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Related Concept Videos

Principles of Pharmacogenetics: Types of Genetic Variants01:27

Principles of Pharmacogenetics: Types of Genetic Variants

The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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,...
Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

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...
Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

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Wild-type Blocking PCR Combined with Sanger Sequencing for Detection of Low-frequency Somatic Mutation
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Wild-type Blocking PCR Combined with Sanger Sequencing for Detection of Low-frequency Somatic Mutation

Published on: August 23, 2024

VWF sequence variants: innocent until proven guilty.

Daria Babushok1, Adam Cuker

  • 1University of Pennsylvania.

Blood
|March 3, 2012
PubMed
Summary
This summary is machine-generated.

Researchers studied genetic variations in the von Willebrand factor (VWF) in diverse healthy individuals. This research reclassifies several previously considered harmful VWF mutations as benign variations, improving our understanding of normal genetic diversity.

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Area of Science:

  • Hematology
  • Genetics
  • Molecular Biology

Background:

  • Understanding normal genetic variation is crucial for distinguishing benign polymorphisms from pathogenic mutations.
  • The von Willebrand factor (VWF) gene is a common target for genetic studies due to its role in hemostasis.
  • Previous classifications of VWF variants may have incorrectly labeled benign sequences as disease-causing.

Discussion:

  • This study re-evaluates sequence variants within the von Willebrand factor (VWF) gene.
  • It utilizes data from ethnically diverse healthy control populations.
  • The findings suggest that some previously identified VWF mutations are, in fact, normal genetic variations.

Key Insights:

  • Bellissimo and colleagues demonstrate that studying healthy, diverse populations can clarify genetic variation.
  • Several VWF sequence variants, once thought to be pathogenic, are now recognized as benign.
  • This work refines the understanding of normal VWF genetic diversity.

Outlook:

  • Future research should incorporate diverse populations to accurately assess genetic variants.
  • This approach can be applied to other genes involved in inherited blood disorders.
  • Improved classification of VWF variants will aid in diagnosing and managing bleeding disorders.