundation for investigating genetic variation within the species, shedding light on how L. v. alpina maintains population persistence in the face of extreme disease pressure. Additionally, this work fills a critical gap in genomic knowledge within Litoria , offering new opportunities to study evolutionary relationships, reproductive adaptations, and broader ecological dynamics across the genus. Methods Sample collection and DNA/RNA extraction Samples were collected from two adult males and one adult female L. v. alpina that were lab-raised from eggs at the University of Melbourne, Werribee campus, Victoria, Australia ( Brannelly, Sharma, & Wallace, 2023 ). The individuals sampled were part of a larger experiment that involved humane euthanasia as the endpoint. Individuals were medically euthanized via immersion for ≥10 min in 3 mL of 100 mg/L tricaine methanesulfonate (MS-222) buffered with sodium bicarbonate. Individuals were removed from the MS-222 solution after becoming unresponsive and immediately decapitated (University of Melbourne’s Animal Ethics application: 26083). Tongue, muscle from the right thigh, and liver tissue were removed from one male (Lva_1) while brain, liver, and gonads (testes or ovaries) were extracted from the other male and female individual (Lva_2 and Lva_3 respectively). All samples were flash frozen using liquid nitrogen and stored at -80°C until extraction. High molecular weight (HMW) DNA was extracted from the tongue and muscle tissue of Lva_1 using the Monarch® HMW DNA Extraction Kit for Cells & Blood (New England Biolabs: T3050S) following the manufacturer protocols. Concentrations and quality were then assessed via a Femto Pulse genomic DNA 165 kb kit (Agilent: FP-1002-0275), Qubit™ dsDNA BR assay kit (Thermo Fisher Scientific; Table 1 ), and NanoDrop (Thermo Fisher Scientific; Table 1 ), with the highest yielding sample used for library preparation. Table 1. HMW DNA concentrations and purity measurements for muscle and tongue tissue from individual Lva_1. Sample Qubit (ng/μL) Nanodrop (ng/μL) 260/280 260/230 Lva_1_Muscle 11.6 19.4 1.62 0.86 Lva_1_Tongue 376 178.1 1.79 1.88 Total RNA was extracted from the brain, liver, and gonad tissues collected from Lva_2 and Lva_3 individuals using the RNAeasy Plus Mini Kit (Qiagen: 74134) with RNAse-free DNAse I set (Qiagen: EN0521) digestion. RNA quantity was determined using a Qubit 3 fluorometer with an Invitrogen™ Qubit RNA High Sensitivity Kit (Thermo Fisher Scientific) and RNA integrity (RIN) score determined using a 5200 Fragment Analyzer (Agilent; Table 2 ). Table 2. RNA concentrations and quality scores for brain, liver, and gonad samples from male (Lva_2) and female (Lva_3) Litoria verreauxii alpina. Sample Concentration (ng/μL) Quality Score (RIN) Total (ng) DV200 (%) Lva_2_Brain 25.8 9.6 801 90 Lva_2_Liver 16.5 9.9 512 88 Lva_2_Testes 56.3 10.0 1746 93 Lva_3_Brain 14.0 9.8 433 86 Lva_3_Liver 4.2 - 129 66 Lva_3_Ovary 23.8 9.9 738 91 Library construction and sequencing The HMW DNA from Lva_1 tongue tissue was sent for Pacific Biosciences High Fidelity (PacBio HiFi) library preparation with a SMRTbell® prep kit 3.0 (Pacific Biosciences: 102-141-700) and Revio™ polymerase kit (Pacific Biosciences: 102-739-100) and sequencing on one single molecule real-time (SMRT) cell on a PacBio Revio at Australian Genome Research Facility (AGRF), Brisbane, Australia. Two LinkPrep libraries were prepared from liver tissue from Lva_1 using the Dovetail® LinkPrep™ Kit (Cantata Bio) at the Advanced Genomics Services of the Australian Genome Research Facility. Briefly, the chromatin was fixed with disuccinmidyl glutarate (DSG) and formaldehyde in the nucleus. The cross-linked chromatin was then fragmented and tagged with Tn5 transposase in situ. Next, the cells were lysed to extract the chromatin fragments, which were subsequently bound to chromatin capture beads. Proximity ligation was then performed, whereby chromatin fragments that were in proximity to one another were ligated together. After proximity ligation, the crosslinks were reversed, the associated proteins were degraded, and the DNA was purified and converted into a sequencing library. Each library was sequenced on an Illumina Novaseq X plus platform to generate 2 million 2 × 150 bp read pairs to assess the quality of mapping, valid cis - trans reads and complexity of the library. For chromosome level assembly, each library was sequenced approximately 100 million 2 × 150 bp read pairs per Gb of the genome size at the Australian Genome Research Facility, Melbourne, Australia. Total RNA from the brain, liver, and gonads of individuals Lva_2 and Lva_3 was prepared using Illumina Total RNA with RiboZero Plus library preparation and sequenced as 150 bp paired-end reads on an Illumina NovaSeq 6000 at the Australian Genome Research Facility, Melbourne, Australia. Genome assembly Genome assembly was conducted on the Galaxy Australia platform using workflows developed by Bioplatforms Australia Threatened Species Initiative, Galaxy Australia, and the Australian BioCommons ( https://australianbiocommons.github.io/how-to-guides/ ). After the upload of the raw HiFi reads in.ccs.bam format provided by AGRF, we used the BAM to FASTQ + QC v1.0 workflow ( Price, 2022 a ). This utilizes SamtoFastq v2.18.2.2 ( Broad Institute, 2009 ), Samtools flagstat v2.0.3 ( Danecek et al. , 2021 ), and FastQC v0.72 ( Andrews, 2010 ). Following file conversion, we ran the PacBio HiFi genome assembly using hifiasm v2.1 workflow ( Price & Farquharson, 2022 ). This process produced a draft genome assembly in FASTA format, accompanied by assembly metrics and a detailed report. HiFi reads underwent adapter sequence removal using HiFiAdapterFilt v2.0.0 ( Sim et al. , 2022 ), followed by de novo assembly using hifiasm v0.16.1 ( Cheng et al. , 2021 ). To evaluate assembly structure and completeness, the