首页> 中文期刊> 《动物学研究》 >Dynamic evolution of transposable elements,demographic history,and gene content of paleognathous birds

Dynamic evolution of transposable elements,demographic history,and gene content of paleognathous birds

         

摘要

Palaeognathae includes ratite and tinamou species that are important for understanding early avian evolution.Here,we analyzed the whole-genome sequences of 15 paleognathous species to infer their demographic histories,which are presently unknown.We found that most species showed a reduction of population size since the beginning of the last glacial period,except for those species distributed in Australasia and in the far south of South America.Different degrees of contraction and expansion of transposable elements(TE)have shaped the paleognathous genome architecture,with a higher transposon removal rate in tinamous than in ratites.One repeat family,AviRTE,likely underwent horizontal transfer from tropical parasites to the ancestor of little and undulated tinamous about 30 million years ago.Our analysis of gene families identified rapid turnover of immune and reproductionrelated genes but found no evidence of gene family changes underlying the convergent evolution of flightlessness among ratites.We also found that mitochondrial genes have experienced a faster evolutionary rate in tinamous than in ratites,with the former also showing more degenerated W chromosomes.This result can be explained by the Hill-Robertson interference affecting genetically linked W chromosomes and mitochondria.Overall,we reconstructed the evolutionary history of the Palaeognathae populations,genes,and TEs.Our findings of co-evolution between mitochondria and W chromosomes highlight the key difference in genome evolution between species with ZW sex chromosomes and those with XY sex chromosomes.

著录项

  • 来源
    《动物学研究》 |2021年第1期|51-61|共11页
  • 作者单位

    Institute of Animal Sex and Development;

    Zhejiang Wanli University;

    Ningbo;

    Zhejiang 315100;

    China;

    MOE Laboratory of Biosystems Homeostasis&Protection;

    Life Sciences Institute;

    Zhejiang University;

    Hangzhou;

    Zhejiang 310058;

    China;

    Department of Neuroscience and Developmental Biology;

    University of Vienna;

    Vienna 1090;

    Austria;

    BGI-Shenzhen;

    Beishan Industrial Zone;

    Shenzhen;

    Guangdong 518083;

    China;

    State Key Laboratory of Genetic Resources and Evolution;

    Kunming Institute of Zoology;

    Chinese Academy of Sciences;

    Kunming;

    Yunnan 650223;

    China;

    Section for Ecology and Evolution;

    Department of Biology;

    University of Copenhagen;

    Copenhagen DK-2100;

    Denmark;

    Center for Excellence in Animal Evolution and Genetics;

    Chinese Academy of Sciences;

    Kunming;

    Yunnan 650223;

    China;

    Center for Reproductive Medicine;

    The Second Affiliated Hospital;

    School of Medicine;

    Zhejiang University;

    Hangzhou;

    Zhejiang 310058;

    China;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 基因工程(遗传工程);
  • 关键词

    Paleognaths; Demographic history; Transposable elements; Gene families; Mitochondria;

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