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Related Experiment Videos

Molecular variations in Th1-specific cell surface gene Tim-3.

Soo-Cheon Chae1, Ju-Hee Song, Pann Pounsambath

  • 1Genome Research Center for Immune Disorders, Wonkwang University School of Medicine, Iksan Chonbuk 570-749, Korea.

Experimental & Molecular Medicine
|July 24, 2004
PubMed
Summary

Researchers identified genetic variations in the T cell immunoglobulin mucin 3 (Tim-3) gene in patients with asthma or allergic rhinitis. These findings in the Tim-3 gene could impact autoimmune disease research.

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Area of Science:

  • Immunology
  • Genetics

Background:

  • T-cell immunoglobulin domain and mucin domain (TIM) proteins, including Tim-3 (T cell immunoglobulin mucin 3), are expressed on T cells.
  • Tim-3 is selectively expressed on differentiated Th1 cells and may play a role in autoimmune diseases by regulating macrophage activation and Th1 responses.

Purpose of the Study:

  • To identify variation sites within the coding and promoter regions of the human Tim-3 gene.
  • To investigate potential genetic differences in Tim-3 associated with asthma and allergic rhinitis.

Main Methods:

  • Direct sequencing was used to scan for variations.
  • Genomic DNA was isolated from patients with asthma or allergic rhinitis and healthy controls.

Main Results:

  • Four single nucleotide polymorphisms (SNPs) were identified in the human Tim-3 gene.

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  • One novel SNP (-1541C>T) and two variation sites (-1292_-1289delTAAA and -1282_-1278dupTAAAA) were found in the coding and promoter regions.
  • These variations were present in both patient and healthy control groups.

    • Conclusions:

    • Genetic variations exist in the coding and promoter regions of the human Tim-3 gene.
    • These variations were observed in individuals with and without asthma or allergic rhinitis.
    • Further research is needed to understand the functional implications of these Tim-3 gene variations.