2026-10-09T06:15:42Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33829522 2026-09-16T06:15:07Z category_23971 category_24439 item_type_3 month_year_09_2026

Genome assembly and annotation files of the earthworm eel Nagaichthys filipes Wanchang Zhang (8086700) Fish physiology and genetics Vertebrate biology Genome assembly, annotation comparative genomics and evolution <p dir="ltr">The earthworm eel <i>Nagaichthys filipes</i> (family Chaudhuriidae, order Synbranchiformes) is a miniaturized fish endemic to the acidic, hypoxic peat swamp blackwaters of Southeast Asia, yet no genomic resource exists for this lineage. Here we present a telomere-to-telomere (T2T), chromosome-level assembly in which all 12 chromosomes are gap-free and capped by complete telomeres, the first such genome for Synbranchiformes. The 450.43 Mb assembly reaches 95.5% BUSCO completeness and encodes 23,281 protein-coding genes. Concordant genome-scale and mitochondrial phylogenies resolve Chaudhuriidae as sister to Mastacembelidae and clarify relationships among the major percomorph series. Notably, expanded gene families and 147 positively selected genes are independently enriched for DNA repair pathways, implicating reinforced genome maintenance in adaptation to peat swamps. Comparative synteny attributes the doubled chromosome number of <i>Mastacembelus armatus</i> to 12 Robertsonian fissions rather than whole-genome duplication. Together, these results establish a foundation for studying earthworm eel systematics and adaptive evolution.</p> 2026-09-16T06:15:07Z Dataset Dataset 10.6084/m9.figshare.33829522.v1 https://figshare.com/articles/dataset/Genome_assembly_and_annotation_files_of_the_earthworm_eel_Nagaichthys_filipes/33829522 CC BY 4.0