洞察由GARS1病原型变体引起的表型变异性
Jesús Jiménez-Jiménez1,2, Irene Navarrete3, Inmaculada Azorín2,4
1Neuromuscular Diseases Unit, Department of Neurology, Hospital Universitari i Politècnic La Fe, Valencia, Spain.
European journal of neurology
|July 25, 2024
概括
在GARS1基因的致病变体可以导致远端遗传性运动神经病变 (dHMN) 与"分手"和感官问题,即使有正常的神经传导研究. 这突出了潜在的感觉神经元功能障碍,影响神经末.
科学领域:
- 神经学 神经学
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
背景情况:
- 糖基-tRNA合成酶1 (GARS1) 基因中的致病变体与几个神经肌肉疾病有关.
- 这些疾病包括Charcot-Marie-Tooth病2D型,远端遗传运动神经病变 (dHMN) 型V,以及婴儿脊柱肌肉缩.
研究的目的:
- 调查GARS1变异的临床谱,特别是c.794C>T (p.Ser265Phe) 误解变异.
- 描述与这种GARS1变体相关的表型,包括神经学,电生理学和组织学发现.
主要方法:
- 这是一项对12名患有GARS1 c.794C>T变异的患者进行的横截面回顾性研究.
- 对皮肤活检中的临床数据,神经传导研究,MRI和皮内神经纤维密度的审查.
主要成果:
- 发病的平均年龄为9.5岁,手部内在肌肉受到早期影响.
- 主要的远部肌肉衰弱,特别是在thenar复合体和第一个背部骨内.
- 电生理学只证实了轴突运动神经病变;MRI显示腿部肌肉缩和脂肪透.
- 六名患者有"分手"指数,9名患者显示皮内神经纤维密度降低.
结论:
- GARS1变种可以表现为dHMN,具有"分手"和感官障碍.
- 尽管进行了正常的感觉神经传导研究,但仍可能出现感觉症状.
- 这表明背部根系质感觉神经元功能障碍影响皮肤神经末端.
相关概念视频
Genome-wide Association Studies-GWAS
13.3K
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
GWAS does not require the identification of the target gene involved in...
13.3K
Single Nucleotide Polymorphisms-SNPs
14.9K
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
14.9K
Comparing Copy Number Variations and SNPs
17.7K
Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
17.7K
Genetic Screens
4.9K
Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which...
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which...
4.9K
Incomplete Dominance
22.3K
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.
22.3K
Pleiotropy
40.4K
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,...
40.4K


