[The study on correlativity between HLA-DQ gene polymorphism and primary Sjogren's syndrome of the Han nationality in Shanxi province].

AIM: To explore the correlativity between HLA-DQ allele and primary Sjogren's syndrome(pSS) of the Han nationality in Shanxi province and to understand the pathogenesis of pSS at the gene level.
METHODS: Polymerase chain reaction sequence specific primers (PCR-SSP) technique was used to determine the alleles of HLA-DQA1 and HLA-DQB1 of pSS patients and healthy populations, and the difference in their HLA-DQA1 and HLA-DQB1 allelic frequencies were analyzed by using chi-square test and Fisher's exact test.
RESULTS: (1) The gene frequency of HLA-DQA1*0501 in pSS patients was significantly higher than that in healthy controls(22.0% vs 12.0%, x(2);=7.087, P<0.05, RR=2.068). (2)The gene frequency of HLA-DQA1*0301/2 in pSS patients was significantly lower than that in controls(13.0% vs 24.5%, x(2);=8.681, P<0.05, RR=0.460). (3) The gene frequency of HLA-DQB1*0201 in pSS patients was significantly higher than that in controls(28.5% vs 18.5%, x(2);=5.563, P<0.05, RR=1.756).
CONCLUSION: In Han nationality of Shanxi province, HLA-DQA1*0501 and HLA-DQB1*0201 alleles probably are susceptible genes of pSS, while HLA-DQA1*0301/2 allele probably is a protective gene of pSS.