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相关概念视频

Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

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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...
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Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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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%...
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Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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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,...
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Pleiotropy01:33

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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,...
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Updated: Jun 17, 2025

Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation
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[罕见的VPS33B基因突变与GP1BA突变相结合导致血VWF水平严重下降:病例报告和文献综述]

S Q Ma1, X Bai2, L J Cao2

  • 1Department of hematology, Dushu Lake Hospital Affiliated to Soochow University, Suzhou 215028, China.

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一种由双基因变异引起的罕见遗传疾病导致孕妇威尔布兰德因子 (VWF) 水平极低. 这一发现突出了出血障碍的新遗传原因.

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Constitutive and Inducible Systems for Genetic In Vivo Modification of Mouse Hepatocytes Using Hydrodynamic Tail Vein Injection
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科学领域:

  • 遗传学 是一个遗传学.
  • 血液学 血液学 血液学
  • 生殖医学 生殖医学

背景情况:

  • 在一名孕妇中发现了严重缺乏凝血因子VIII活性 (FVIIIC) 和·维勒布兰德因子抗原 (VWFAg) (<1%).
  • 对VWF基因外型的初始遗传测试没有发现致病变异,临床表现不典型的类型III血友病 (·维勒布兰德病).

研究的目的:

  • 在孕妇和她的家人中调查严重VWF缺乏症的遗传基础.
  • 识别导致出血障碍的新型遗传变异.

主要方法:

  • 在患者及其家人身上使用第三代测序技术进行了全基因组测序.
  • 对VPS33B和GP1BA基因中的遗传变异进行分析.
  • 鉴定变异与VWF水平和临床表型的相关性.

主要成果:

  • 在VPS33B (c.869G>C) 中的异合体变体在多个父系家庭成员中被确定,与降低的VWF水平 (39%-56%) 相关.
  • 试验对象还携带了GP1BA (c.1474dupA) 的异合体变异,被归类为与血小板类型的伪VWD相关.
  • 这是第一份国际报告,显示VWF水平因异构卵性VPS33B变异而下降,也是第一份报告显示VWF严重减少的病例,来自VPS33B和GP1BA双重异构卵性变异.

结论:

  • 在VPS33B和GP1BA的双异构变异可以导致血VWF水平的严重下降.
  • VPS33B变种代表了新发现的VWF水平降低的遗传原因.
  • 超越VWF基因外基因的基因研究对于诊断复杂的出血障碍至关重要.