Whole‐genome assembly and annotation for the little yellow croaker (Larimichthys polyactis) provide insights into the evolution of hermaphroditism and gonochorism

• DOI: 10.1111/1755-0998.13731
• Publication Date: 2022-11-04T07:35:10Z
• Authors: Qing‐Ping Xie; Wei Zhan; Jian‐Zhi Shi; Feng Liu; Bao‐Long Niu; Xue He; Meng Liu; Jing Wang; Qi‐Qi Liang; Yue Xie; Peng Xu; Xu Wang; Bao Lou
• Keywords: Hermaphrodite; Phylogenomics

The evolutionary direction of gonochorism and hermaphroditism is an intriguing mystery to be solved. special transient hermaphroditic stage makes the little yellow croaker (Larimichthys polyactis) appealing model for studying hermaphrodite formation. However, origin relationship between L. polyactis Larimichthys crocea, most famous commercial fish species in East Asia, remain unclear. Here, we report sequence genome, which found ~706 Mb long (contig N50 = 1.21 scaffold 4.52 Mb) contains 25,233 protein-coding genes. Phylogenomic analysis suggested that diverged from common ancestor, approximately 25.4 million years ago. Our high-quality genome assembly enabled comparative genomic analysis, revealed several within-chromosome rearrangements translocations, without major chromosome fission or fusion events two species. dmrt1 gene was identified as male-specific polyactis. Transcriptome showed expression its upstream regulatory (rnf183) were both sexually dimorphic. Rnf183, unlike paralogues rnf223 rnf225, only present Lates but not other teleost species, suggesting it originated lineage-specific duplication lost teleosts. Phylogenetic shows male may explained by evolution dmrt1. Decoding provides insight into genetic underpinnings evolution, also valuable information enhancing aquaculture.