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Related Concept Videos

Genome-wide Association Studies-GWAS01:11

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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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Single Nucleotide Polymorphisms-SNPs01:05

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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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Isolation and Quantification of Epstein-Barr Virus from the P3HR1 Cell Line
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Host Genetic Architecture between Epstein-Barr Virus Activity and Multiple Sclerosis Reveals Shared Pathways.

Yoshiaki Yasumizu1, Namkwon Kim1, Cyprien A Rivier1,2

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Epstein-Barr virus (EBV) DNA positivity is linked to multiple sclerosis (MS) risk through genetic factors and infected B cells. This study identifies new genetic loci and cellular mechanisms connecting EBV to MS initiation.

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Area of Science:

  • Genetics
  • Immunology
  • Virology

Background:

  • Epstein-Barr virus (EBV) is a suspected trigger for multiple sclerosis (MS), but the underlying genetic and cellular mechanisms remain unclear.
  • Understanding host genetic factors influencing EBV activity is crucial for elucidating its role in MS pathogenesis.

Purpose of the Study:

  • To identify host genetic loci associated with EBV DNA positivity.
  • To investigate the cellular mechanisms by which EBV infection may trigger MS.
  • To establish a genetic and cellular framework linking EBV to MS initiation.

Main Methods:

  • Developed a pipeline to quantify EBV DNA from whole-genome sequencing data.
  • Performed a cross-ancestry genome-wide association study (GWAS) in over 600,000 individuals.
  • Utilized quantitative PCR (qPCR), polygenic risk scores (PRS), Mendelian randomization, and single-cell RNA sequencing (scRNA-seq).

Main Results:

  • Identified 39 independent genetic loci associated with EBV DNA positivity, predominantly in the HLA region.
  • Found a significant overlap between genetic variants linked to EBV and MS risk.
  • Detected EBV-infected B cells, particularly memory and atypical B cells, which upregulate immune-activating molecules and MS risk genes.
  • Mendelian randomization supported a causal role for EBV activity in MS risk.

Conclusions:

  • Established a genetic and cellular framework connecting EBV infection to MS initiation.
  • EBV-infected B cells act as a critical hub modulating T cell responses and activating MS susceptibility pathways.
  • Genetic predisposition influences EBV activity, potentially leading to autoimmune responses like MS.