在患有婴儿肝功能障碍的患者中,对新型和复发的RINT1变异进行功能分析
Taiga Aoki1,2, Ayano Inui3, Yoshiyasu Ogata4
1Department of Genome Medicine, National Center for Child Health and Development, Tokyo, Japan.
在RINT1的致病变体引起肝病通过破坏内细胞网膜 (ER) 连接,损害自,并激活未折叠的蛋白质反应 (UPR). 这导致肝脏肥胖症,纤维化和脂质代谢异常.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 肝病学 肝病学是一种肝病学.
背景情况:
- 与Rad50相互作用的蛋白质 (RINT1) 对膜贩运和脂质代谢至关重要,与ER连接和SNARE复合体相互作用.
- 功能丧失的RINT1变体与偶发性透视膜炎,骨发育不良或性有关.
研究的目的:
- 研究由RINT1变种引起的肝病背后的分子机制.
- 在患者和模型系统中描述已识别的RINT1变异的功能后果.
主要方法:
- 三个全外基因组测序以识别患者的病原变异.
- 免疫沉以评估蛋白质相互作用.
- 定量PCR (qPCR) 用于分析基因表达.
- 自流量测试 (LC3-II周转率).
- 在体内功能研究的Drosophila melanogaster模型.
主要成果:
- 两名患有复发性透氨炎,凝血病和高氨血的非相关患者被发现具有双的致病性RINT1变体.
- 突变的RINT1蛋白质表现出破坏的ER tether和SNARE相互作用.
- RINT1功能障碍激活了未折叠的蛋白质反应 (UPR) 和受损的自流.
- 果虫模型显示组织缩和减少脂肪体中的脂质滴.
结论:
- 失去RINT1功能通过UPR激活,自衰竭和脂质储存异常,有助于肝脏疾病的发病.
- RINT1变种破坏了基本的细胞过程,导致严重的肝脏表现.
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