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CELL:组蛋白和PDGFRA双重突变促进胶质瘤发生

2020-12-04 haibei MedSci原创

高级胶质瘤(HGGs)是致命的原发性脑肿瘤,是儿童和青少年死亡的主要原因。这些肿瘤经常携带编码组蛋白3(H3)变异的基因的体性突变或表观遗传修饰物,具有显著的神经解剖学和年龄特异性。

高级胶质瘤(HGGs)是致命的原发性脑肿瘤,是儿童和青少年死亡的主要原因。这些肿瘤经常携带编码组蛋白3(H3)变异的基因的体性突变或表观遗传修饰物,具有显著的神经解剖学和年龄特异性。青少年和年轻成年人(12-35岁)的HGGs主要发生在大脑半球叶,大量的HGGs被认为是表观遗传病。这些HGGs中超过30%的HGGs带有非规范的H3.3变体的杂合突变,导致甘氨酸34转精氨酸或缬氨酸(G34R/V)的氨基酸替换。

G34R/V肿瘤研究不足,很可能被低估,因为其独特的组织病理学异质性,神经元-胶质双区存在程度不一,导致误诊。事实上,近30%的中枢神经系统原始神经外胚层肿瘤(CNS-PNETs),即现在已经过时的混合性高等级神经元肿瘤实体,已被证明是G34R/V突变型HGGs。

另一方面,在分子水平上,G34R/V HGGs表现出统一的特征;它们几乎无一例外地携带α地中海贫血/智力低下综合征X-linked(ATRX)和肿瘤蛋白p53(TP53)的突变,缺乏少突胶质标记OLIG2的免疫反应性,并基于DNA甲基化与其他胶质瘤实体区别开来。

最近,研究人员在CELL杂志发文表明,50%的G34R/V肿瘤(n = 95)具有激活的PDGFRA突变,在复发时显示出强大的选择压力。虽然被认为是胶质瘤,但G34R/V肿瘤实际上产生于GSX2/DLX表达的中间神经元祖细胞中,G34R/V突变损害了神经元的分化。

起源系可能通过连接PDGFRA与GSX2调控元件的染色质环促进PDGFRA的共同选择,促进PDGFRA过度表达和突变。

在单细胞水平上,G34R/V肿瘤具有神经元/星形胶质双重身份,缺乏少突胶质特征,被GSX2/DLX介导的细胞命运规范主动抑制。G34R/V在肿瘤维持中可能成为可有可无的存在,而突变体PDGFRA是强效致癌的。

总的来说,该结果为致命性肿瘤开辟了一条新的研究途径。G34R/V胶质瘤是神经元恶性肿瘤,其中中间神经元前体细胞因G34R/V突变而分化停滞,而恶性胶质的发生是通过共同选择一个潜在的可靶向途径PDGFRA信号来促进的。

 

原始出处:

Carol C.L. Chen et al. Histone H3.3G34-Mutant Interneuron Progenitors Co-opt PDGFRA for Gliomagenesis. CELL (2020). 

 

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    2021-11-05 维他命
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    2021-01-14 tpa

    学习了,谢谢

    0

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    2020-12-06 xqptu
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    2020-12-06 liuyiping
  6. [GetPortalCommentsPageByObjectIdResponse(id=1962385, encodeId=ec7319623852f, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=95, 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=Fri Nov 05 02:24:52 CST 2021, time=2021-11-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1872083, encodeId=95c818e208370, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=107, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Thu May 20 09:24:52 CST 2021, time=2021-05-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=916449, encodeId=c01b91644925, content=学习了,谢谢, beContent=null, objectType=article, channel=null, level=null, likeNumber=202, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20201118/19b1dfaff0be456a90b1197fa733f5a2/6dd57bbc99234f65a0075a0d11caad75.jpg, createdBy=ef8d2073772, createdName=tpa, createdTime=Thu Jan 14 10:16:50 CST 2021, time=2021-01-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1384710, encodeId=328b1384e10ba, content=<a href='/topic/show?id=5c74e7739f0' target=_blank style='color:#2F92EE;'>#组蛋白#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=117, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=77739, encryptionId=5c74e7739f0, topicName=组蛋白)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=ea13490, createdName=xqptu, createdTime=Sun Dec 06 10:24:52 CST 2020, time=2020-12-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1534524, encodeId=c7611534524f4, content=<a href='/topic/show?id=22b3e9887e' target=_blank style='color:#2F92EE;'>#GFR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=83, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=7988, encryptionId=22b3e9887e, topicName=GFR)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0a812532020, createdName=liuyiping, createdTime=Sun Dec 06 10:24:52 CST 2020, time=2020-12-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=904993, encodeId=2f44904993a2, content=努力学习<a href='/topic/show?id=23e3454e353' target=_blank style='color:#2F92EE;'>#学习#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=206, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=45473, encryptionId=23e3454e353, topicName=学习)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=43905113801, createdName=1461f038m76暂无昵称, createdTime=Fri Dec 04 22:24:03 CST 2020, time=2020-12-04, status=1, ipAttribution=)]
    2020-12-04 1461f038m76暂无昵称

    努力学习#学习#

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