一种新型的同卵性COX6A1变体导致轴突Charcot-marie-tooth疾病,发育延迟和线粒体功能障碍
Qianyun Cai1,2,3, Haijiao Wang1,2,3, Rong Luo1,2,3
1Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, China.
Journal of human genetics
|October 3, 2025
概括
一种新的COX6A1基因变异在儿童中引起严重的线粒体功能障碍,发育迟缓和夏科特-玛丽-图斯病. 这种止损突变突出了线粒体疾病的新疾病机制.
科学领域:
- 生物化学 生物化学
- 遗传学 遗传学 是一个
- 神经科学是一个神经科学.
背景情况:
- 线粒体复合体IV (细胞染色体c氧化酶,COX) 通过氧化酸化对细胞能量产生至关重要.
- 包括COX6A1在内的COX基因的致病变异与各种神经肌肉疾病有关.
- 众所周知,衰退性COX6A1变异会导致夏科特-玛丽-图斯病 (CMT),但其全谱和机制尚未完全理解.
研究的目的:
- 研究一种罕见的COX6A1变体的遗传基础和分子机制,该变体呈现全球发育延迟和轴突CMT.
- 为了描述COX6A1基因中新型止损突变的致病性.
- 扩大对COX6A1相关线粒体疾病的表型和遗传谱的理解.
主要方法:
- 整体外体序列测序 (WES) 用于识别患有全球发育迟缓和轴突CMT的患者的遗传变异.
- 进行了功能性测试,以评估COX6A1变异对蛋白质水平的影响.
- 分析了临床数据,包括患者表现和疾病进展.
主要成果:
- 在该患者身上发现了一种罕见的同卵性COX6A1止损变体 (c.329A>T,p.110Leuext41),预计会产生比野生类型长41个氨基酸的蛋白质.
- 功能测试显示突变COX6A1蛋白的水平显著降低,证实了其致病性.
- 患者呈现全球发育迟缓,轴突CMT,乳酸水平升高,并经历了快速减补,在3.5岁时死于发烧性疾病.
结论:
- 这项研究报告了首次发现的COX6A1止损变体,扩大了已知的线粒体疾病遗传原因.
- 这种新型的致病变体导致严重的线粒体功能障碍,发育延迟和致命的CMT表现.
- 止损突变是导致COX6A1相关疾病和线粒体功能障碍的重要机制.
更多相关视频
07:43Modeling Charcot-Marie-Tooth Disease In Vitro by Transfecting Mouse Primary Motoneurons
Published on: January 7, 2019
7.4K
08:56Modeling Mitochondrial Disease Using Brain Organoids: A Focus on Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-like Episodes
Published on: October 10, 2025
623
相关概念视频
Animal Mitochondrial Genetics
9.0K
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...
9.0K
Pleiotropy
43.2K
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
43.2K
Incomplete Dominance
29.6K
Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
29.6K
Sex-linked Disorders
108.3K
Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
108.3K
Mitochondrial Protein Sorting
5.6K
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
5.6K
X-linked Traits
58.2K
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
58.2K
