与MT-ATP6基因变异相关的利氏综合征的多样性
Sara Martins1, Maria João Santos2, Marta Simões3
1University of Coimbra CNC - Center for Neurosciences and Cell Biology; CIBB - Center for Innovative Biomedicine and Biotechnology; IIIUC - Institute of Interdisciplinary Research Coimbra Portugal.
Endocrine, metabolic & immune disorders drug targets
|October 11, 2023
概括
这项研究研究了Leigh综合征 (LS) 并发现特定的线粒体DNA (mtDNA) 变异,m.8993T>G和m.8993T>C,与线粒体呼吸链功能受损有关. 这些发现突显了LS患者的遗传异质性和可变的临床表现.
科学领域:
- 遗传学 遗传学 是一个
- 线粒体生物学 线粒体生物学
- 神经学 神经学
背景情况:
- 李氏综合征 (LS) 是一种严重的遗传性疾病,其特点是线粒体生物能学有缺陷,导致神经症状和经常早期死亡.
- LS在遗传上是异质的,在线粒体DNA (mtDNA) 中发生突变,特别是在MT-ATP6基因中 (例如,m.8993T>G,m.8993T>C),与ATP合成受损有关.
- 这些特定的mtDNA变异影响ATP合成酶子单元6中的保存氨基酸,破坏F0域和线粒体能量生产.
研究的目的:
- 调查疑似患有莱氏综合征的患者的遗传和生物能量概况.
- 描述5例m.8993T>GmtDNA变异的临床和遗传发现,以及一个组合m.8993T>C和m.1555A>G变异的家族.
- 突出诊断挑战和全面分析在LS的重要性.
主要方法:
- 收到并分析了48个LS疑似患者的样本.
- 进行了生物能量评估,包括线粒体呼吸链 (MRC) 复杂活性和乌比基诺含量.
- 进行遗传分析,如mtDNA复制数的确定,测序和PCR-RFLP.
主要成果:
- 确定了6例与LS相关的核酸8993的致病性mtDNA变异.
- 五例患者携带了m.8993T>G变异,具有不同的异质体水平和相关的MRC复杂缺陷.
- 一个家族呈现了同质体m.1555A>G和异质体m.8993T>C变异的组合,试验物显示复合V缺乏.
结论:
- mtDNA 8993核酸中的致病变体与LS和线粒体呼吸链复合体V活动受损有关.
- LS表现出显著的临床变异性和遗传异质性,其中一些患者缺乏经典的致病变体,而另一些患者是无症状的携带者.
- 使用古典方法和多组织分析进行全面的表征对于诊断LS患者和识别载体至关重要.
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