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减数分裂同源染色体重组交换的改变在男性不育发生中的作用

Alteration in meiotic recombination in human male infertility

  • 摘要: 在第一次减数分裂前期,同源染色体之间需进行配对、联会和遗传物质的重组交换等一系列重要事件.重组交换对染色体正确分离、配子正常形成至关重要.重组交换改变可导致不同程度的精子异常,如精子发生停滞而出现不育,或精子染色体异常导致非整倍体出现.而不育症是一个世界性的问题,影响着10%~15%夫妇,由男方因素所引起的占一半,其中多数病因和机制不明,关于因减数分裂错误导致精子发生失败的机制仍知之甚少.近年来发展的荧光免疫遗传学技术可直视减数分裂前期的重要事件,为研究人类精子形成的调节提供了开拓性的进展.本文围绕重组交换与精子发生之间的关系综述了在这个领域内的研究进展.

     

    Abstract: During the prophase of meiosis I, homologous chromosomes pair, synapse and exchange genetic materials (recombination). Meiotic recombination plays a crucial role in the proper segregation of homologous chromosomes and normal gametogenesis. Altered recombination may lead to various sperm abnormalities, such as arrest in spermatogenesis or non-disjunction, which in turn contributes to infertility or aneuploidy. Infertility is a major health problem that affects 10%~15% of couples, about half of which being attributed to male factors in which the aetiology and mechanisms are unidentified. Despite the obvious clinical significance and high incidence of human male infertility, the mechanisms of spermatogenic failure caused by meiotic recombination errors in humans has been inadequately unclear. However, recently-developed immunofluorescence methods which can directly view meiotic recombination and associated important events during gametogenesis have revolutionized our understanding of human spermatogenesis. In this paper, the relationship between meiotic recombination and spermatogenesis is reviewed.

     

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