突变导致X链接氨基基基因不完善改变miRNA形成从氨基基基因exon4
R Shemirani1,2, M H Le2,3,4, Y Nakano1,5
1Department of Orofacial Sciences, School of Dentistry, University of California, San Francisco, CA, USA.
Journal of dental research
|August 11, 2023
概括
原蛋白基因exon4和exon5中的突变破坏了exon4的拼接,影响了microRNA的产生,并导致X链接的原蛋白不完美. 这会影响牙面膜的形成和牙的发育.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- 杏仁素对于牙质膜的形成至关重要.
- 在X染色体的杏仁基因突变导致X相关的杏仁基因不完美 (AI).
- 杏仁原蛋白前mRNA的替代拼接会产生miR-exon4,这与牙和骨的发育有关.
研究的目的:
- 调查X链接AI相关突变在4号和5号氨基基蛋白外体中的4号和5号外体对4号外体剪接和miR-exon4形成的影响.
- 确定参与杏仁素4号和5号外因子拼接的调节因素.
主要方法:
- 在HEK-293细胞中进行氨基基素小基因转染,以研究拼接.
- 在分析中预测拼接因子.
- 电泳运动转移试验 (EMSA) 来确认蛋白质-RNA相互作用.
- 转移到LS8骨髓质细胞中,以评估向基因表达.
主要成果:
- 在 amelogenin exons 4 和 5 中的特定突变 (c.120T>C,c.152C>T,c.155C>G,c.155delC) 显著改变了 exon 4 拼接和减少了 miR-exon4 生产.
- SRSF2和SRSF5被确定为分别为4号和5号外子的关键拼接因子,突变影响了它们的结合.
- 突变导致miR-exon4目标的表达改变,包括Prkch.的上调.
结论:
- 在miR-exon4生产过程中,exon 4的剪接至关重要.
- 导致X链接AI的突变破坏了这种拼接过程,影响了miR-exon4水平.
- 改变的miR-exon4生产代表了X链接AI中的额外的致病机制,有助于质缺陷.
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