在CTNS基因中有害的非同义SNP的计算预测:对囊病的含义
Leila Adda Neggaz1, Amira Chahinez Dahmani2,3, Ibtissem Derriche4
1Laboratory of Molecular and Cellular Genetics (LGMC), University of Sciences and Technology of Oran Mohamed Boudiaf, Oran, Algeria. addaneggaz.leila@gmail.com.
BMC genomic data
|May 15, 2025
概括
这项研究确定了CTNS基因中的19种有害的遗传变异,这些变异会影响囊素的功能,这对于预防囊病至关重要. 这些发现提供了对疾病机制和囊病的潜在治疗点的见解.
科学领域:
- 遗传学和分子生物学
- 生物化学 生化学
- 计算生物学 计算生物学
背景情况:
- 囊病是一种罕见的遗传性疾病,由CTNS基因的突变引起,导致囊在溶酶体中的积累.
- 已知超过140种CTNS突变,但许多非同义单核酸多态 (nsSNP) 对囊素功能的影响仍然不清楚.
- 非同义的SNP可以直接改变蛋白质的结构和功能,可能导致疾病.
研究的目的:
- 在CTNS基因中识别有害的nsSNP.
- 用计算方法评估这些nsSNP对囊素稳定性,结构和功能的影响.
主要方法:
- 对大型SNP数据集 (12,028个SNP) 的生物信息分析,以确定nsSNP.
- 利用多种预测工具 (SIFT,PolyPhen) 和分子动力学模拟来分类nsSNP.
- 进行了保存分析和蛋白质相互作用研究.
主要成果:
- 确定了327个nsSNP,其中19个在多个工具中被一致预测为有害的.
- 大多数有害的nsSNP破坏了cystinosin的稳定性,特别是第六跨膜域中的G308R和G308V.
- 分子动力学模拟显示突变增加了灵活性,改变了结,提高了溶剂可访问性,破坏了结构.
- 特定突变 (D305G,F142S) 破坏了基本的跨膜领域,而G309V显示稳定性增加.
- 在19个突变中,有16个突变影响了高度保存的残留物,强调了它们的功能重要性.
- 蛋白相互作用分析表明,对溶酶体和膜运输蛋白协会的潜在影响.
结论:
- 在CTNS基因中确定了19种有害的nsSNP,这些nsSNP会损害囊素的稳定性和功能.
- 突出了残留物G308,D305和F142在维护囊素的结构和运输中的关键作用.
- 为未来的实验验证和针对囊病的向治疗方法的开发提供了基础.
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