生物
七鳃鳗
基因组
Hox基因
进化生物学
谱系(遗传)
遗传学
转座因子
基因
古生物学
转录因子
作者
Ting Zhu,Yongxin Li,Yue Pang,Yinglun Han,Jun Li,Zhongkai Wang,Xin Liu,Haorong Li,Yishan Hua,Hui Jiang,Hongming Teng,Jian Quan,Yu Liu,Ming Geng,Meiao Li,Fan Hui,Jinzhao Liu,Qiang Qiu,Qingwei Li,Yandong Ren
标识
DOI:10.1111/1755-0998.13279
摘要
Abstract The reissner lamprey Lethenteron reissneri , belonging to the class Cyclostomata, serves as a bridge between invertebrates and jawed vertebrates, and is considered the sister group of jawed vertebrates. However, despite this evolutionary significance, the genetic mechanisms underlying the adaptive evolution of the lamprey lineage remain unclear. Here, we assembled a 1.06 Gb chromosome‐level draft genome of L. reissneri , with 72 chromosomes (ranging in length from 4.5 Mb to 25.9 Mb) and a scaffold N50 length of 13.23 Mb. Genome quality comparisons revealed that the reissner lamprey genome has higher completeness and contiguity than the previously published sea lamprey and Japanese lamprey genomes. Moreover, reissner lamprey, sea lamprey, and Japanese lamprey species share similar transposable element profiles and Hox gene cluster compositions, suggesting that a burst of transposable element activity and whole genome duplication occurred before their divergence. Additionally, the Lip gene copy numbers, which have been studied for their functions in the host defence system, were found to be expanded uniquely in lamprey lineages, suggesting key roles for these genes in lamprey evolution and adaptation. We also identified two neural‐related genes, Nrn1 and Unc13a , with copy number expansions in jawed vertebrates, which may be functionally relevant to the origin of lamprey brains. Hence, this study not only provides the first chromosome‐level reference genome for Cyclostomata, but also highlights features of the unique biology and adaptive evolution of the lamprey lineage.
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