葡萄糖皮质体受体基因的新奇无意义突变导致葡萄糖皮质体耐药性与不孕症
Jiangyun Lei1, Yue Wang1, Ying Song1
1Department of Endocrinology, Sichuan-Chongqing Joint Key Laboratory of Metabolic Vascular Diseases, Chongqing Key Laboratory of Translational Medicine in Major Metabolic Diseases, the First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
在克鲁索斯综合征中,一种新的NR3C1基因突变导致葡萄糖皮质体受体 (GR) 敏感性降低. 丸中STUB1的低表达可能通过增加GR Y613*积累来解释不孕症.
科学领域:
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 克鲁索斯综合征是一种罕见的遗传疾病,由NR3C1基因的失活突变引起,该基因编码人类葡萄糖皮质体受体 (GR).
- 这项研究集中在一个患有克鲁索斯综合征的男性患者身上,该患者表现为寡精子和不孕症,缺乏其他典型的临床特征.
研究的目的:
- 为了研究一个患有Chrousos综合征的病人独特的临床表现,特别是不孕不育背后的分子机制.
- 阐明一种新的NR3C1突变 (c.1839T>A,p.Tyr613Ter) 如何影响葡萄糖皮质体受体 (GR) 功能和表达.
主要方法:
- 将突变的GR等离子体转化为HEK293T和HeLa细胞,以评估葡萄糖皮质体敏感性和GR表达.
- 利用蛋白质组分析和细胞实验来确定由突变引起的GR表达变化的背后机制.
主要成果:
- 鉴定到的突变 (GR Y613*) 导致GR联体结合区域的删除,导致对德克萨米他的亲和力降低,核转位减少,并损害了交换活性.
- GR Y613*表现出蛋白质水平降低,但基因表达不变,E3结合酶STUB1被确定为其无素-蛋白酶降解的调节者.
- 发现STUB1的表达在人类丸和塞尔托利细胞中明显低于其他组织.
结论:
- 这种GR Y613*突变使得对葡萄糖皮质类药物的敏感性降低.
- STUB1促进了突变GR Y613*的无处不在和降解.
- 丸中STUB1的低表达可能会导致GR Y613*的积累,这可能解释了这位克鲁索斯综合征患者观察到的不孕症.
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