The sequence of a male-specific genome region containing the sex determination switch in Aedes aegypti

The sequence of a male-specific genome region containing the sex determination switch in Aedes aegypti
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埃及伊蚊中含有性别决定开关的雄性特异性基因组区域的序列

DOI:
10.1101/122804
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发表时间:
2017
期刊:
--
影响因子:
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通讯作者:
Turner J
Turner J
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作者:
Turner J

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研究背景埃及伊蚊是几种重要虫媒病毒的主要传播媒介。限制疾病传播的病媒控制方法之一是遗传策略,其中涉及释放不育或转基因的非叮咬雄性,这引起了人们对操纵蚊子性别比例的兴趣。 Ae 中的性别决定。埃及伊蚊由称为 M 基因座的非重组 Y 染色体样区域控制,但该基因座的表征因基因组的重复性质而受到阻碍。 2015 年,一个名为 Nix 的 M 位点基因被鉴定出,它显示出性别决定开关的特性。结果通过使用全基因组细菌人工染色体 (BAC) 文库,我们扩增并测序了包含雄性决定基因 Nix 的约 200 kb 区域。在这项研究中,我们证明 Nixi 由两个外显子组成,这两个外显子被一个 99 kb 内含子分隔开,内含子主要由重复 DNA,尤其是转座元件组成。结论 Nixi 是一个异常大且高度重复的基因,表现出与其他生物体中 Y 染色体基因相同的特征。根据提出的昆虫性染色体进化模型,我们推测 M 基因座缺乏重组使得重复序列以性别限制染色体特有的方式扩展。
BackgroundAedes aegyptiis the principal vector of several important arboviruses. Among the methods of vector control to limit transmission of disease are genetic strategies that involve the release of sterile or genetically modified non-biting males, which has generated interest in manipulating mosquito sex ratios. Sex determination inAe. aegyptiis controlled by a non-recombining Y chromosome-like region called the M locus, yet characterisation of this locus has been thwarted by the repetitive nature of the genome. In 2015, an M locus gene namedNixwas identified that displays the qualities of a sex determination switch.ResultsWith the use of a whole-genome bacterial artificial chromosome (BAC) library, we amplified and sequenced a ~200 kb region containing the male-determining geneNix. In this study, we show thatNixis comprised of two exons separated by a 99 kb intron primarily composed of repetitive DNA, especially transposable elements.ConclusionsNix, an unusually large and highly repetitive gene, exhibits features in common with Y chromosome genes in other organisms. We speculate that the lack of recombination at the M locus has allowed the expansion of repeats in a manner characteristic of a sex-limited chromosome, in accordance with proposed models of sex chromosome evolution in insects.
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