assembly graph was visualized using Bandage Image v0.8.1 ( Wick et al. , 2015 ). Bandage Info v0.8.1 was used to extract key assembly statistics, such as contig N50 and total assembly length, providing insights into the overall quality of the assembly. To enhance the assembly’s accuracy, the purge duplicates from hifiasm assembly v1.0 workflow ( Price, 2022 b ) was applied to remove haplotype repeats. This step uses minimap2 v2.28 ( Li, 2018 ) and purge_dups v1.2.6 ( Guan et al. , 2020 ) to align and purge duplicates based on read depth. We then scaffolded the Hi-C reads with the genome using the TSI scaffolding with HiC (based on VGP-HiC-scaffolding) v1.0 workflow ( Syme & Silver, 2024 ). The scaffolding workflow utilizes several tools including BWA-MEM2 v2.2.1 ( Li & Durbin, 2010 ; Li, 2013 ), YAHS v1.21.2 ( Zhou, McCarthy, & Durbin, 2023 ), gfastats v1.3.10 ( Formenti et al. , 2022 ), bedtools BAM to BED v2.31.1 ( Quinlan & Hall, 2010 ), and PretextMap v0.1.9 ( Harry, n.d. ). The finished genome was assessed using the genome assessment post assembly workflow ( Farquharson et al. , 2024 ), which produces Fasta statistics v2.0, Quast v5.0.2 ( Mikheenko et al. , 2018 ), BUSCO v5.4.6 ( Simão et al. , 2015 ), and Merqury v1.3 ( Rhie et al. , 2020 ) outputs. Transcriptome assembly Transcriptome assembly was also conducted on the Galaxy Australia platform using workflows developed by Bioplatforms Australia Threatened Species Initiative. To minimize interference from repetitive genomic elements, the reference genome was first subjected to repeat masking using the Repeat Masking v3.0 workflow ( Silver & Syme, 2024 a ). The workflow processed the reference genome FASTA file, generating both hard-masked and soft-masked genome files along with a statistics report detailing the extent of masking. Quality control and adapter trimming of raw RNA sequencing reads were performed using the QC and Trimming of RNAseq Reads v1.0 workflow ( Silver & Syme, 2024 b ) for each tissue separately. This step involved filtering low-quality bases and removing sequencing adapters. Trimmomatic Galaxy v0.36.6 was used to trim-reads specifying NEXTERA (pair-ended) adapters, SLIDING-WINDOW:4:5, LEADING:5, TRAILING:5 and MINLEN:25 ( Bolger, Lohse, & Usadel, 2014 ). The soft repeat-masked genome was indexed and reads were aligned using HiSAT2 v2.2.1 ( Kim et al. , 2019 ). Quality was assessed using FASTQC v0.74 ( Andrews, 2010 ), and the processed reads were retained as paired FASTQ files for subsequent analysis. Processed RNA-Seq reads were aligned by tissue and individual of origin to the soft-masked reference genome using the Align Reads to Find Transcripts v1.0 workflow ( Silver & Syme, 2024 c ). This alignment generated BAM and GTF files, providing transcript structures and alignment metrics to aid in genome annotation. Transcriptome assembly was conducted using the Combine Transcripts v1.0 workflow ( Silver & Syme, 2024 d ), which integrated tissue-specific transcript data into a comprehensive global transcriptome. Coding sequences were predicted based on sequence homology with Xenopus laevis coding DNA (cDNA) downloaded from NCBI. The workflow output included a GTF file representing the global transcriptome and FASTA sequences of coding transcripts. To identify the longest isoforms, the Extract Longest Transcripts v1.0 workflow ( Silver & Syme, 2024 e ) was applied. TransDecoder was used to predict coding sequences, filtering transcripts to retain only the longest isoform per gene. The resulting outputs included peptide FASTA files, coding sequence FASTA files, and GFF3 annotation files for further analyses. The final step involved converting the transcriptome annotation outputs into formats compatible with genome annotation tools. The Convert Outputs v1.0 workflow ( Silver & Syme, 2024 f ) was used to process TransDecoder peptide FASTA files and global nucleotide FASTA files into .cdna, .dat, and .pro formats required for downstream annotation applications. Genome annotation Genome annotation was performed using the FgenesH++ tool on the Galaxy Australia platform using the assembled reference genome, the hard-masked genome and the.cdna, .pro, and.dat files generated by the Convert Outputs v1.0 ( Silver & Syme, 2024 f ) workflows as input files. The Fgenesh annotation v3.0 workflow ( Silver, 2024 ) was executed, which involves genome splitting, annotation, merging of annotation files, and extraction of mRNA, CDS, and protein sequences. The settings used the Xenopus (generic frog) gene-finding matrix and a non-mammalian database. The outputs included GFF3 files of annotated genes and FASTA files for mRNA, CDS, and protein sequences. BUSCO v5.4.6 in ‘protein’ modes was used to assess the annotation with the tetrapoda_odb10 lineage. Results Genome size and assembly Assembly of the male Litoria verreauxii alpina resulted in a genome of 2.77 Gb, which was comprised of 962 contigs with a contig N50 of 37.17 Mb. The genome was sequenced using PacBio HiFi reads which generated 87.92 Gb from 7,764,356 reads, resulting in a coverage of 31.74×. Primary assembly contigs were scaffolded using proximity-based enrichment Hi-C data ( Figure 2 ), which produced 248.99 Gb from 829,962,675 reads. Genome scaffolding with this data resulted in 774 scaffolds with 188 gaps and a scaffold N50 of 267.09 Mb ( Table 3 ). The majority (91.3%) of the assembly mapped to the first 13 scaffolds, reflecting the 13 chromosome karyotype described for the species ( Schmid et al. , 2018 ) and within other Litoria species ( Ferro et al. , 2018 ; Mollard, Mahony, & West, 2024 ; Kosch et al. , 2025 ). Figure 2. Hi-C contact map of the L.v. alpina reference genome. Left: represents contacts for the first 12 scaffolds of the genome. Right: represents contacts for all 774 scaffolds of the genome. Scaffolds are shown in order of size from top-left