Evolution of Sex Determination and Sex Chromosomes: A Novel Alternative Paradigm
Evolution of Sex Determination and Sex Chromosomes: A Novel Alternative Paradigm
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DOI：
10.1002/bies.201900212
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发表时间：
2020-07-10
期刊：
影响因子：
4
通讯作者：
Meisel, Richard P.
中科院分区：
文献类型：
--
作者：
Meisel, Richard P.
性染色体可以在物种之间不同，这是进化更替的结果，这一过程可以由性别决定途径的进化驱动。性染色体转换的典型模型假设一个新的性别决定主基因导致常染色体变成性染色体或XY染色体对变成ZW染色体对（反之亦然）。在这里，性别决定和性染色体的进化提出了一个新的范例，其中有一个主性别决定进化过渡，但X染色体保持不变。有三个记录的新范例的例子，并假设类似的过程可能发生在ZW性染色体系统。其他三个类群也确定了新的范例可能发生的地方，以及如何可以区分这些和其他类群的典型轨迹。
Sex chromosomes can differ between species as a result of evolutionary turnover, a process that can be driven by evolution of the sex determination pathway. Canonical models of sex chromosome turnover hypothesize that a new master sex determining gene causes an autosome to become a sex chromosome or an XY chromosome pair to switch to a ZW pair (or vice versa). Here, a novel paradigm for the evolution of sex determination and sex chromosomes is presented, in which there is an evolutionary transition in the master sex determiner, but the X chromosome remains unchanged. There are three documented examples of the novel paradigm, and it is hypothesized that a similar process could happen in a ZW sex chromosome system. Three other taxa are also identified where the novel paradigm may have occurred, and how it could be distinguished from canonical trajectories in these and additional taxa is also described.