フックス角膜内皮変性症におけるCTGリピート伸長の役割解明

阐明 CTG 重复扩增在 Fuchs 角膜内皮变性中的作用

• 批准号: 21J12608
• 负责人: CHEN LI WEI
• 金额: $ 0.96万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-28 至 2023-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21J12608/
• 关键词: Fuchs dystrophy; genome editing; trinucleotide repeats; Fuchs’ dystrophy; CRISPR/Cas9

Fuchs endothelial corneal dystrophy is a degenerative disease of the cornea that is commonly associated with TGC repeat expansion in the TCF4 gene. In this project, CRISPR/Cas9 genome editing was used to produce TCF4 gene TGC repeat excision or expansion in cultured human corneal endothelial cells to examine the possible effects of TGC repeats and the surrounding region. Edited cells of different TGC repeat lengths were found to have no significant difference in gross morphology and cell proliferation rates. Transcriptomic and proteomic analyses found differentially expressed mRNAs and proteins that pointed to RNA splicing, ER stress, mitochondrial turnover, ferroptosis, epithelial cell differentiation and changes in the estrogen signaling pathway as possible mechanisms for the development of disease in Fuchs endothelial corneal dystrophy with TGC repeat expansion. The cell line with TGC repeat expansion was found to have RNA foci with RNA FISH and several novel TCF4 mRNA isoforms with long-read capture RNA-sequencing. CRISPR-related genome editing was also attempted in mice using different approaches, although a successful mouse model with TCF4 gene TGC repeat expansion has yet to be generated.

Fuchs内皮性角膜营养不良是一种角膜退行性疾病，通常与TCF4基因的TGC重复扩增有关。本项目利用CRISPR/Cas9基因组编辑技术，在培养的人角膜内皮细胞中产生TCF4基因TGC重复序列的切除或扩增，以检测TGC重复序列及其周围区域的可能影响。不同TGC重复长度的编辑细胞在大体形态和细胞增殖率方面没有明显差异。转录组和蛋白质组学分析发现，差异表达的mRNAs和蛋白质表明，RNA剪接、内质网应激、线粒体更新、铁下垂、上皮细胞分化和雌激素信号通路的变化可能是TGC重复扩增的Fuchs内皮性角膜营养不良疾病发生的机制。对TGC重复序列扩增的细胞系进行长读捕获RNA测序，发现该细胞系存在RNA FISH和几种新的TCF4mRNA异构体。与CRISPR相关的基因组编辑也在使用不同方法的小鼠中进行了尝试，尽管还没有成功地产生具有TCF4基因TGC重复扩展的小鼠模型。

项目成果

Cellular model for FECD with CRISPR/Cas9-mediated CTG repeat expansion

具有 CRISPR/Cas9 介导的 CTG 重复扩增的 FECD 细胞模型

• 发表时间: 2022
• 作者: 陳莉偉;大内靖夫;神川あずさ;橋本友美;北本昂大;豊野哲也;相原一;臼井智彦;宮井尊史
• 通讯作者: 宮井尊史

CRISPR-Cas9によるTCF4遺伝子のCTGリピート切除の角膜内皮細胞への影響

CRISPR-Cas9 CTG重复消融TCF4基因对角膜内皮细胞的影响

• 发表时间: 2022
• 作者: 陳莉偉;大内靖夫;神川あずさ;橋本友美;北本昂大;豊野哲也;相原一;臼井智彦;宮井尊史
• 通讯作者: 宮井尊史