going right at a diagonal. Table 3. Genome assembly statistics for the Litoria verreauxii alpina genome. Genome assembly Assembly length 2,772,442,494 Number of contigs 962 Contig N50 37,168,586 Contig L50 19 Contig N90 2,484,530 Contig L90 130 Longest contig 169,435,372 Number of scaffolds 774 Scaffold N50 267,093,197 Scaffold L50 4 Scaffold N90 36,543,458 Scaffold L90 12 Longest scaffold 522,534,866 GC content % 43.04 Read coverage 31.74 The Merqury estimated Quality Value (QV) of the final assembly was 63.7 with an error rate of 4.2e −7 . Completeness with Merqury was lower than expected at 78.6%, which is most likely due to the fact that the purge duplicates workflow removed a high number of repetitive sequences and haplotigs ( Figure 3 ). Before purging, the genome was 2777517237 bp and had a 100% completeness score. After purging, the genome was reduced to 2772442494 bp with most of the purged sequences labeled as high coverage, haplotig, or repeat sequences. BUSCO v5.4.6 indicated a completeness of 90.1% (single = 86.7%, duplicate = 3.4%), using the tetrapoda_odb10 reference set (n = 5310) ( Table 4 ). Figure 3. Merqury output showing the copy number of k-mers. ‘k-mer multiplicity’ records the number of times a certain k-mer appears in the reads, and ‘Count’ records the number of k-mers that have appeared that number of times. Grey represents the k-mers found only in the reads, while the colors correspond to the number of k-mers that have appeared at that given number of times. Table 4. Genome assembly metrics of the completed Litoria verreauxii alpina genome. Genome assembly metrics Quality value (QV) * 63.7 (4.2e −7 ) Completeness 78.6% BUSCO ** C:90.1% [S:86.7%, D:3.4%], F:2.9%, M:7.0%, n:5310 * Consensus quality value (error rate). ** BUSCO scores based on the tetrapoda_odb10 BUSCO reference set using version 5.4.6. C = complete, S = single copy, D = duplicated, F = fragmented, M = missing, n = number of orthologues in comparison. Transcriptome assembly and genome annotation After quality trimming, 99.48% of reads were retained. Individual tissues had a high number of duplicate reads ranging from 57.2% – 85.0%. The individual tissue transcriptomes had varying mapping rates to the soft repeat-masked genome (78.77% female brain; 77.89% male brain; 80.59% female liver; 83.50% male liver; 80.92% ovary; 81.59% testes). A total of 98760 transcripts were used as evidence for the genome annotation. Repetitive elements comprised 61.43% of the total genomic sequence, with 41.88% of these consisting of unclassified repeats. A total of 40092 genes were predicted from the annotation ( Table 5 ). There was an average of 6.2 exons (SE=34.6) per putative gene with an average exon length of 229 bp (SE=556) and an average intron length of 3353 bp (SE=12458). The reproduction focused annotation had 65.4% BUSCOs [Single copy: 62.8%; Duplicated: 2.6%]; 14.2% fragmented BUSCOs and 20.4% missing BUSCOs. Table 5. Reproduction focused genome transcriptome statistics, repeat content, and alignment of the Litoria verreauxii alpina genome. Genome annotation statistics % of genome Average size (bp) Median size (bp) n Exon 2 229 126 249568 Gene 28 19299 7699 40092 Intron 25 3353 1033 209476 Genome repeat content Repeat element Number of elements % of genome DNA transposons 867221 9.69 LINEs 444639 5.79 SINEs 31630 0.23 LTRs 386024 3.84 Simple 81751 0.14 Unclassified 6153713 41.88 Total interspersed repeats 61.43 Small RNA 50566 0.46 Satellites 5903 0.13 Simple repeats 81751 0.14 Ethical considerations Frogs were humanely euthanized following the completion of previous experimental procedures under the University of Melbourne (Victoria, Australia) Animal Ethics permit #26083. Data availability Underlying data The raw PacBio HiFi, Omni-C, and RNA read data is publicly available from NCBI’s Short Read Archive (SRA) accession numbers: SRR32377441, SRR32377442, SRR32314942-SRR32314944, SRR32314946, SRR32581849, SRR32581850 ( Wendt & Brannelly, 2025a ). And the assembled genome is available on NCBI’s Assembly database, BioProject: PRJNA1219307 ( Wendt & Brannelly, 2025b ). Reporting guidelines The Arrive Author Checklist can be found on the University of Melbourne Figshare: Author Checklist – ARRIVE.pdf, HYPERLINK https://doi.org/10.26188/28899941.v2 ( Wendt & Brannelly, 2025c ). Data are available under the terms of the Creative Commons Zero “No rights reserved” data waiver (CC0 Public domain dedication). References AmphibiaWeb: University of California, Berkeley, CA, USA.2025. Accessed 20 February 2025. Reference Source Andrews S: FastQC - A quality control tool for high throughput sequence data. Babraham Bioinformatics. 2010. 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Sequence Read Archive, NCBI. 2025a. Reference Source Wendt AS, Brannelly LA: Litoria verreauxii alpina genome sequencing and assembly. Bioproject, NCBI. 2025b. Reference Source Wendt AS, Brannelly LA: Author Checklist - ARRIVE.pdf. The University of Melbourne. Figshare; 2025c. Publisher Full Text Wick RR, Schultz MB, Zobel J, et al. : Bandage: Interactive visualization of de novo genome assemblies. Bioinformatics. 2015; 31 : 3350–3352. PubMed Abstract | Publisher Full Text | Free Full Text Zhou C, McCarthy SA, Durbin R: YaHS: yet another Hi-C scaffolding tool. Bioinformatics. 2023; 39 . PubMed Abstract | Publisher Full Text | Free Full Text Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 23 May 2025 ADD YOUR COMMENT Comment Author details Author details 1 Department of Veterinary Sciences, The University of Melbourne Faculty of Science, Werribee, Victoria, 3030, Australia Alexander S. Wendt Roles: Conceptualization, Data Curation, Formal Analysis, Funding Acquisition, Investigation, Methodology, Visualization, Writing – Original Draft Preparation, Writing – Review & Editing Laura Brannelly Roles: Funding Acquisition, Project Administration, Resources, Supervision, Writing – Review & Editing Competing interests No competing interests were disclosed. Grant information This work was supported with funding by the American Australian Association, the University of Melbourne, and the Australian Research Council (DE190101395). