在哺乳动物中,Dgcr8功能在二级心脏场中,用于输出通道和右心室发育
Silvia E Racedo1, Yang Liu2, Lijie Shi1
1Department of Genetics, Albert Einstein College of Medicine, Bronx, NY, USA.
Developmental biology
|December 18, 2023
概括
在小鼠中,DGCR8基因失活会导致严重的心脏缺陷,包括持续性动脉和右心室低成形. 这项研究揭示了22q11.2删除综合征模型中微RNA处理影响心脏发育的早期分子变化.
科学领域:
- 发育生物学是发展生物学.
- 遗传学 遗传学是一种遗传学.
- 心血管研究的心血管研究.
背景情况:
- DGCR8对于微RNA (miRNA) 处理至关重要,位于22q11.2区域,在22q11.2删除综合征中经常被删除.
- 患有22q11.2删除综合征的患者经常表现出心脏输出管道形,部分起源于前部第二心脏场 (aSHF).
研究的目的:
- 调查DGCR8在心脏发育过程中的前置第二心脏场 (aSHF) 中的作用.
- 阐明在aSHF中DGCR8损失引起的心脏缺陷背后的分子机制.
主要方法:
- 使用Mef2c-AHF-Cre.Cre 在小鼠aSHF中条件失活Dgcr8基因.
- 在胚胎日的条件零与野生型 littermates 中aSHF和心脏外流通道的基因表达概况 (mRNA和miRNA) 9.5.5.
主要成果:
- 在aSHF中DGCR8的失活导致了完全透的持续性动脉和右心室的低可塑性,导致由E14.5.5引起的胚胎死亡.
- 基因表达概况显示了与心脏发生相关的mRNA的失调,以及pri-miRNA的显著增加和成熟miRNA水平的下降.
- 特定的与心脏相关的miRNAs,包括miR-1a,miR-133a和miR-145a,表达减少,与累积的primiRNAs相关.
结论:
- 在aSHF中早期失去DGCR8功能会扰乱正常的心脏发育,导致严重的先天性心脏缺陷.
- 由于DGCR8缺陷而改变的miRNA处理是一个关键的分子事件,有助于在22q11.2删除综合征的模型中观察到的心脏形.
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