Letter to the Editor regarding "Long-read genome sequencing provides novel insights into the harmful algal bloom species Prymnesium parvum" by Jian et al. (2024)

2026 · doi:10.64898/2026.01.21.699772
preprint OA: closed CC-BY-ND-4.0
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This Letter to the Editor reanalyzes the study by Jian et al. (2024), which reported de novo long-read genome assemblies for two strains of the harmful algal bloom species Prymnesium parvum (sensu lato). The authors present evidence that Jian et al. inadvertently swapped the labels for UTEX 2797 and CCMP 3037, meaning the “UTEX 2797” sequence data correspond to CCMP 3037 and vice versa, and they emphasize that misidentification is a major risk for cryptic species complexes. They argue that the reanalysis highlights the need for clade-specific markers to support accurate and efficient strain identification. 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

Jian et al. (2024) describe de novo genome assemblies for two strains of Prymnesium parvum (sensu lato, s.l.), a cryptic species complex of toxic, unicellular algae responsible for harmful algal blooms around the world. Here, we present evidence that the labels for UTEX 2797 and CCMP 3037 were inadvertently swapped by Jian et al. (2024). This resulted in sequence data labeled "UTEX 2797" but derived from strain CCMP 3037, and vice versa. Strain misidentification is a major risk with cryptic species like P. parvum s.l., and our reanalysis of the data in Jian et al. (2024) underscores the urgent need for clade-specific markers to ensure accurate and efficient strain identification.
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Abstract Jian et al. (2024) describe de novo genome assemblies for two strains of Prymnesium parvum (sensu lato, s.l.), a cryptic species complex of toxic, unicellular algae responsible for harmful algal blooms around the world. Here, we present evidence that the labels for UTEX 2797 and CCMP 3037 were inadvertently swapped by Jian et al. (2024). This resulted in sequence data labeled “UTEX 2797” but derived from strain CCMP 3037, and vice versa. Strain misidentification is a major risk with cryptic species like P. parvum s.l., and our reanalysis of the data in Jian et al. (2024) underscores the urgent need for clade-specific markers to ensure accurate and efficient strain identification. Competing Interest Statement The authors have declared no competing interest. Copyright The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-ND 4.0 International license.

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