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Article Versions (2) version 2 Revised Published: 02 Sep 2025, 14:514 https://doi.org/10.12688/f1000research.163701.2 version 1 Published: 23 May 2025, 14:514 https://doi.org/10.12688/f1000research.163701.1 Copyright © 2025 Wendt AS and Brannelly L. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Download Export To Sciwheel Bibtex EndNote ProCite Ref. Manager (RIS) Sente metrics Views Downloads F1000Research - - PubMed Central info_outline Data from PMC are received and updated monthly. - - Citations open_in_new 0 open_in_new 0 open_in_new SEE MORE DETAILS CITE how to cite this article Wendt AS and Brannelly L. Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] . F1000Research 2025, 14 :514 ( https://doi.org/10.12688/f1000research.163701.2 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS track receive updates on this article Track an article to receive email alerts on any updates to this article. TRACK THIS ARTICLE Share Open Peer Review Current Reviewer Status: ? Key to Reviewer Statuses VIEW HIDE Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Version 1 VERSION 1 PUBLISHED 23 May 2025 Views 0 Cite How to cite this report: Knytl M. Reviewer Report For: Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] . F1000Research 2025, 14 :514 ( https://doi.org/10.5256/f1000research.180093.r387736 ) The direct URL for this report is: https://f1000research.com/articles/14-514/v1#referee-response-387736 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 16 Jun 2025 Martin Knytl , Charles University, Viničná, Czech Republic Approved VIEWS 0 https://doi.org/10.5256/f1000research.180093.r387736 The proposed manuscript “Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog (Litoria verreauxii alpina)” presents a valuable de-novo genome assembly at the scaffold level for this threatened species. One of the key fundings is the mapping of ... Continue reading READ ALL The proposed manuscript “Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog (Litoria verreauxii alpina)” presents a valuable de-novo genome assembly at the scaffold level for this threatened species. One of the key fundings is the mapping of over 90% of reads to the 13 largest scaffolds, leading the authors to propose these to represent 13 chromosomes in the karyotype of L. v. alpina. The manuscript contributes to genomics, offering a usable and reproducible resource - the genome assembly is already deposited in the NCBI database. I found no fundamental issues within the proposed manuscript. It is technically sound and written in high-quality English. Furthermore, all methods and results pertaining to the genome and transcriptome analyses are presented with clarity, and the text is well-structured, creating a coherent narrative. I have only minor comments/questions to further enhance the manuscript's clarity: 1) Species Description: The introduction could benefit from a more detailed description of the species L. v. alpina. Specifically, including its taxonomic classification (e.g., the family level, batrachia subgroup) and relevant phylogenetic context would be valuable for readers less familiar with this organism. 2) Scaffold Count and Chromosome Number: The authors propose that the 13 largest scaffolds likely represent the 13 chromosomes. However, Table 3 indicates an L90 of 12 scaffolds. Clarification would be beneficial as to whether the L90 value of 12 scaffolds has any bearing on the chromosomal count (and if Table 3 might have a typo), or if it's an independent assembly metric. Are the rationale for sequencing the genome and the species significance clearly described? Yes Are the protocols appropriate and is the work technically sound? Yes Are sufficient details of the sequencing and extraction, software used, and materials provided to allow replication by others? Yes Are the datasets clearly presented in a usable and accessible format, and the assembly and annotation available in an appropriate subject-specific repository? Yes Competing Interests: No competing interests were disclosed. Reviewer Expertise: Chromosome evolution, Sex chromosomes, Polyploidy, Cytogenetics, Evolutionary genomics, Sanger sequencing, Genome editing, Cytogenomics I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Knytl M. Reviewer Report For: Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] . F1000Research 2025, 14 :514 ( https://doi.org/10.5256/f1000research.180093.r387736 ) The direct URL for this report is: https://f1000research.com/articles/14-514/v1#referee-response-387736 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Respond or Comment COMMENT ON THIS REPORT Views 0 Cite How to cite this report: Sun Y. Reviewer Report For: Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] . F1000Research 2025, 14 :514 ( https://doi.org/10.5256/f1000research.180093.r387730 ) The direct URL for this report is: https://f1000research.com/articles/14-514/v1#referee-response-387730 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 06 Jun 2025 Yanbo Sun , Yunnan University, Kunming, China Approved VIEWS 0 https://doi.org/10.5256/f1000research.180093.r387730 Summary of the Article The study presents the first reference genome (2.77 Gb) and a reproduction-focused transcriptome for the threatened alpine tree frog (Litoria verreauxii alpina), a species endemic to the Australian Alps. The genome was assembled using ... Continue reading READ ALL Summary of the Article The study presents the first reference genome (2.77 Gb) and a reproduction-focused transcriptome for the