Blood:通过抑制PAPD5调节TERC的转录后修饰可恢复角化不良患者的终末造血

2019-02-07 MedSci MedSci原创

中心点:抑制PAPD5可稳定TERC,恢复X染色体连锁的角化障碍的人胚胎干细胞的端粒酶并延长端粒长度。调节PAPD5可改善携带病理性突变的角化不良患者的胚胎干细胞的终末造血发育。摘要:TERC(端粒酶RNA的组成成分)水平降低可导致携带TERC、PARN、NOP10、NHP2、NAF1或DKC1突变的患者发生角化障碍(DC)。抑制非经典poly(A)聚合酶PAPD5或外泌体RNA降解复合物,可部分

中心点:

抑制PAPD5可稳定TERC,恢复X染色体连锁的角化障碍的人胚胎干细胞的端粒酶并延长端粒长度。

调节PAPD5可改善携带病理性突变的角化不良患者的胚胎干细胞的终末造血发育。

摘要:

TERC(端粒酶RNA的组成成分)水平降低可导致携带TERC、PARN、NOP10、NHP2、NAF1或DKC1突变的患者发生角化障碍(DC)。抑制非经典poly(A)聚合酶PAPD5或外泌体RNA降解复合物,可部分恢复DKC1突变细胞的TERC水平,但仍不明确TERC的转录后加工的调控是否可改善角化障碍患者的造血输出。

Wilson Chun Fok等人采用一种携带常见角化不良蛋白突变(DKC1_A353V,该突变可导致端粒酶维持功能缺陷和终末造血潜能降低)的人胚胎干细胞(hESCs),来研究EXOSC3活性降低或PAPD5介导的寡腺苷化沉默对DC患者造血祖细胞功能的影响。

DKC1突变型hESCs的EXOSC3或PAPD5水平降低可功能性改善TERC水平和端粒酶活性,并伴随端粒延长和DNA损伤信号的降低。沉默PAPD5,可明显恢复DKC1突变细胞的终末造血潜能,但沉默EXOSC3无此效果。此外,研究人员还发现在分化的CD34+细胞中,PAPD5的抑制作用是持续的,伴随成熟的、功能性的TERC形成增多,提示上调PAPD5可能是逆转DC患者造血功能障碍的一种潜在策略。


原始出处:

Wilson Chun Fok, et al. Posttranscriptional modulation of TERC by PAPD5 inhibition rescues hematopoietic development in dyskeratosis congenita. Blood 2019 :blood-2018-11-885368; doi: https://doi.org/10.1182/blood-2018-11-885368 

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  2. [GetPortalCommentsPageByObjectIdResponse(id=2030168, encodeId=7a8c2030168ae, content=<a href='/topic/show?id=d88913e2636' target=_blank style='color:#2F92EE;'>#PAP#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13726, encryptionId=d88913e2636, topicName=PAP)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=82ba2500166, createdName=ms1467340776200723, createdTime=Thu Jun 27 00:29:00 CST 2019, time=2019-06-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1747342, encodeId=6b3c1e47342e3, content=<a href='/topic/show?id=832e93345c3' target=_blank style='color:#2F92EE;'>#转录#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=93345, encryptionId=832e93345c3, topicName=转录)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=58df35929710, createdName=mjldent, createdTime=Mon Jan 20 03:29:00 CST 2020, time=2020-01-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1494661, encodeId=e20514946610f, content=<a href='/topic/show?id=084d9499599' target=_blank style='color:#2F92EE;'>#造血#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=22, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=94995, encryptionId=084d9499599, topicName=造血)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=caed9138962, createdName=俅侠, createdTime=Sat Feb 09 02:29:00 CST 2019, time=2019-02-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1569346, encodeId=817815693467e, content=<a href='/topic/show?id=1c562e42646' target=_blank style='color:#2F92EE;'>#修饰#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=27426, encryptionId=1c562e42646, topicName=修饰)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=29c615505859, createdName=zhangyxzsh, createdTime=Sat Feb 09 02:29:00 CST 2019, time=2019-02-09, status=1, ipAttribution=)]
    2020-01-20 mjldent
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    2019-02-09 俅侠
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    2019-02-09 zhangyxzsh