表观遗传学分析揭示了关键的超级增强器网络,这些网络驱动HPV阳性HNSCC的瘤发生
Fernando T Zamuner1, Spencer S Chan2,3, Michael D Kessler4,5
1Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
人类乳头瘤病毒阳性头支状细胞癌 (HPV+ HNSCC) 呈现出独特的表观遗传失调. 以BRD4抑制为目标的超级增强剂通过抑制瘤性途径显示出治疗潜力.
科学领域:
- 在瘤学瘤学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 人类乳头瘤病毒阳性 (HPV+) 头角状细胞癌 (HNSCC) 是一种独特的癌症亚型.
- 与HPV阴性HNSCC相比,HPV+HNSCC的特点是较少的遗传突变和显著的表观遗传失调.
研究的目的:
- 在HPV+ HNSCC中映射H3K27ac标记的超级增强剂 (SE).
- 识别瘤特异性SE域 (T-SED) 和相关的转录因子 (TF).
- 调查针对HPV+HNSCC中SE驱动的转录的治疗潜力.
主要方法:
- 染色体免疫沉测序 (ChIP-seq) 用于在患者衍生异体移植 (PDX) 和正常的口腔膜中映射H3K27ac标记的SE.
- RNA测序 (RNA-seq) 用于分析增强型RNA和mRNA的表达.
- 使用JQ1.1.进行BRD4的药理抑制.
主要成果:
- 鉴定了针对TP63,FOSL1和JUND等TF富含的瘤特异性SE域 (T-SED).
- 证明了与SE相关的TFs调节了关键的致癌途径.
- 表明BRD4与JQ1的抑制降低了这些TFs的调节,并抑制了瘤特异性途径,包括上皮-介质酶过渡和E2F标.
- 在T-SEDs附近观察到增强器RNA和mRNA的协调失调.
结论:
- 超级增强剂在HPV+ HNSCC的表观遗传和转录失调中发挥着至关重要的作用.
- 针对SE驱动的转录,特别是通过BRD4抑制,对HPV+HNSCC具有治疗前景.
- 这项研究为未来对HPV+ HNSCC中SE的机制性研究提供了框架.
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