ISL1 (E283D) 的Missense突变与2型糖尿病的发展有关
Juan Zhang1,2, Rong Zhang1, Chanwei Liu1
1Shanghai Diabetes Institute, Department of Endocrinology & Metabolism, Shanghai Key Clinical Center for Metabolic Disease, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Diabetologia
|May 31, 2024
概括
发现ISL1基因 (胰岛素增强剂结合蛋白岛-1) 的新奇突变会损害胰岛素分泌,并导致葡萄糖不耐受. 这项研究强调ISL1作为2型糖尿病的潜在治疗点.
科学领域:
- 内分泌学 在内分泌学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 编码胰岛素增强剂结合蛋白岛-1 (ISL1) 的ISL1基因突变与2型糖尿病 (T2DM) 中胰岛素分泌减弱有关.
- 了解ISL1突变对T2DM病原体产生贡献的精确机制对于开发向疗法至关重要.
研究的目的:
- 调查与T2DM相关的特定ISL1突变 (E283D) 的致病机制.
- 创建和表征一种Isl1E283D诺金 (KI) 鼠标模型,以研究其对葡萄糖平衡和胰岛素分泌的影响.
主要方法:
- 整体外基因组测序确定了T2DM家族中的ISL1E283D突变.
- 一个Isl1E283D KI小鼠模型被生成用于体内研究,包括葡萄糖耐受性和胰岛素耐受性测试.
- 对孤立的小岛和INS-1细胞的研究评估了葡萄糖刺激胰岛素分泌 (GSIS),基因表达 (Ins2,Mafa,Pdx1,Slc2a2,NeuroD1) 和ISL1的转录活性.
主要成果:
- Isl1E283D KI小鼠表现出GSIS受损和血糖水平升高的情况.
- 在KI小鼠群岛中观察到Ins2和其他ISL1基因 (Mafa,Pdx1,Slc2a2) 和相互作用蛋白NeuroD1的下调.
- 这种Isl1E283D突变显著降低了ISL1在Ins2上的转录活性,导致Ins2表达的减少.
结论:
- Isl1E283D突变通过影响基因和相互作用蛋白质,损害胰岛素的表达和分泌,导致小鼠的葡萄糖不耐受.
- 这项研究确定Isl1E283D突变是T2DM的新型致病因子,重复了人类糖尿病表型.
- 向转录因子ISL1为T2DM提供了一个有前途的治疗策略.
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