Cell Death Dis:NBS1与HP1相互作用保护基因组的完整性

2020-02-01 QQY MedSci原创

HP1(异染色质蛋白1)和MRN(Mre11-Rad50-Nbs1)复合物都是保守因子,对基因组的稳定性和完整性具有重要作用。虽然从染色质组织、端粒维护到DNA复制及修复,HP1与MRN复合物的功能有所重叠,但它们之间功能的相关性仍未明确。本研究发现果蝇中的HP1a蛋白科通过MRN复合物的chromoshadow结构域(CSD)与其结合。此外,MRN复合物的任一成员丢失均会降低HP1a的水平,说明

HP1(异染色质蛋白1)和MRN(Mre11-Rad50-Nbs1)复合物都是保守因子,对基因组的稳定性和完整性具有重要作用。虽然从染色质组织、端粒维护到DNA复制及修复,HP1与MRN复合物的功能有所重叠,但它们之间功能的相关性仍未明确。

本研究发现果蝇中的HP1a蛋白科通过MRN复合物的chromoshadow结构域(CSD)与其结合。此外,MRN复合物的任一成员丢失均会降低HP1a的水平,说明MRN复合物可能是影响HP1a稳定性的一种调节剂。

HPb1a在nbs突变细胞中过表达会大大减少了Nbs缺失引起的DNA损伤,表明HP1a与Nbs可协同作用维持果蝇染色体的完整性。研究人员还发现,人源HP1α与NBS1也具有相互作用,且与果蝇相似的,siRNA介导的NBS1抑制可降低人培养细胞的HP1α表达水平。

令人意外的是,在Nijmege断裂综合症(NBS)患者来源的成纤维细胞中发现,携带NBS1基因657del5亚型突变并能够表达NBS1蛋白p26和p70截断片段的细胞能够积累HP1α蛋白,该发现与NBS1基因敲除细胞的结果不同,说明截短NBS1能够提高HP1α的表达和/或增强其稳定性。

值得注意的是,在NBS成纤维细胞中,采用siRNA敲低HP1α的表达能够降低其对辐射的超敏性。

综上,该研究证明了HP1和NBS1之间紧密的相互作用对于基因组的稳定性至关重要,HP1α可能是抵消NBS患者细胞染色体不稳定的一个潜在靶标。

原始出处:

Bosso et al. NBS1 interacts with HP1 to ensure genome integrity.Cell Death and Disease (2019) 10:951.https://doi.org/10.1038/s41419-019-2185-x

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    2020-03-15 维他命
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  6. [GetPortalCommentsPageByObjectIdResponse(id=1871554, encodeId=1c4d18e15547c, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=25, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Mon Mar 30 21:15:00 CST 2020, time=2020-03-30, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1685385, encodeId=fb7e168538569, content=<a href='/topic/show?id=e2661256225' target=_blank style='color:#2F92EE;'>#NBS1#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=36, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12562, encryptionId=e2661256225, topicName=NBS1)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=489c28161048, createdName=xiaoyang_ambs, createdTime=Thu May 07 07:15:00 CST 2020, time=2020-05-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1961845, encodeId=6c5719618450c, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=23, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Sun Mar 15 07:15:00 CST 2020, time=2020-03-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2006735, encodeId=f03f2006e3512, content=<a href='/topic/show?id=99ff45888bc' target=_blank style='color:#2F92EE;'>#完整性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=45888, encryptionId=99ff45888bc, topicName=完整性)], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTIOca9icPByKxo3ZRUrvuibf7tWt7EScQ1NEiaKy4NCUctSU2jDjOayLicDIaicwUxaQhJ1SZKdEevgjRg/132, createdBy=4f272500131, createdName=若水123, createdTime=Tue Sep 01 06:15:00 CST 2020, time=2020-09-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1909293, encodeId=8bbf190929388, content=<a href='/topic/show?id=8039e2512e8' target=_blank style='color:#2F92EE;'>#相互作用#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=72512, encryptionId=8039e2512e8, topicName=相互作用)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f73a255, createdName=medscijoin, createdTime=Sun Mar 01 00:15:00 CST 2020, time=2020-03-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2013158, encodeId=a8d22013158f8, content=<a href='/topic/show?id=7d69598468' target=_blank style='color:#2F92EE;'>#Dis#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=30, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5984, encryptionId=7d69598468, topicName=Dis)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c689267, createdName=cmj8wellington, createdTime=Wed May 06 21:15:00 CST 2020, time=2020-05-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1471651, encodeId=6e5914e1651b7, content=<a href='/topic/show?id=c0132410554' target=_blank style='color:#2F92EE;'>#互作#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=24105, encryptionId=c0132410554, topicName=互作)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4dc87121468, createdName=ylz8405, createdTime=Mon Feb 03 06:15:00 CST 2020, time=2020-02-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1531517, encodeId=d466153151ee6, content=<a href='/topic/show?id=770e5e9457' target=_blank style='color:#2F92EE;'>#Death#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5794, encryptionId=770e5e9457, topicName=Death)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=32e312278742, createdName=cy0328, createdTime=Mon Feb 03 06:15:00 CST 2020, time=2020-02-03, status=1, ipAttribution=)]
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    2020-02-03 ylz8405
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