threatened alpine tree frog (Litoria verreauxii alpina), a species endemic to the Australian Alps. The genome was assembled using PacBio HiFi reads (31.74× coverage) and scaffolded with Omni-C proximity ligation data. Transcriptomes were generated from brain, liver, and gonad tissues of male and female frogs. The genome assembly yielded 774 scaffolds with a scaffold N50 of 267.09 Mb, and annotation predicted 40,092 genes. The work aims to support conservation efforts by elucidating genetic mechanisms behind the species' compensatory reproductive strategy, which offsets high mortality from chytridiomycosis. While data accessibility and rationale are exemplary, methodological opacity and technical inconsistencies must be resolved to ensure replicability and scientific rigor. Insufficient parameter details: Assembly tools (e.g., hifiasm, minimap2, purge_dups) lack runtime parameters, k-mer sizes, or filtering thresholds. BUSCO vs. Merqury discrepancy: The genome completeness dropped from 100% (pre-purge) to 78.6% (post-purge) in Merqury, while BUSCO reported 90.1%. Authors must reconcile this by analyzing purged sequences (e.g., whether critical genes were removed). Software versions are provided (e.g., hifiasm v0.16.1), but critical parameters (e.g., --purge-dups thresholds, Hi-C scaffolding stringency) are omitted. RNA-Seq trimming parameters are noted, but adapter sequences and quality-filtering cutoffs are not specified. Ethical permit details lack a link to institutional guidelines or approval documentation. Are the rationale for sequencing the genome and the species significance clearly described? Yes Are the protocols appropriate and is the work technically sound? Partly Are sufficient details of the sequencing and extraction, software used, and materials provided to allow replication by others? Partly Are the datasets clearly presented in a usable and accessible format, and the assembly and annotation available in an appropriate subject-specific repository? Yes Competing Interests: No competing interests were disclosed. Reviewer Expertise: Evolutionary genomics of amphibians and reptiles I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Sun Y. Reviewer Report For: Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] . F1000Research 2025, 14 :514 ( https://doi.org/10.5256/f1000research.180093.r387730 ) The direct URL for this report is: https://f1000research.com/articles/14-514/v1#referee-response-387730 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Author Response 02 Sep 2025 Alexander Wendt , Department of Veterinary Sciences, The University of Melbourne Faculty of Science, Werribee, 3030, Australia 02 Sep 2025 Author Response We found that the default parameters within the Galaxy workflows for assembly (e.g., hifiasm, minimap2, purge_dups) were sufficient for our assembly, and adjusting these parameters made no noticeable difference to ... Continue reading We found that the default parameters within the Galaxy workflows for assembly (e.g., hifiasm, minimap2, purge_dups) were sufficient for our assembly, and adjusting these parameters made no noticeable difference to the final output (several test runs with other parameters were performed). Specifically: hifiasm : default -l 44, -m 97, hifiasm determines k-mer sizes automatically during assembly, based on the input read characteristics (such as read length and coverage). No explicit k-mer sizes were set in our workflow. minimap2 : default -N 5, -F 800, -f 0.0002, -g 5000, -r 500, -n 3, -m 40, -p 0.8, purge_dups : default thresholds YaHS Hi-C scaffolding : default settings, including: Mapping quality threshold (-q): 10 Contig and scaffold error correction: both enabled by default. These default settings provided moderate stringency, balancing accuracy and scaffold continuity. We chose to retain these default parameters to ensure easy reproduction of the workflows and minimize potential biases from over-optimization. These parameters are also associated with the version of the workflow and can be referenced accordingly. We thank the reviewer for highlighting this point and are happy to provide these details here to improve transparency. While genome completeness measured by Merqury dropped from 100% to 78.6% post-purge, the BUSCO score remained unchanged. This discrepancy likely reflects the high repetitive content typical of amphibian genomes, as these repetitive elements and high copy-number regions are over represented during initial sequencing and are more susceptible to removal during purging. In contrast, BUSCO targets single-copy orthologs, which remain stable regardless of repeat content. Scaffold 1 was mainly affected during the purging of duplicates and the genome was reduced by 5,074,743 bp. For RNA-Seq trimming, this was specified in the manuscript: Trimmomatic Galaxy v0.36.6 was used to trim reads specifying NEXTERA (pair-ended) adapters, SLIDING-WINDOW:4:5, LEADING:5, TRAILING:5, and MINLEN:25 Regarding the ethical permit details, we have submitted the official approval letter to the journal during the manuscript submission process. While this letter is not intended for public dissemination, it has already been vetted by the journal’s editorial office. Once again, we thank the reviewer for their thoughtful comments and for highlighting these areas for clarification. We believe these additional details will strengthen the manuscript and improve transparency for future readers We found that the default parameters within the Galaxy workflows for assembly (e.g., hifiasm, minimap2, purge_dups) were sufficient for our assembly, and adjusting these parameters made no noticeable difference to the final output (several test runs with other parameters were performed). Specifically: hifiasm : default -l 44, -m 97, hifiasm determines k-mer sizes automatically during assembly, based on the input read characteristics (such