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Background:  Psoriasis is associated with significant morbidity and impaired quality of life. Identification of the host genes that influence disease susceptibility and can potentially guide future, targeted therapy is the need of the hour.    Aims:  The aim of the study was to investigate the associations of macrophage migration inhibitory factor (MIF) gene polymorphisms, that is, a 5–8-CATT tetra nucleotide repeats at -794 (-794*CATT 5–8 ) and a single-nucleotide polymorphism at -173 (-173*G/C) with the risk of chronic plaque psoriasis and to observe the correlation, if any, of disease determinants with genetic functional variants and circulating MIF levels.    Methods:  Five hundred and seventeen individuals (265 psoriasis patients and 252 controls) were genotyped for MIF gene polymorphisms. Data were analyzed with respect to disease susceptibility, serum MIF levels, disease severity, age at onset, disease duration and presence of comorbidities.    Results:  The presence of co-morbidities was more frequently noted in patients with late onset disease ( P  = 0.01). No statistically significant differences were observed either in genotype ( P  = 0.680) or allele frequency ( P  = 0.69) with respect to distribution of MIF-173*G/C polymorphism between patients and controls. The frequencies of genotypes -794*CATT 5/7 and 7/7 were significantly lower in patients ( P  = 0.027* and 0.038*, respectively). CATT* 5 /MIF-173*C haplotype occurred at a higher frequency in patients (odds ratio 3.03, 95% confidence intervals 1.09–8.47,  P  = 0.02). The mean serum MIF levels were significantly higher in patients as compared to controls ( P  &lt; 0.001). The presence of either extended MIF -794*CATT repeats or C allele did not reveal any significant association with serum MIF levels or age at onset. Analysis of effect of various disease determinants revealed no significant association with genetic variants and serum MIF levels.    Limitations:  The lesional expression of MIF could not be studied.    Conclusion:  Our results showed that CATT* 5 /MIF-173*C haplotype is associated with increased susceptibility to psoriasis vulgaris.

indian journal of dermatology, venereology, and leprology

Single-nucleotide polymorphism and haplotype analysis of macrophage migration inhibitory factor gene and its correlation with serum macrophage migration inhibitory factor levels in North Indian psoriatic patients with moderate disease severity: A cross-sectional study