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Protein Tyrosine Phosphatase PTPN22 +1858C/T Polymorphism is Associated with Active Vitiligo

Overview
Journal Exp Ther Med
Specialty Pathology
Date 2014 Oct 8
PMID 25289035
Citations 11
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Abstract

Vitiligo is characterized by a skin depigmentation disorder resulting from an autoimmune response targeting melanocytes. Within the genetic factors involved in the development of the vitiligo immune response, various genes in the major histocompatibility complex (MHC) and non-MHC loci have been considered to be risk factors. The gene encodes for a lymphoid protein tyrosine phosphatase, a regulator of the activation and development of T-cells. The polymorphism has been associated to autoimmune disease susceptibility in different populations and could be implicated in the onset of vitiligo. To assess the possible association between the presence of and vitiligo, 187 patients with vitiligo and 223 control subjects were analyzed in the study. Genomic DNA was isolated using the salting-out method and samples were subjected to polymerase chain reaction-restriction fragment length polymorphism in order to detect the polymorphism. Causal associations were determined by χ test and their respective odds ratio (OR) was assessed in a 2×2 contingency table. The results showed an association between active vitiligo and the allele T load [P=0.0418; OR, 2.5706; 95% confidence interval (CI), 1.0040-6.5816], and active vitiligo-CT genotype (P=0.0389, OR, 2.6548; 95% CI, 1.0191-6.9156). In conclusion, the present data indicates a possible association between the genotype and a significant susceptibility of developing an active form of vitiligo.

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