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首页> 外文期刊>Genome >Microsatellite accumulation on the Y chromosome in Silene latifolia.
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Microsatellite accumulation on the Y chromosome in Silene latifolia.

机译：阔叶银叶草Y染色体上的微卫星积累。

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摘要

The dioecious plant Silene latifolia possesses evolutionarily young sex chromosomes, and so serves as a model system to study the early stages of sex chromosome evolution. Sex chromosomes often differ distinctly from autosomes in both their structure and their patterns of evolution. The S. latifolia Y chromosome is particularly unique owing to its large size, which contrasts with the size of smaller, degenerate mammalian Y chromosomes. It is thought that the suppression of recombination on the S. latifolia Y chromosome could have resulted in the accumulation of repetitive sequences that account for its large size. Here we used fluorescence in situ hybridization (FISH) to study the chromosomal distribution of various microsatellites in S. latifolia including all possible mono-, di-, and tri-nucleotides. Our results demonstrate that a majority of microsatellites are accumulated on the q arm of the Y chromosome, which stopped recombining relatively recently and has had less time to accumulate repetitive DNA sequences compared with the p arm. Based on these results we can speculate that microsatellites have accumulated in regions that predate the genome expansion, supporting the view that the accumulation of repetitive DNA sequences occurred prior to, not because of, the degeneration of genes.
机译：雌雄异株植物Silene latifolia具有进化上的年轻性染色体，因此可作为研究性染色体进化早期的模型系统。性染色体在结构和进化方式上通常与常染色体明显不同。阔叶葡萄球菌Y染色体由于其较大的大小而特别独特，这与较小的简并的哺乳动物Y染色体的大小形成对比。据认为，对S. latifolia Y染色体上重组的抑制可能导致重复序列的积累，这是其大尺寸的原因。在这里，我们使用荧光原位杂交（FISH）研究了阔叶链球菌中各种微卫星的染色体分布，包括所有可能的单核苷酸，二核苷酸和三核苷酸。我们的结果表明，大多数微卫星聚集在Y染色体的q臂上，与p臂相比，它在最近停止了重组，并且累积重复DNA序列的时间更少。根据这些结果，我们可以推测微卫星已经聚集在基因组扩展之前的区域，这支持了重复DNA序列的积累是在基因退化之前而不是由于基因退化而发生的观点。

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