Phased Potato Genome Assembly and Association Genetics Enable Characterisation of the Elusive H1 Resistance Locus Against Potato Cyst Nematodes

2025 · doi:10.1101/2025.08.04.667887
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This study generated a phased genome assembly of the H1 resistance locus from a dihaploid potato line, enabling the characterization of its complete structure and association with resistance to potato cyst nematodes.

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⚙ AI-generated deep summary by claude@2026-07, 2026-07-16 · read from full text ⓘ

The study focused on resolving the genomic structure of the potato H1 resistance locus, previously mapped to chromosome 5 but not fully characterized due to potato’s complex tetrasomic inheritance and the locus’s clustered paralog/allele structure. The authors created a dihaploid line (DH4_Athlete) carrying the H1 introgression and used Oxford Nanopore sequencing to generate a phased haplotype representation of the H1 interval, then applied RenSeq-based association genetics to reconstruct the entire locus and identify recombination points at both the 5′ and 3′ ends. A key limitation is that the work relies on a specific engineered dihaploid background and reconstructs the locus structure within that genomic context rather than across diverse potato germplasm. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

The complexity of potato genetics, characterised by tetrasomic inheritance, has contributed to slower genetic gain in potato compared to other major crops. Disease resistance genes, often found in large clusters of highly similar paralogs and alleles, further complicate genetic studies. The H1 resistance locus, introgressed into potato cultivars from Solanum tuberosum spp. andigena , has been successfully used for over 60 years to control Globodera rostochiensis in Europe. Although previous genetic studies mapped this resistance to chromosome 5, the complete structure of the locus remained elusive. To reduce genomic complexity, we generated a dihaploid of the cultivar ‘Athlete’, DH4_Athlete, carrying the H1 resistance locus, and produced a phased haplotype representation of the H1 interval using Oxford Nanopore sequencing. Combined with RenSeq-based association genetics, this approach allowed us to reconstruct the entire H1 locus, including recombination points at both the 5′ and 3′ ends of the interval.
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Abstract The complexity of potato genetics, characterised by tetrasomic inheritance, has contributed to slower genetic gain in potato compared to other major crops. Disease resistance genes, often found in large clusters of highly similar paralogs and alleles, further complicate genetic studies. The H1 resistance locus, introgressed into potato cultivars from Solanum tuberosum spp. andigena, has been successfully used for over 60 years to control Globodera rostochiensis in Europe. Although previous genetic studies mapped this resistance to chromosome 5, the complete structure of the locus remained elusive. To reduce genomic complexity, we generated a dihaploid of the cultivar ‘Athlete’, DH4_Athlete, carrying the H1 resistance locus, and produced a phased haplotype representation of the H1 interval using Oxford Nanopore sequencing. Combined with RenSeq-based association genetics, this approach allowed us to reconstruct the entire H1 locus, including recombination points at both the 5′ and 3′ ends of the interval. Competing Interest Statement The authors have declared no competing interest.

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