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同胞性EPRS1误解变异导致低髓化白血病变异-15变异变异-远距离mRNAm6A站点可访问性

Debjit Khan¹, Iyappan Ramachandiran¹, Kommireddy Vasu¹

¹Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic, Lerner Research Institute, Cleveland, OH, USA.

Nature communications

|May 20, 2024

概括

一种EPRS1的遗传变异通过损害RNA修饰和输出,导致低髓性白血病 (HLD15). 这一发现为针对HLD和类似遗传疾病的基于RNA的个性化疗法开辟了道路.

科学领域:

遗传学遗传学是一种遗传学.
分子生物学分子生物学
神经科学是一个神经科学.

背景情况:

低肌性白血病 (HLD) 是一组影响中枢神经系统肌化的罕见遗传疾病.
HLD15与EPRS1基因的变异有关,该基因编码了谷氨基烯酸-烯酸-tRNA合成酶.

研究的目的:

调查由EPRS1变异引起的HLD15背后的分子机制.
探索RNA修饰的作用,特别是N6-甲基氨酸 (m6A),在HLD15.
确定HLD15.5的潜在治疗点.

主要方法:

外体序列测定在受影响的兄弟姐妹中发现了EPRS1中的同卵性误解变异.
对患者的淋巴细胞细胞系进行分析,以评估EPRS1蛋白水平,mRNA核输出和翻译.
研究了变体对METTL3对EPRS1mRNA的m6A修改及其通过YTHDC1和YTHDF1/3.3的读数的影响.
在救援实验中使用了反感性形态分子和向RNA甲基化编辑器 (METTL3-dCas13b).

主要成果:

鉴定到的EPRS1变异导致EPRS1蛋白表达减少,原因是mRNA核出口和翻译受损.
变异mRNA显示m6A修改和读数减少,影响mRNA可访问性进行修改,而不是改变目标部位序列.
救援实验表明,恢复m6A站点的可访问性或修改可以改善细胞缺陷.
生物信息分析表明,类似的机制可能是其他遗传疾病的基础.

结论:

这项研究揭示了一个新的RNA依赖机制,SNVs通过改变mRNA m6A站点可访问性来影响基因表达.
这一发现扩大了对HLD病原学的理解,并为开发基于RNA的治疗策略提供了基础.
结果突出了个性化RNA疗法的潜力,该疗法针对遗传疾病中的RNA修饰途径.

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