在SLC30A8位点的多个遗传变异会影响当地的超强增强剂活性,并影响胰腺β细胞的存活和功能
Ming Hu1, Innah Kim1, Ignasi Morán2
1Section of Cell Biology and Functional Genomics, Division of Diabetes, Endocrinology and Metabolism, Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London, UK.
接近SLC30A8基因的遗传变异会影响2型糖尿病 (T2D) 的风险. 增强剂在β细胞中的删除减少了SLC30A8表达和改善了胰岛素分泌,这表明它在已知的R325W变异之外发挥了作用.
科学领域:
- 遗传学和基因组学 遗传学和基因组学
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
背景情况:
- SLC30A8位点的变异与2型糖尿病 (T2D) 风险有关,Arg325Trp (R325W) 误解变异是主要关注点.
- 新出现的证据表明,改变的SLC30A8mRNA表达,而不仅仅是编码变体,有助于T2D风险.
- 在SLC30A8附近确定了一个小岛选择性增强剂集群,其中包含与T2D风险和异位基因特异性表达相关的变体.
研究的目的:
- 为了研究影响SLC30A8等位基特异性表达 (ASE) 的多种变异在小岛增强器集群中的作用.
- 确定删除这些增强子区域对SLC30A8表达和β细胞功能的功能影响.
- 探索增强剂活性对邻近基因的更广泛影响及其对T2D的潜在贡献.
主要方法:
- 利用CRISPR-Cas9基因编辑来删除人类EndoC-βH3细胞中携带变异的增强器区域.
- 评估SLC30A8和邻近基因表达水平的变化.
- 评估了这些遗传修饰对葡萄糖刺激胰岛素分泌和β细胞活力的影响.
主要成果:
- 删除增强剂区域显著降低了SLC30A8的表达,并改善了葡萄糖刺激的胰岛素分泌.
- 单独对SLC30A8的下调并没有影响β细胞存活率,但UTP23,RAD21或MED30的丧失降低了细胞活力.
- 转录调节剂JQ1降低了多个基因在位的表达,并增强了刺激胰岛素分泌.
结论:
- 在SLC30A8增强剂集群中的非编码变体在调节基因表达和β细胞功能方面发挥着至关重要的作用.
- 这些发现扩大了对T2D病原体的理解,超越了R325W编码变体,涉及监管要素.
- 针对这些增强剂或相关的调节途径可能为2型糖尿病提供新的治疗策略.
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