在小鼠的Slc12a2转录中完全缺少21号外子,导致听力损失
Hideki Mutai1,2, Yukiko Kuroda3, Shinobu Noji3
1Division of Hearing and Balance Research, National Institute of Sensory Organs, NHO Tokyo Medical Center, Tokyo, Japan. mutai.hideki@kitasato-u.ac.jp.
Scientific reports
|April 28, 2025
概括
研究人员开发了针对遗传性听力损失的小鼠模型,特别是DFNA78,与SLC12A2基因相关. Slc12a2Em2/Em2模型显示严重的听力损失,提供了对耳功能障碍的见解.
科学领域:
- 遗传学和分子生物学
- 耳鼻喉科 耳鼻喉科 耳鼻喉科
- 发展生物学 发展生物学
背景情况:
- 遗传性听力损失在遗传上是多样化的,SLC12A2中的突变会导致自体主导非综合征性听力损失类型DFNA78.
- 编码NKCC1共传媒体的SLC12A2中的致病变体,仅在21号外子中发现,影响耳功能.
研究的目的:
- 创建和描述模仿DFNA78遗传性听力损失的小鼠模型,这种遗传性听力损失是由Slc12a2变体引起的.
- 研究改变Slc12a2剪接对耳发育和听觉功能的功能影响.
主要方法:
- 产生两个小鼠菌株 (Slc12a2Em1/Em1和Slc12a2Em2/Em2) 具有特定的Slc12a2外子21拼接位变异.
- 听觉脑干响应 (ABR) 测试,耳结构组织学分析 (血管系) 和RNA测序 (RNA-seq).
- 迷你基因测试用于评估核酸差异对外子拼接的影响.
主要成果:
- Slc12a2Em2/Em2小鼠表现出减少的内淋巴,血管的低成形和缺席的ABRs,表明严重的听力损失.
- 在Slc12a2Em2/Em2耳中Cldn9的升调表明细胞对修复细胞间隙的反应.
- 雌性Slc12a2Em2/+小鼠表现出轻微的听力值升高,而Slc12a2Em1/Em1小鼠的听力正常.
- 迷你基因测试证实,单个核酸差异会影响21号外核子的拼接.
结论:
- 鼠标模型Slc12a2Em2/Em2准确地回顾了DFNA78遗传性听力损失的关键病理特征.
- 异位子21拼接对于NKCC1功能和耳平衡至关重要.
- 这种小鼠模型为研究DFNA78病原和潜在的治疗策略提供了有价值的工具.
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