Variations in the human Th2-specific chemokine TARC gene

Area of Science:

• Immunology
• Genetics
• Allergy Research

Background:

• Th2-specific chemokine thymus and activation-regulated chemokine (TARC)/CC chemokine ligand (CCL)17 is implicated in Th2-dominated allergic diseases like asthma and atopic dermatitis.
• Understanding the genetic basis of TARC may offer insights into disease pathogenesis.

Purpose of the Study:

• To screen the TARC gene for polymorphisms in coding and promoter regions.
• To investigate the functional significance and association of identified TARC gene polymorphisms with allergic diseases.

Main Methods:

• Polymorphism screening of TARC gene's coding and promoter regions.
• Genotyping of a 5'-flanking region single nucleotide polymorphism (SNP) at -431C>T.
• Quantification of serum TARC levels in relation to genotypes.
• Association analysis of the SNP with susceptibility to bronchial asthma (BA) and atopic dermatitis (AD) in patient cohorts.

Main Results:

• Identified two rare coding variations (2134C>T, 2037G>A) and one 5'-flanking SNP (-431C>T) in the TARC gene.
• The -431T allele was associated with significantly increased serum TARC levels, suggesting functional relevance.
• No significant association was found between the -431C>T SNP and susceptibility to bronchial asthma or atopic dermatitis.

Conclusions:

• The TARC -431C>T polymorphism influences serum TARC levels but is not a significant risk factor for developing bronchial asthma or atopic dermatitis.
• Further research may be needed to explore other genetic or environmental factors contributing to the pathogenesis of these allergic conditions.