Synaptonemal complex protein SYCP3 impairs mitotic recombination by interfering with BRCA2.

Synaptonemal complex protein SYCP3 impairs mitotic recombination by interfering with BRCA2.
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DOI:
10.1038/embor.2011.221
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发表时间:
2011-12-23
期刊:
影响因子:
7.7
通讯作者:
Miyagawa, Kiyoshi
Miyagawa, Kiyoshi
中科院分区:
生物学2区
文献类型:
--
作者:
Hosoya, Noriko;Okajima, Miyuki;Kinomura, Aiko;Fujii, Yoshihiro;Hiyama, Takashi;Sun, Jiying;Tashiro, Satoshi;Miyagawa, Kiyoshi

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据报道,减数分裂特异性突触复合体蛋白SYCP3在肿瘤中异常表达。然而,与它在减数分裂中明确的功能相反,它在有丝分裂细胞中的可能作用是完全未知的。在这里,我们发现SYCP3在一系列原发肿瘤中表达,并损害有丝分裂细胞的染色体完整性。SYCP3的表达抑制由RAD51介导的同源重组(HR)途径,诱导对dna损伤剂如聚(adp -核糖)聚合酶(PARP)抑制剂的超敏反应和染色体不稳定性。SYCP3与BRCA2形成复合物并抑制其在HR中的作用。这些发现强调了癌症中染色体不稳定的新机制,并将parp抑制剂敏感肿瘤的范围扩大到表达SYCP3的肿瘤。
The meiosis-specific synaptonemal complex protein SYCP3 has been reported to be aberrantly expressed in tumours. However, in contrast to its well-defined function in meiosis, its possible role in mitotic cells is entirely unknown. Here, we show that SYCP3 is expressed in a range of primary tumours and that it impairs chromosomal integrity in mitotic cells. Expression of SYCP3 inhibits the homologous recombination (HR) pathway mediated by RAD51, inducing hypersensitivity to DNA-damaging agents such as a poly(ADP-ribose) polymerase (PARP) inhibitor and chromosomal instability. SYCP3 forms a complex with BRCA2 and inhibits its role in HR. These findings highlight a new mechanism for chromosomal instability in cancer and extend the range of PARP-inhibitor sensitive tumours to those expressing SYCP3.
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发表时间: 2009-09-01
期刊: EMBO REPORTS
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