在MADD中,一个拼接部位变异影响胰腺β细胞和垂体淋巴细胞中的激素表达
Kristiina Pulli1, Jonna Saarimäki-Vire1, Pekka Ahonen1
1Stem Cells and Metabolism Research Program (STEMM), Research Programs Unit, Faculty of Medicine, and.
JCI insight
|May 22, 2024
概括
在MAPK激活死亡域 (MADD) 基因中的遗传变异会导致复杂的内分泌疾病. 一个特定的MADD异构体30的缺失会损害胰岛素和黄化激素的产生,影响多个器官系统.
科学领域:
- 遗传学和分子生物学
- 内分泌学 在内分泌学.
- 细胞生物学 细胞生物学
背景情况:
- MAPK激活死亡域 (MADD) 蛋白调节GTPases,MAPK信号和细胞存活.
- MADD基因多态性与血糖特征有关.
- 双性MADD变异会导致影响多个器官系统的复杂综合征.
研究的目的:
- 调查由MADD变种引起的类内分泌表型背后的分子机制.
- 阐明MADD外因子30在胰腺β细胞和垂体性腺体内激素调节中的作用.
主要方法:
- 在受影响的兄弟姐妹中识别MADD中的同卵性拼接部位变异.
- 用MADD异构30删除 (dex30) 来生成细胞模型.
- 对胰腺小岛和β细胞系进行胰岛素生产分析.
- 评估淋巴细胞细胞系对黄素化激素的表达.
- 评估野生类型和dex30 MADD的蛋白质-蛋白质相互作用.
主要成果:
- 一种同卵性MADD拼接部位变异导致30号外显子跳转和氨基酸删除.
- dex30胰腺小岛显示β细胞数量减少,胰岛素含量降低,亲胰岛素与胰岛素比率发生变化.
- dex30人类β细胞表现出胰岛素表达的降低.
- dex30小鼠的淋巴细胞表现出减少的黄素化激素表达.
- MADD dex30表现出改变的蛋白相互作用,但保留了GDP/GTP交换活动.
结论:
- 特定于MADD的过程对于调节胰腺β细胞中的激素表达至关重要.
- MADD在 pituitary gonadotropes 中调节激素表达方面发挥着作用.
- 鉴定到的MADD变体通过破坏激素调节,导致复杂的内分泌综合征.
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