as read length and coverage). No explicit k-mer sizes were set in our workflow. minimap2 : default -N 5, -F 800, -f 0.0002, -g 5000, -r 500, -n 3, -m 40, -p 0.8, purge_dups : default thresholds YaHS Hi-C scaffolding : default settings, including: Mapping quality threshold (-q): 10 Contig and scaffold error correction: both enabled by default. These default settings provided moderate stringency, balancing accuracy and scaffold continuity. We chose to retain these default parameters to ensure easy reproduction of the workflows and minimize potential biases from over-optimization. These parameters are also associated with the version of the workflow and can be referenced accordingly. We thank the reviewer for highlighting this point and are happy to provide these details here to improve transparency. While genome completeness measured by Merqury dropped from 100% to 78.6% post-purge, the BUSCO score remained unchanged. This discrepancy likely reflects the high repetitive content typical of amphibian genomes, as these repetitive elements and high copy-number regions are over represented during initial sequencing and are more susceptible to removal during purging. In contrast, BUSCO targets single-copy orthologs, which remain stable regardless of repeat content. Scaffold 1 was mainly affected during the purging of duplicates and the genome was reduced by 5,074,743 bp. For RNA-Seq trimming, this was specified in the manuscript: Trimmomatic Galaxy v0.36.6 was used to trim reads specifying NEXTERA (pair-ended) adapters, SLIDING-WINDOW:4:5, LEADING:5, TRAILING:5, and MINLEN:25 Regarding the ethical permit details, we have submitted the official approval letter to the journal during the manuscript submission process. While this letter is not intended for public dissemination, it has already been vetted by the journal’s editorial office. Once again, we thank the reviewer for their thoughtful comments and for highlighting these areas for clarification. We believe these additional details will strengthen the manuscript and improve transparency for future readers Competing Interests: There are no competing interests Close Report a concern Respond or Comment COMMENTS ON THIS REPORT Author Response 02 Sep 2025 Alexander Wendt , Department of Veterinary Sciences, The University of Melbourne Faculty of Science, Werribee, 3030, Australia 02 Sep 2025 Author Response We found that the default parameters within the Galaxy workflows for assembly (e.g., hifiasm, minimap2, purge_dups) were sufficient for our assembly, and adjusting these parameters made no noticeable difference to ... Continue reading We found that the default parameters within the Galaxy workflows for assembly (e.g., hifiasm, minimap2, purge_dups) were sufficient for our assembly, and adjusting these parameters made no noticeable difference to the final output (several test runs with other parameters were performed). Specifically: hifiasm : default -l 44, -m 97, hifiasm determines k-mer sizes automatically during assembly, based on the input read characteristics (such as read length and coverage). No explicit k-mer sizes were set in our workflow. minimap2 : default -N 5, -F 800, -f 0.0002, -g 5000, -r 500, -n 3, -m 40, -p 0.8, purge_dups : default thresholds YaHS Hi-C scaffolding : default settings, including: Mapping quality threshold (-q): 10 Contig and scaffold error correction: both enabled by default. These default settings provided moderate stringency, balancing accuracy and scaffold continuity. We chose to retain these default parameters to ensure easy reproduction of the workflows and minimize potential biases from over-optimization. These parameters are also associated with the version of the workflow and can be referenced accordingly. We thank the reviewer for highlighting this point and are happy to provide these details here to improve transparency. While genome completeness measured by Merqury dropped from 100% to 78.6% post-purge, the BUSCO score remained unchanged. This discrepancy likely reflects the high repetitive content typical of amphibian genomes, as these repetitive elements and high copy-number regions are over represented during initial sequencing and are more susceptible to removal during purging. In contrast, BUSCO targets single-copy orthologs, which remain stable regardless of repeat content. Scaffold 1 was mainly affected during the purging of duplicates and the genome was reduced by 5,074,743 bp. For RNA-Seq trimming, this was specified in the manuscript: Trimmomatic Galaxy v0.36.6 was used to trim reads specifying NEXTERA (pair-ended) adapters, SLIDING-WINDOW:4:5, LEADING:5, TRAILING:5, and MINLEN:25 Regarding the ethical permit details, we have submitted the official approval letter to the journal during the manuscript submission process. While this letter is not intended for public dissemination, it has already been vetted by the journal’s editorial office. Once again, we thank the reviewer for their thoughtful comments and for highlighting these areas for clarification. We believe these additional details will strengthen the manuscript and improve transparency for future readers We found that the default parameters within the Galaxy workflows for assembly (e.g., hifiasm, minimap2, purge_dups) were sufficient for our assembly, and adjusting these parameters made no noticeable difference to the final output (several test runs with other parameters were performed). Specifically: hifiasm : default -l 44, -m 97, hifiasm determines k-mer sizes automatically during assembly, based on the input read characteristics (such as read length and coverage). No explicit k-mer sizes were set in our workflow. minimap2 : default -N 5, -F 800, -f 0.0002, -g 5000, -r 500, -n 3, -m 40, -p 0.8, purge_dups : default thresholds YaHS Hi-C scaffolding : default settings, including: Mapping quality threshold (-q): 10 Contig and