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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
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Mutations01:39

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Definition of mutations in polyautoimmunity.

Angad Johar1, Juan C Sarmiento-Monroy2, Adriana Rojas-Villarraga2

  • 1Genomics and Predictive Medicine, Genome Biology Department, John Curtin School of Medical Research, ANU College of Medicine, Biology & Environment, The Australian National University, Canberra, ACT, Australia.

Journal of Autoimmunity
|May 23, 2016
PubMed
Summary

Whole exome sequencing identified novel rare variants linked to familial autoimmunity. These genetic variants in genes like SRA1 may play a significant role in autoimmune diseases.

Keywords:
Extreme phenotypeFamilial autoimmunityGeneticsLinkageNetwork analysisPolyautoimmunity

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Area of Science:

  • Genetics
  • Immunology
  • Genomic Medicine

Background:

  • Familial autoimmunity and polyautoimmunity are extreme phenotypes that can reveal major genomic contributors to autoimmune diseases.
  • Whole exome sequencing (WES) and linkage analysis are powerful tools for identifying genetic variants by examining familial segregation patterns.

Purpose of the Study:

  • To identify potentially autoimmune-causing genetic variants using WES data from families with polyautoimmunity.
  • To investigate the genetic basis of familial and polyautoimmunity in extreme phenotypes.

Main Methods:

  • Conducted WES on DNA from 47 individuals across 10 extreme pedigrees with familial autoimmunity or polyautoimmunity.
  • Utilized Genome Analysis Toolkit for variant calling, followed by a filtration and prioritization framework.
  • Performed genetic linkage analysis and confirmed significant variants using Sanger sequencing.

Main Results:

  • Identified novel, rare variants in SRA1, MLL4, ABCB8, DHX34, and PLAUR that showed significant genetic linkage (LOD scores >3.0) to polyautoimmunity.
  • The strongest linkage signal was observed in the SRA1 gene (LOD score of 5.48).
  • Network analyses suggested that SRA1, PLAUR, and ABCB8 are involved in regulating apoptotic processes.

Conclusions:

  • Novel rare variants linked to polyautoimmunity were discovered through WES.
  • The identified genes, particularly SRA1, may represent major genetic factors contributing to autoimmunity.