在人类胰腺小岛和β细胞中对IsomiRs的综合测序概况和功能分析
Stefano Auddino1,2, Elena Aiello1,2, Giuseppina E Grieco1,2
1Diabetes Unit, Department of Medicine, Surgery and Neurosciences, University of Siena, Siena, Italy.
Diabetologia
|March 19, 2025
概括
这项研究揭示了miRNA异型 (isomiRs) 显著调节β细胞功能和胰岛素分泌. 异构R-411-5p-Ext5p(+1) 特别影响胰岛素分泌和颗粒动力学,表明其作为糖尿病治疗点的潜力.
科学领域:
- 分子生物学分子生物学
- 内分泌学 在内分泌学.
- 遗传学 是一个遗传学.
背景情况:
- 微RNAs (miRNAs) 是基因表达的关键调节者,影响β细胞功能.
- 毫米RNA的异型 (isomiRs),毫米RNA的序列变异,具有细胞类型特定的功能.
- 在人类胰腺小岛和β细胞中缺乏全面的异构R分析.
研究的目的:
- 在不同的人类β细胞来源中对异构R表达进行分析.
- 为了识别β细胞特异性异构R签名.
- 调查特定异构酶在β细胞功能和胰岛素分泌中的功能作用.
主要方法:
- 小RNA测序 (RNA-seq) 和人类胰腺小岛和β细胞的数据集分析.
- 使用sRNAbench进行生物信息处理来分类和识别异构Rs.
- 通过在β细胞中过度表达isomiR-411-5p-Ext5p(+1) 的功能验证,随后进行葡萄糖刺激胰岛素分泌 (GSIS) 试验和转录基因分析.
主要成果:
- 异构Rs构成了miRNA读取的重要部分 (42.359.6%),其中3'末端修剪 (Trim3p) 是主要的修改.
- 确定了30个序列的β细胞特异性异构R签名,包括异构R-411-5p-Ext5p(+1).
- 异构R-411-5p-Ext5p(+1) 与胰岛素分泌相反相关,并显著降低了GSIS,影响了戈尔吉囊泡生物发生路径.
结论:
- 这项研究提供了人类小岛和β细胞中第一个全面的isomiR概况.
- 异构R-411-5p-Ext5p(+1) 被确定为胰岛素分泌和β细胞颗粒动态的关键调节器.
- 同位素Rs代表了有前途的生物标志物和糖尿病的治疗点,需要进一步研究它们的作用.
相关概念视频
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
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The human body harbors a vast and diverse viral community known as the human virome. The virome includes bacteriophages that infect bacteria, and eukaryotic viruses that infect human cells. Transient dietary and environmental viruses also contribute to this dynamic ecosystem. Estimates suggest the human body may contain on the order of 10¹³ viral particles, though abundance varies widely by body site and detection method.Comprehensive characterization of the virome has become possible only with...