scaffold error correction: both enabled by default. These default settings provided moderate stringency, balancing accuracy and scaffold continuity. We chose to retain these default parameters to ensure easy reproduction of the workflows and minimize potential biases from over-optimization. These parameters are also associated with the version of the workflow and can be referenced accordingly. We thank the reviewer for highlighting this point and are happy to provide these details here to improve transparency. While genome completeness measured by Merqury dropped from 100% to 78.6% post-purge, the BUSCO score remained unchanged. This discrepancy likely reflects the high repetitive content typical of amphibian genomes, as these repetitive elements and high copy-number regions are over represented during initial sequencing and are more susceptible to removal during purging. In contrast, BUSCO targets single-copy orthologs, which remain stable regardless of repeat content. Scaffold 1 was mainly affected during the purging of duplicates and the genome was reduced by 5,074,743 bp. For RNA-Seq trimming, this was specified in the manuscript: Trimmomatic Galaxy v0.36.6 was used to trim reads specifying NEXTERA (pair-ended) adapters, SLIDING-WINDOW:4:5, LEADING:5, TRAILING:5, and MINLEN:25 Regarding the ethical permit details, we have submitted the official approval letter to the journal during the manuscript submission process. While this letter is not intended for public dissemination, it has already been vetted by the journal’s editorial office. Once again, we thank the reviewer for their thoughtful comments and for highlighting these areas for clarification. We believe these additional details will strengthen the manuscript and improve transparency for future readers Competing Interests: There are no competing interests Close Report a concern COMMENT ON THIS REPORT Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 23 May 2025 ADD YOUR COMMENT Comment keyboard_arrow_left keyboard_arrow_right Open Peer Review Reviewer Status info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Reviewer Reports Invited Reviewers 1 2 Version 2 (revision) 02 Sep 25 Version 1 23 May 25 read read Yanbo Sun , Yunnan University, Kunming, China Martin Knytl , Charles University, Viničná, Czech Republic Comments on this article All Comments (0) Add a comment Sign up for content alerts Sign Up You are now signed up to receive this alert Browse by related subjects keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2025 Knytl M. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 16 Jun 2025 | for Version 1 Martin Knytl , Charles University, Viničná, Czech Republic 0 Views copyright © 2025 Knytl M. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (0) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions The proposed manuscript “Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog (Litoria verreauxii alpina)” presents a valuable de-novo genome assembly at the scaffold level for this threatened species. One of the key fundings is the mapping of over 90% of reads to the 13 largest scaffolds, leading the authors to propose these to represent 13 chromosomes in the karyotype of L. v. alpina. The manuscript contributes to genomics, offering a usable and reproducible resource - the genome assembly is already deposited in the NCBI database. I found no fundamental issues within the proposed manuscript. It is technically sound and written in high-quality English. Furthermore, all methods and results pertaining to the genome and transcriptome analyses are presented with clarity, and the text is well-structured, creating a coherent narrative. I have only minor comments/questions to further enhance the manuscript's clarity: 1) Species Description: The introduction could benefit from a more detailed description of the species L. v. alpina. Specifically, including its taxonomic classification (e.g., the family level, batrachia subgroup) and relevant phylogenetic context would be valuable for readers less familiar with this organism. 2) Scaffold Count and Chromosome Number: The authors propose that the 13 largest scaffolds likely represent the 13 chromosomes. However, Table 3 indicates an L90 of 12 scaffolds. Clarification would be beneficial as to whether the L90 value of 12 scaffolds has any bearing on the chromosomal count (and if Table 3 might have a typo), or if it's an independent assembly metric. Are the rationale for sequencing the genome and the species significance clearly described? Yes Are the protocols appropriate and is the work technically sound? Yes Are sufficient details of the sequencing and extraction, software used, and materials provided to allow replication by others? Yes Are the datasets clearly presented in a usable and accessible format, and the assembly and annotation available in an appropriate subject-specific repository? Yes Competing Interests No competing interests were disclosed. Reviewer Expertise Chromosome evolution, Sex chromosomes, Polyploidy, Cytogenetics, Evolutionary genomics, Sanger sequencing, Genome editing, Cytogenomics I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (0) Knytl M. Peer Review Report For: Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] . F1000Research 2025, 14 :514 ( https://doi.org/10.5256/f1000research.180093.r387736) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/14-514/v1#referee-response-387736 keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2025 Sun Y. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 06 Jun 2025 | for Version 1 Yanbo Sun , Yunnan University, Kunming, China 0 Views copyright © 2025 Sun Y. