通过BCL11A直接抑制,控制胎儿对成人血红蛋白的切换
Nan Liu1, Victoria V Hargreaves1, Qian Zhu2
1Cancer and Blood Disorders Center, Dana Farber Cancer Institute and Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.
Cell
|April 3, 2018
概括
BCL11A直接抑制胎儿血红蛋白 (HbF) 基因表达,导致转换为成人血红蛋白 (HbA). 这种机制涉及γ-环球蛋白促进体中的特定DNA基因,对于调节环球蛋白基因切换至关重要.
科学领域:
- 遗传学
- 分子生物学
- 血液学
背景情况:
- 胎儿血红蛋白 (HbF) 水平在遗传上影响成人血红蛋白疾病的严重程度,如状细胞疾病和β-血症.
- BCL11A是从胎儿血红蛋白 (γ- 全球蛋白) 转化为成人血红蛋白 (β- 全球蛋白) 的关键调节剂.
研究的目的:
- 阐明BCL11A通过何种机制调解从γ-环球蛋白转变为β-环球蛋白表达.
- 确定参与BCL11A介导的γ-全球基因抑制的特定DNA序列和蛋白质域.
主要方法:
- 用功能测定和蛋白质结合微阵列来确定BCL11A的DNA识别序列和功能域.
- 使用CUT&RUN测定来绘制红色素细胞中的BCL11A结合部位.
- 使用促进剂编辑来评估对BCL11A结合和基因表达的影响.
主要成果:
- 在BCL11A中的指集群对于抑制γ- 全球蛋白基因表达至关重要.
- 在胚胎和胎儿的全球蛋白促进体中发现了由BCL11A识别的特定DNA基因,特别是在γ-全球蛋白促进体中复制.
- BCL11A优先与γ- 格洛宾促进体的远端动机结合,并且破坏这种结合会影响基因表达.
结论:
- 血红蛋白开关的基本机制是BCL11A直接抑制γ- 全球蛋白基因促进体.
- 了解这种BCL11A介导的抑制,为血红蛋白病提供了潜在的治疗点.
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