GAA-FGF14扩展和CACNA1A变体:表型重叠和诊断影响
Elisabetta Indelicato1, Zofia Fleszar2,3, David Pellerin4,5
1Center for Rare Movement Disorders Innsbruck, Department of Neurology, Medical University Innsbruck, Innsbruck, Austria.
概括
由FGF14重复扩张引起的脊髓小脑动27B (SCA27B). 这项研究在9%的CACNA1A变异患者中发现了SCA27B,这表明需要重新评估晚发性.
科学领域:
- 神经遗传学
- 神经学
- 基因组学
背景情况:
- 脊髓小脑动27B (SCA27B) 与FGF14内部重复扩张有关.
- SCA27B 呈现慢性小脑缩和偶发性症状,与 CACNA1A 谱系障碍重叠.
研究的目的:
- 确定GAA- FGF14重复扩张的频率,这些患者最初被诊断为CACNA1A相关的缩症.
- 在这个患者队列中研究FGF14测试的诊断效用.
主要方法:
- 横截面,多中心研究设计.
- 在患有CACNA1A变异的患者中进行GAA- FGF14重复扩张的基因检测.
- 不确定意义的CACNA1A变体的重新分类.
主要成果:
- 在9% (6/67) 的CACNA1A变异患者中发现了致病性GAA- FGF14扩张 (≥250次重复).
- 患有GAA- FGF14扩张的患者表现为晚发 (> 40岁) 和携带CACNA1A VUS.
- 在GAA- FGF14扩张的6名患者中,有4名患者的CACNA1AVUS被重新分类为可能良性,证实了SCA27B的诊断.
结论:
- 最初归因于CACNA1A变异的晚发性性动症需要对SCA27B进行重新评估.
- 对GAA-FGF14重复扩张的基因检测至关重要,特别是当存在不确定的CACNA1A变异时.
相关概念视频
Genome-wide Association Studies-GWAS
14.1K
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...
14.1K
Cystic Fibrosis: Pathogenesis
358
Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
358
Comparing Copy Number Variations and SNPs
17.9K
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%...
17.9K
Pleiotropy
41.1K
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,...
41.1K
Cardiomyopathy III: Hypertrophic Cardiomyopathy
45
Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
45


