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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.
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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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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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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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Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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Updated: Apr 23, 2026

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
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Genetic Evidence Linking Immune Cell Subsets to Psoriatic Arthritis Susceptibility: A Mendelian Randomization Study.

Huiwei Wang1, Mingxuan Ma1, Chenfeng Wang2

  • 1Department of Dermatology, The First Hospital of Jilin University, Jilin University, Changchun, Jilin Province, People's Republic of China.

Psoriasis (Auckland, N.Z.)
|April 22, 2026
PubMed
Summary

This study used Mendelian randomization to identify immune cell types associated with psoriatic arthritis (PsA) risk. Activated B cells and specific T cell subsets were linked to increased PsA risk, suggesting new therapeutic targets.

Keywords:
Mendelian randomizationgenome-wide association studiesimmunocyte phenotypepsoriatic arthritissingle nucleotide polymorphisms

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Area of Science:

  • Immunology
  • Genetics
  • Rheumatology

Background:

  • Psoriatic arthritis (PsA) involves complex immune pathways beyond the IL-23/IL-17 axis.
  • Many patients do not respond adequately to current PsA therapies.
  • Identifying novel immune drivers is crucial for developing new treatments.

Purpose of the Study:

  • To investigate the influence of specific immune cell populations on PsA susceptibility using a bidirectional two-sample Mendelian randomization (MR) study.
  • To identify novel genetic associations between immune traits and PsA risk.

Main Methods:

  • Utilized genetic instruments for immune traits from a Genome-Wide Association Study (GWAS) of European individuals.
  • Employed summary data for PsA from the IEU database.
  • Applied inverse variance weighting (IVW) as the primary analytical method.

Main Results:

  • Identified 14 immune phenotypes associated with increased PsA risk and 12 with decreased risk at a nominal significance level (P < 0.05).
  • Activated B cells (expressing CD25 and BAFF-R on IgD+CD24+ subsets) and specific T cell subsets (CCR7+ naïve CD4+ T cells, CD127+CD45RA+CD4+ T cells) emerged as risk factors.
  • Certain natural killer T cell phenotypes suggested a protective role; reverse MR indicated PsA liability may alter immune cell populations, potentially reflecting migration to inflamed tissue.
  • Crucially, none of these associations remained significant after false discovery rate correction, indicating exploratory findings.

Conclusions:

  • The study provides a hypothesis-generating resource for PsA therapies targeting B cell stimulation, highlighting potential humoral immune involvement.
  • Findings suggest novel genetic underpinnings of immune dysregulation in PsA.
  • Further validation in larger, independent cohorts is necessary due to the preliminary nature of the associations.