Heterogeneous Histories of Recombination Suppression on Stickleback Sex Chromosomes.
Heterogeneous Histories of Recombination Suppression on Stickleback Sex Chromosomes.
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DOI：
10.1093/molbev/msab179
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发表时间：
2021-09-27
影响因子：
10.7
通讯作者：
Kirkpatrick M
中科院分区：
文献类型：
--
作者：
Sardell JM;Josephson MP;Dalziel AC;Peichel CL;Kirkpatrick M
性染色体形成后不久的进化轨迹有多一致？通过比较具有同源性染色体的近缘物种，可以深入了解重组、分化和退化的进化过程。本文报道了三棘鱼（Gasterosteus aculeatus）及其姊妹种日本海棘鱼（G. nipponicus），已经被很好地表征。然而，人们对它们的同类--黑斑棘鱼的性染色体却知之甚少。wheatlandi）。我们使用系谱获得实验阶段的全基因组序列从黑斑刺鱼X和Y染色体。使用多物种基因树和分析共享的重复，我们证明，19号染色体是祖先的性染色体，它的最古老的地层进化的共同祖先的属。在黑斑鱼分化后，其性染色体经历了独立的和更广泛的重组抑制，更大的X-Y分化，和更高的Y退化率比其他两个物种。这些模式可能是由于黑斑棘鱼的有效种群规模较小。最近，祖先黑斑棘鱼Y染色体和12号染色体之间的融合产生了新X和新Y，这可能是由于祖先性染色体上重组区域的尺寸非常小。我们确定了祖先和新性别染色体上的六个层次，其中X和Y之间的重组在不同的时间停止。这些结果证实，性染色体可以在很短的进化时间尺度内进化出物种内部和物种之间的巨大差异。
How consistent are the evolutionary trajectories of sex chromosomes shortly after they form? Insights into the evolution of recombination, differentiation, and degeneration can be provided by comparing closely related species with homologous sex chromosomes. The sex chromosomes of the threespine stickleback (Gasterosteus aculeatus) and its sister species, the Japan Sea stickleback (G. nipponicus), have been well characterized. Little is known, however, about the sex chromosomes of their congener, the blackspotted stickleback (G. wheatlandi). We used pedigrees to obtain experimentally phased whole genome sequences from blackspotted stickleback X and Y chromosomes. Using multispecies gene trees and analysis of shared duplications, we demonstrate that Chromosome 19 is the ancestral sex chromosome and that its oldest stratum evolved in the common ancestor of the genus. After the blackspotted lineage diverged, its sex chromosomes experienced independent and more extensive recombination suppression, greater X–Y differentiation, and a much higher rate of Y degeneration than the other two species. These patterns may result from a smaller effective population size in the blackspotted stickleback. A recent fusion between the ancestral blackspotted stickleback Y chromosome and Chromosome 12, which produced a neo-X and neo-Y, may have been favored by the very small size of the recombining region on the ancestral sex chromosome. We identify six strata on the ancestral and neo-sex chromosomes where recombination between the X and Y ceased at different times. These results confirm that sex chromosomes can evolve large differences within and between species over short evolutionary timescales.
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DOI：
10.1111/evo.12792
发表时间：
2015-11
期刊：
Evolution; international journal of organic evolution
影响因子：
--
作者：
Blackmon H;Hardy NB;Ross L
通讯作者：
Ross L
影响因子：
16.6
作者：
Jeffries DL;Lavanchy G;Sermier R;Sredl MJ;Miura I;Borzée A;Barrow LN;Canestrelli D;Crochet PA;Dufresnes C;Fu J;Ma WJ;Garcia CM;Ghali K;Nicieza AG;O'Donnell RP;Rodrigues N;Romano A;Martínez-Solano Í;Stepanyan I;Zumbach S;Brelsford A;Perrin N
通讯作者：
Perrin N
影响因子：
3.9
作者：
Goto, Hiroki;Peng, Lei;Makova, Kateryna D.
通讯作者：
Makova, Kateryna D.
影响因子：
3.3
作者：
Handley, LL;Ceplitis, H;Ellegren, H
通讯作者：
Ellegren, H
使用下一代 DNA 测序数据进行变异发现和基因分型的框架。
影响因子：
30.8
作者：
通讯作者：
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