2026-10-11T20:38:05Z https://api.figshare.com/v2/oai

oai:figshare.com:article/30944231 2026-09-23T09:30:57Z category_24310 item_type_3 month_year_09_2026

Telomere-to-telomere gapless genome assemblies of Coreius heterodon and Coreius guichenoti Ying Bai (22909982) Genomics Coreius heterodon Coreius guichenoti Genome assembly Genome annotation <p dir="ltr"><i>Coreius heterodon</i> and <i>Coreius guichenoti</i> are endemic cyprinid fishes of the upper Yangtze River Basin. <i>C. guichenoti</i> is classified as Endangered (EN) by the IUCN and listed as a national second-class protected wild animal in China, whereas <i>C. heterodon</i> is classified as Not Evaluated (NE) by the IUCN. However, genomic resources for these species have remained limited, constraining evolutionary and conservation genetic studies. Here, we present near telomere-to-telomere genome assemblies for both species. The assemblies span 1.09 Gb for <i>Coreius heterodon</i> and 1.08 Gb for <i>Coreius guichenoti</i>, with contig N50 values of 43.10 Mb and 42.62 Mb, respectively, and are anchored to 25 chromosomes. Repetitive elements account for approximately 58% of each genome, and 25,876 and 25,778 protein-coding genes were annotated, respectively. Both assemblies exhibit exceptional completeness, with BUSCO scores exceeding 98.9%, confirming their high quality and reliability. Phylogenomic analyses based on single-copy orthologs resolved the placement of <i>Coreius</i> within <i>Gobioninae</i> and estimated that the two species diverged approximately 21 million years ago. Comparative analyses revealed lineage-specific gene family evolution and positive selection, mainly related to reproduction, immunity, and hormone pathways. These genome assemblies provide high-resolution resources for future studies on genome evolution, adaptive diversification, and conservation genomics of endemic fishes in the Yangtze River Basin<i>.</i></p> 2026-03-08T03:58:19Z Dataset Dataset 10.6084/m9.figshare.30944231.v2 https://figshare.com/articles/dataset/Telomere-to-telomere_genome_assemblies_of_i_Coreius_heterodon_i_and_i_i_i_Coreius_guichenoti_i_/30944231 CC BY 4.0