RAD21L, a novel cohesin subunit implicated in linking homologous chromosomes in mammalian meiosis.

RAD21L, a novel cohesin subunit implicated in linking homologous chromosomes in mammalian meiosis.
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DOI:
10.1083/jcb.201008005
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发表时间:
2011-01-24
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Hirano T
Hirano T
中科院分区:
其他
文献类型:
--
作者:
Lee J;Hirano T

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减数分裂特异的kleisin cohesin亚基,RAD 21 L,可能参与突触的启动和同源染色体之间的交叉重组。凝聚素是一种多亚基蛋白复合物,在有丝分裂和减数分裂过程中调节姐妹染色单体的凝聚。在这里,我们确定了一个新的kleisin亚基的凝聚素,RAD 21 L,这是保守的脊椎动物。在小鼠中,RAD 21 L仅在减数分裂早期表达:它显然在减数分裂前S期取代RAD 21,在细线期的轴向元件上变得可检测到,并且停留在轴向/侧向元件上直到粗线期中期。RAD 21 L随后消失,并被RAD 21取代。RAD 21 L的这种行为是独特的,并且不同于另一个减数分裂特异性克莱辛亚基REC 8的行为。值得注意的是,RAD 21 L在粗线期中期的消失与DNA双链断裂修复的完成和交叉的形成相关,如通过与分子标记γ-H2 AX、MSH 4和MLH 1的共标记所判断的。RAD 21 L与SMC 3、STAG 3以及SMC 1 α或SMC 1 β相关。我们的研究结果表明,含有RAD 21 L的粘着蛋白复合物可能参与突触的启动和同源染色体之间的交叉重组。
The meiosis-specific kleisin cohesin subunit, RAD21L, may participate in synapsis initiation and crossover recombination between homologous chromosomes. Cohesins are multi-subunit protein complexes that regulate sister chromatid cohesion during mitosis and meiosis. Here we identified a novel kleisin subunit of cohesins, RAD21L, which is conserved among vertebrates. In mice, RAD21L is expressed exclusively in early meiosis: it apparently replaces RAD21 in premeiotic S phase, becomes detectable on the axial elements in leptotene, and stays on the axial/lateral elements until mid pachytene. RAD21L then disappears, and is replaced with RAD21. This behavior of RAD21L is unique and distinct from that of REC8, another meiosis-specific kleisin subunit. Remarkably, the disappearance of RAD21L at mid pachytene correlates with the completion of DNA double-strand break repair and the formation of crossovers as judged by colabeling with molecular markers, γ-H2AX, MSH4, and MLH1. RAD21L associates with SMC3, STAG3, and either SMC1α or SMC1β. Our results suggest that cohesin complexes containing RAD21L may be involved in synapsis initiation and crossover recombination between homologous chromosomes.
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