多焦点,多现象型瘤是由早期胚胎发生过程中获得的MTOR突变引起的
Clarissa N Pacyna1, Madhanagopal Anandapadamanaban2, Kevin W Loudon3,4
1Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge, CB10 1SA, UK.
早期胚胎突变可能导致儿科瘤. 在四种同步瘤中,一个共享的MTOR突变源自单个胚胎细胞,影响mTORC1/mTORC2活动并指导治疗决策.
科学领域:
- 发育生物学是发展生物学.
- 癌症基因组学 癌症基因组学
- 分子瘤学分子瘤学
背景情况:
- 胚胎生成是一个关键的发育时期,突变可以导致广泛的疾病易感细胞.
- 儿科瘤通常是由早期发育错误引起的,但它们的确切起源和遗传驱动因素可能很难确定.
- 了解同步瘤的进化轨迹对于有效的临床管理至关重要.
研究的目的:
- 为了研究儿童患者同步瘤的进化史和分子基础.
- 为了确定胚胎发生过程中的原始细胞和瘤发作的时间.
- 描述共享突变对关键细胞通路的功能影响.
主要方法:
- 同步脏瘤的全基因组测序.
- 单细胞和批量转录组测序.
- 遗传学重建以确定瘤的进化史.
- 鉴定突变的生物化学和结构分析.
主要成果:
- 遗传学分析追溯了四种同步瘤的起源,追溯到怀孕后大约4周左右右中的单个多能胚胎细胞.
- 在所有瘤中都发现了MTOR基因的共同突变,而在正常组织中则不存在.
- 证明MTOR突变增强了蛋白质的灵活性,导致mTORC1和mTORC2信号通路的活性显著增加.
- 这种突变通常不会被标准的遗传查方法检测出来.
结论:
- 发育突变,即使是那些无法通过常规查检测的突变,在儿科瘤形成中也发挥着关键作用.
- 鉴定的MTOR突变通过调节mTORC1/mTORC2信号的失调来驱动瘤发生.
- 描述儿科瘤的进化史和分子基础对于预后,向治疗和家庭查至关重要.
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