大发HCII类交换激活器CIITA是淋巴细胞癌中经常出现的基因融合合作伙伴
Christian Steidl1, Sohrab P Shah, Bruce W Woolcock
1Department of Pathology and Laboratory Medicine, Centre for Lymphoid Cancers and the Centre for Translational and Applied Genomics, Vancouver, British Columbia, V5Z4E6, Canada.
Nature
|March 4, 2011
概括
在霍奇金淋巴瘤和原发性中间体B细胞淋巴瘤中发现了涉及CIITA基因的复发性基因融合. 这些CIITA变化影响瘤-免疫相互作用和患者的存活率,这表明淋巴状癌症中存在一种新的机制.
科学领域:
- 血液学 血液学 血液学
- 分子生物学分子生物学
- 在瘤学瘤学.
背景情况:
- 染色体转位是B细胞淋巴瘤发病的关键驱动因素,定义了亚型.
- 一些淋巴瘤缺乏疾病定义的转位,需要进一步调查.
研究的目的:
- 在霍奇金淋巴瘤和相关的B细胞淋巴瘤中识别新的融合转录和转位事件.
- 研究CIITA基因在这些癌症的分子格局和临床结果中的作用.
主要方法:
- 霍奇金淋巴瘤细胞系的全转录组对结尾测序 (RNA-seq).
- 在263种原发性B细胞淋巴瘤中对CIITA基因重组的基因组评估.
- 分析CIITA融合对HLAII类表达和PD-1配体水平的影响.
主要成果:
- 在KM-H2细胞中发现了一种涉及CIITA (MHC2TA) 基因的新型,高度表达的基因融合.
- 基因组 CIITA 断裂在原发性中间体B细胞淋巴瘤 (38%) 和古典霍奇金淋巴瘤 (15%) 中是复发性的.
- CIITA的变化会影响原发性中性B细胞淋巴瘤的存活率,并导致HLAII类表达减少和PD-L1/PD-L2.2增加.
结论:
- 经常发生的CIITA重组代表了淋巴细胞癌的新型遗传机制.
- CIITA 融合通过调节 HLA II 类和 PD-1 带表达来改变瘤免疫相互作用.
- CIITA的变化与临床结果有关,特别是在原发性中间体B细胞淋巴瘤中.
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