线粒体tRNAGlu基因中的一种新型m.14677 T > C变体导致慢性渐进的外部眼膜
Nahoko Katayama Ueda1,2,3, Masakazu Mimaki4,5, Shota Ito6
1Medical Genome Center, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan.
Journal of human genetics
|August 6, 2025
概括
一种新的线粒体DNA变体,m.14677 T>C在tRNAGlu基因中,已被确定为慢性渐进性外部眼 (CPEO) 的原因. 这一发现强调了单纤维分析在诊断线粒体疾病中的重要性.
科学领域:
- 遗传学 是一个遗传学.
- 线粒体生物学 线粒体生物学
- 神经学 神经学
背景情况:
- 慢性渐进性外部眼 (CPEO) 是一种使人虚弱的线粒体疾病.
- 它通常是由线粒体DNA (mtDNA) 的突变引起的,通常会影响tRNA基因.
- 诊断可能具有挑战性,特别是新型变种.
研究的目的:
- 在血液检测结果正常的患者中确定CPEO的遗传原因.
- 在tRNA基因中描述一种新型变异.
- 评估单纤维分析在诊断线粒体疾病中的实用性.
主要方法:
- 组织病理学检查肌肉活检,包括COX染色.
- 线粒体DNA (mtDNA) 测序和长聚合酶链反应 (PCR) 分析.
- 单纤维分析,以量化变异负载在破碎的红色纤维 (RRFs) 与非RRFs.
主要成果:
- 一个新的mtDNA变异,m.14677 T>C,在tRNAGlu基因中被确定.
- 这种变体在肌肉组织中显示了45%的异质体.
- 与非RRF相比,在RRF中观察到显著更高的m.14677 T>C的突变负载 (P=0.03).
结论:
- 新的tRNA Glu基因变异m.14677 T>C是致病性,并导致CPEO.
- 单纤维分析是评估mtDNA变异的致病性,特别是tRNA基因的宝贵工具.
- 结合生化,组织病理和遗传分析对于诊断线粒体疾病至关重要.
相关概念视频
Translation
143.4K
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
143.4K
Genetic Lingo
104.7K
Overview
104.7K
Animal Mitochondrial Genetics
8.0K
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
8.0K
Angle Closure Glaucoma: Treatment
684
Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
684
ATP Synthase: Structure
13.1K
ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
13.1K
ATP Synthase: Mechanism
15.2K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
15.2K