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (1) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Summary of the Article The study presents the first reference genome (2.77 Gb) and a reproduction-focused transcriptome for the threatened alpine tree frog (Litoria verreauxii alpina), a species endemic to the Australian Alps. The genome was assembled using PacBio HiFi reads (31.74× coverage) and scaffolded with Omni-C proximity ligation data. Transcriptomes were generated from brain, liver, and gonad tissues of male and female frogs. The genome assembly yielded 774 scaffolds with a scaffold N50 of 267.09 Mb, and annotation predicted 40,092 genes. The work aims to support conservation efforts by elucidating genetic mechanisms behind the species' compensatory reproductive strategy, which offsets high mortality from chytridiomycosis. While data accessibility and rationale are exemplary, methodological opacity and technical inconsistencies must be resolved to ensure replicability and scientific rigor. Insufficient parameter details: Assembly tools (e.g., hifiasm, minimap2, purge_dups) lack runtime parameters, k-mer sizes, or filtering thresholds. BUSCO vs. Merqury discrepancy: The genome completeness dropped from 100% (pre-purge) to 78.6% (post-purge) in Merqury, while BUSCO reported 90.1%. Authors must reconcile this by analyzing purged sequences (e.g., whether critical genes were removed). Software versions are provided (e.g., hifiasm v0.16.1), but critical parameters (e.g., --purge-dups thresholds, Hi-C scaffolding stringency) are omitted. RNA-Seq trimming parameters are noted, but adapter sequences and quality-filtering cutoffs are not specified. Ethical permit details lack a link to institutional guidelines or approval documentation. Are the rationale for sequencing the genome and the species significance clearly described? Yes Are the protocols appropriate and is the work technically sound? Partly Are sufficient details of the sequencing and extraction, software used, and materials provided to allow replication by others? Partly Are the datasets clearly presented in a usable and accessible format, and the assembly and annotation available in an appropriate subject-specific repository? Yes Competing Interests No competing interests were disclosed. Reviewer Expertise Evolutionary genomics of amphibians and reptiles I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (1) Author Response 02 Sep 2025 Alexander Wendt, Department of Veterinary Sciences, The University of Melbourne Faculty of Science, Werribee, 3030, Australia We found that the default parameters within the Galaxy workflows for assembly (e.g., hifiasm, minimap2, purge_dups) were sufficient for our assembly, and adjusting these parameters made no noticeable difference to the final output (several test runs with other parameters were performed). Specifically: hifiasm : default -l 44, -m 97, hifiasm determines k-mer sizes automatically during assembly, based on the input read characteristics (such as read length and coverage). No explicit k-mer sizes were set in our workflow. minimap2 : default -N 5, -F 800, -f 0.0002, -g 5000, -r 500, -n 3, -m 40, -p 0.8, purge_dups : default thresholds YaHS Hi-C scaffolding : default settings, including: Mapping quality threshold (-q): 10 Contig and scaffold error correction: both enabled by default. These default settings provided moderate stringency, balancing accuracy and scaffold continuity. We chose to retain these default parameters to ensure easy reproduction of the workflows and minimize potential biases from over-optimization. These parameters are also associated with the version of the workflow and can be referenced accordingly. We thank the reviewer for highlighting this point and are happy to provide these details here to improve transparency. While genome completeness measured by Merqury dropped from 100% to 78.6% post-purge, the BUSCO score remained unchanged. This discrepancy likely reflects the high repetitive content typical of amphibian genomes, as these repetitive elements and high copy-number regions are over represented during initial sequencing and are more susceptible to removal during purging. In contrast, BUSCO targets single-copy orthologs, which remain stable regardless of repeat content. Scaffold 1 was mainly affected during the purging of duplicates and the genome was reduced by 5,074,743 bp. For RNA-Seq trimming, this was specified in the manuscript: Trimmomatic Galaxy v0.36.6 was used to trim reads specifying NEXTERA (pair-ended) adapters, SLIDING-WINDOW:4:5, LEADING:5, TRAILING:5, and MINLEN:25 Regarding the ethical permit details, we have submitted the official approval letter to the journal during the manuscript submission process. While this letter is not intended for public dissemination, it has already been vetted by the journal’s editorial office. Once again, we thank the reviewer for their thoughtful comments and for highlighting these areas for clarification. We believe these additional details will strengthen the manuscript and improve transparency for future readers View more View less Competing Interests There are no competing interests reply Respond Report a concern Sun Y. Peer Review Report For: Reference genome and reproduction-focused transcriptome for the threatened alpine tree frog ( Litoria verreauxii alpina ) [version 2; peer review: 2 approved] . F1000Research 2025, 14 :514 ( https://doi.org/10.5256/f1000research.180093.r387730) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/14-514/v1#referee-response-387730 Alongside their report, reviewers assign a status to the article: Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions Adjust parameters to alter display View on desktop for interactive features Includes Interactive Elements View on desktop for interactive features Competing Interests Policy Provide sufficient details of any financial or non-financial competing interests to enable users to assess whether your comments might lead a reasonable person to question your impartiality. 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