Association of HLA-DQA1 and DQB1 alleles with keloids in Chinese Hans

Abstract

Some studies have suggested that human HLA status might potentiate development of keloids phenotype, and exists ethnic differences. No report has been published about HLA-DQA1 and DQB1 alleles associated with keloids in Chinese Hans. To investigate whether HLA-DQA1 and DQB1 alleles are associated with genetic susceptibility to keloids in Chinese Hans. Polymerase chain reaction-sequence-specific primer (PCR-SSP) method was used to analyze the distribution of HLA-DQA1 and DQB1 alleles among 192 patients with keloids and 273 healthy controls in Chinese Hans. (1) The frequencies of HLA-DQA1*0104, DQB1*0501 and DQB1*0503 (OR = 2.13, P(c) = 0.0063; OR = 14.42, P(c) < 10(-7) and OR = 6.09, P(c) < 10(-7), respectively) were significantly higher, while the frequencies of DQA1*0501, DQB1*0201 and DQB1*0402 (OR = 0.46, P(c) = 0.0099; OR = 0.24, P(c) < 10(-4) and OR = 0.10, P(c)=0.0054, respectively) were lower in patients than in controls. (2) In this study significant susceptibility haplotypes to keloids were DQA1*0104-DQB1*0501 and DQA1*0104-DQB1*0503. (3) HLA-DQB1*0501 and DQB1*0503 were positively associated with all subgroups of keloid patients. However, the DQA1*0104 (OR = 2.51, P(c) = 0.0009; OR = 2.22, P(c) = 0.0090 and OR = 2.20, P(c) = 0.0117, respectively) was only prevalent in keloid patients with single site, moderate severity and negative family history. (4) HLA-DQB1*0201 (OR = 0.27, P(c) = 0.0018 and OR = 0.27, P(c) = 0.0012, respectively) and DQB1*0402 (OR = 0.07, P(c) = 0.0270 and OR = 0.07, P(c) = 0.0306, respectively) were negatively associated with moderate severity and negative family history in keloids, moreover, HLA-DQB1*0201 (OR = 0.23, P(c) = 0.0003) and DQA1*0501 (OR = 0.43, P(c) = 0.0234) were less prevalent in patients with single site. This study demonstrated the positive association of HLA-DQA1 and DQB1 alleles and haplotypes with keloids.