The Association between the IL-20 –1723C→G Allele on the 1q Chromosome and Psoriasis Triggered or Exacerbated by an Upper Respiratory Tract Infection in the Chinese Han Population

Abstract

Background: Psoriasis is a cutaneous disorder of multifactorial etiology influenced by both genetic and environmental factors such as infection. Methods: We conducted a genome analysis with 20 microsatellite markers spanning the long arm of chromosome 1 in 36 Chinese families with psoriasis and detected evidence for linkage at 1q21 with a nonparametric linkage score of 1.74, p = 0.03, and 1q32 with one of 1.84, p = 0.03. According to the positional and functional candidate principle, we further investigated the single-nucleotide polymorphisms of the HAX-1 gene (located in 1q21) and IL-20 gene (located in 1q32) in a case-control study including 340 sporadic patients and 199 controls. Results: We determined that the frequency of the G allele of IL-20 –1723C→G (rs1713239) was significantly higher among psoriatic patients (38.5% in cases vs. 31.2% in controls, p = 0.015, odds ratio, OR = 1.39, 95% confidence interval, CI = 1.07–1.80). When we stratified our analysis by psoriasis triggered or exacerbated by infection of the upper respiratory tract, a significant difference was detected (42.4% in stratified cases vs. 31.2% in controls, p = 0.005, OR = 1.63, 95% CI = 1.15–2.30). Conclusion: We assume that triggered or exacerbated by respiratory tract infection, the population with the G allele of IL-20 –1723C→G are predisposed to psoriasis.

Erythroderma: A Clinical and Prognostic Study

“…In our study, psoriasis was the most common (55%) underlying etiology of pre-existing dermatosis, which was much higher than all the previous reports. As a result, we concluded that there might be a higher frequency of psoriasis or a greater tendency for its generalization in our district [10]; furthermore, unlike in western reports [11], injudicious use of medications, either by the individual or prescribed by physicians, may partly be responsible for the higher rate of psoriasis (the most frequently suspected trigger factors were upper respiratory tract infections and withdrawal of oral medicines including systemic corticosteroids or Chinese traditional herbal medicines). In our study, we also found bullous pemphigoid, hypereosinophilic syndrome and dermatomyositis as causes of erythroderma, which have never or rarely been mentioned in previous reports.…”

Genetics of Psoriasis and Pharmacogenetics of Biological Drugs

“…Minor alleles of rs2243188 and rs2243158 in IL19 have a protective effect in patients with the disease (Table 1) [64]. In a case-control study (340 cases and 199 controls), the G allele in rs1713239 ( IL20 ) was associated with psoriasis in a Chinese population (Table 1) [65]. Kingo et al (2004) found an association between G allele carriers of rs2981572 ( IL20 ) and predisposition to psoriasis in Caucasian patients (Table 1) [66].…”

Antibiotic Exposure, Infection, and the Development of Pediatric Psoriasis

“…Individuals with psoriasis triggered or worsened after upper respiratory tract infections more likely carried interleukin 20 polymorphisms in one study. 36 Another study found that young children with psoriasis more commonly had interleukin 22 promoter variants associated with higher circulating levels of this proinflammatory cytokine important in epithelial host defense. 37 …”