Chromosomally-retained RNA mediates homologous pairing.

Chromosomally-retained RNA mediates homologous pairing.
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DOI:
10.4161/nucl.22732
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发表时间:
2012-11
期刊:
Nucleus (Austin, Tex.)
影响因子:
--
通讯作者:
Hiraoka Y
Hiraoka Y
中科院分区:
其他
文献类型:
--
作者:
Ding DQ;Haraguchi T;Hiraoka Y

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同源染色体的配对和重组对于确保减数分裂中染色体的正确分离至关重要。在粟酒裂殖酵母中,染色体首先在端粒处成束(形成端粒花束),然后通过细长“马尾”核的振荡运动进行排列(图 1)。端粒聚类和随后的染色体排列促进同源染色体的配对。然而,这种端粒捆绑的染色体排列不能解释染色体配对的特异性。因此,必须有某种机制来促进端粒聚类后同源伴侣的识别。最近对粟酒裂殖酵母的研究表明,保留在染色体上的 RNA 转录本或 RNA 体可能在识别同源染色体配对方面发挥作用(图 1)。作为同源位点的基准标记,它们将消除直接 DNA 序列同源性搜索的需要。
Pairing and recombination of homologous chromosomes are essential for ensuring correct segregation of chromosomes in meiosis. In S. pombe, chromosomes are first bundled at the telomeres (forming a telomere bouquet) and then aligned by oscillatory movement of the elongated “horsetail” nucleus (Fig. 1). Telomere clustering and subsequent chromosome alignment promote pairing of homologous chromosomes. However, this telomere-bundled alignment of chromosomes cannot be responsible for the specificity of chromosome pairing. Thus, there must be some mechanism to facilitate recognition of homologous partners after telomere clustering. Recent studies in S. pombe have shown that RNA transcripts retained on the chromosome, or RNA bodies, may play a role in recognition of homologous chromosomes for pairing (Fig. 1). Acting as fiducial markers of homologous loci they would abrogate the need for direct DNA sequence homology searching.
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