Genome Biology:吉林大学崔久嵬等揭示表观遗传驱动肿瘤转移的新机制

2018-12-13 郑博豪 iNature

2018年12月11日,吉林大学第一医院干细胞与癌症中心崔久嵬等人在期刊Genome Biology发表题为A novel FLI1 exoniccircular RNA promotes metastasis in breast cancer by coordinately regulatingTET1 and DNMT1的高水平文章。该文章发现:FLI1除了通过经典的癌蛋白途径转移,还通过使用

2018年12月11日,吉林大学第一医院干细胞与癌症中心崔久嵬等人在期刊Genome Biology发表题为A novel FLI1 exoniccircular RNA promotes metastasis in breast cancer by coordinately regulatingTET1 and DNMT1的高水平文章。该文章发现:FLI1除了通过经典的癌蛋白途径转移,还通过使用由其外显子环状RNA介导的表观遗传机制来驱动肿瘤转移。

FLI1(Friend leukemia virus integration 1)是ETS转录因子家族的一员,在血液系统恶性肿瘤中起着致癌驱动因子的作用,并促进实体肿瘤的生长。然而,关于在肿瘤中激活这种原癌基因的机制知之甚少。转录因子的ETS基因家族有一个共同的ETSDNA结合域,负责靶启动子上的序列特异性DNA识别,并且它们在控制细胞增殖,转化,凋亡和肿瘤发生中起关键作用。


一种新的FLI 1外显子环状RNA

在ETS家族成员中,FLI1首先被鉴定为由F-MuLV诱导的红白血病中的原病毒整合激活的原癌基因。 FLI1优先在造血细胞和组织中表达,调节造血干细胞的自我更新和分化。 FLI1的异常表达可能是血液系统恶性肿瘤发展的关键驱动因素。 FLI1在成红细胞中的过表达导致分化的抑制并最终导致前T细胞淋巴母细胞白血病/淋巴瘤的发展。除红白血病外,异常失调的FLI1还与其他血液系统恶性肿瘤有关,包括前T细胞淋巴母细胞淋巴瘤,急性髓性白血病和B细胞淋巴瘤。


形成FLI1外显子环状RNA

为了确定FLI1在乳腺癌中的作用,实验人员首先检查了它在乳腺癌患者中的表达。使用免疫组织化学染色,发现与邻近的正常组织相比:FLI1在乳腺肿瘤组织中被显着激活。 在与转移相关的乳腺癌组织中也存在相对高的FLI1表达!

这些数据表明:FECR1环状RNA通过对DNA甲基化和去甲基化酶的调节,从而作为上游调节剂来控制乳腺癌肿瘤生长。因此:FLI1除了通过经典的癌蛋白途径转移,还通过使用由其外显子环状RNA介导的表观遗传机制来驱动肿瘤转移。

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