长距离的Atoh1增强剂保持了内耳毛细胞再生的能力
Tuo Shi1,2, Yeeun Kim1,2, Juan Llamas1,2
1Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California, Los Angeles CA 90033.
概括
再生性脊椎动物使用特定的增强剂来维持支持细胞 (SCs) 在受伤后产生新毛细胞 (HCs) 的潜力. 这种表观遗传机制允许SCs转化为HCs,这对于内耳再生至关重要.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
- 再生医学是一种再生医学.
背景情况:
- 细胞可塑性使血统相关的细胞能够在组织再生过程中取代缺失的细胞.
- 在再生性脊椎动物中细胞转差的基础分子机制尚未完全理解.
- 斑马鱼的内耳支细胞 (SC) 在受损时可以再生机械感知毛细胞 (HC).
研究的目的:
- 研究脊椎动物内耳中再生转基因差异化的表观遗传基础.
- 确定关键的监管元素,如增强剂,参与SCs产生HCs.
- 为了比较再生和非再生物种的染色质景观,以了解保存机制.
主要方法:
- 在斑马鱼,绿色和小鼠中对色素景观的比较分析.
- 识别和表征Atoh1基因的远程增强剂.
- 功能性研究涉及增强剂删除,以评估对发育和再生的影响.
- 调查Notch信号通路在调节增强剂活性中的作用.
主要成果:
- 确定了一类Atoh1的远程增强剂,并发现它们在再生脊椎动物的SC中保持着.
- 这些增强剂在成年SC中仍然可获得,但被Notch信号抑制,防止过早的Atoh1表达.
- 这些再生增强剂的删除在发育过程中损害了Atoh1的表达和HC的形成,并在再生过程中阻止了SC转化为HC的转化.
- 再生缺陷是特定于内耳的,表明不同感官器官的不同机制.
结论:
- 一种新型的再生增强剂保持了内耳SCs的能力,以调节Atoh1并在损伤后转化为HCs.
- 在与血统相关的细胞中,发育增强剂的持续可用性可能是再生脊椎动物中成年细胞可塑性的常见机制.
- 了解这些表观遗传机制为促进非再生物种再生提供了洞察力.
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