新的KCNQ2误解变异扩大了DEE7的基因型谱
Chao Wang1, JinXia Zhai1, YongJun Chen2
1Department of Neurology, the Affiliated Nanhua Hospital, Hengyang Medical School, University of South China, Hengyang, China.
概括
一种新的KCNQ2基因变异,p.ALa336Glu,与和发育障碍有关. 在Drosophila的功能研究证实了它的致病性,扩大了KCNQ2基因型-表型的理解.
科学领域:
- 神经遗传学 神经遗传学
- 分子生物学分子生物学
- 道病变是一种通道病变.
背景情况:
- KCNQ通道调节神经元刺激性,并与和自闭症谱系障碍 (ASD) 有关.
- KCNQ2基因 (KV7.2) 与发育延迟和各种发病有关,但变异性致病性往往未被证明.
- 变体解释中的不确定性可能导致对功能后果的误解.
研究的目的:
- 在患有神经症状的患者中识别和功能性地表征一种新的KCNQ2基因变异.
- 使用计算和体内模型调查KCNQ2误解变异的致病性.
- 提高对KCNQ2相关疾病中的基因型-表型相关性的理解.
主要方法:
- 针对性下一代测序和桑格测序确定了一个新的KCNQ2误解变体 (NM_172107.4:c.1007C>A(p.ALa336Glu)).
- 包括结和对接在内的计算分析评估了潜在的功能障碍.
- 在Drosophila中使用RNAi介导的KCNQ淘汰和人类KCNQ2救援实验进行了功能验证.
主要成果:
- 确定了一种新的KCNQ2误解变异,p.ALa336Glu,它改变了氨基酸336从氨酸转变为谷氨酸.
- 计算建模表明,该变种可能会导致功能障碍.
- 带有KCNQ淘汰的多索菲拉模型表现出性行为,寿命缩短,爬能力受损,这些都是通过正常的人类KCNQ2表达来挽救的.
结论:
- 这项研究在KCNQ2基因中发现了一种新的致病变体.
- 这些发现扩大了已知的KCNQ2相关疾病的遗传谱.
- 这项研究加强了KCNQ2通道病变的基因型-表型联系.
相关概念视频
Exon Recombination
3.6K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.6K
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
Gene Duplication and Divergence
6.1K
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
6.1K
Single Nucleotide Polymorphisms-SNPs
15.0K
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,...
15.0K
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
Incomplete Dominance
22.5K
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.
22.5K


