HLA-Ⅱ類基因與中國(guó)漢族人白癜風(fēng)及其臨床特征的相關(guān)性研究
[Abstract]:Background: vitiligo is a common pigmented dermatosis skin disease usually caused by selective destruction of melanocytes in the skin and hair. The incidence of vitiligo is from 0.1% to 2.9%, and there is a significant difference between different races and regions. There is a huge negative impact. Vitiligo occurs mostly in children or young people. About half of the patients are at the age of 20 years of age, so they are usually divided into early onset vitiligo (Early-onset vitiligo) and late onset vitiligo (Late-onset vitiligo). Clinical and epidemiological studies all indicate vitiligo follows. A multi gene genetic model. The pathogenesis of vitiligo is not yet clear. Some of the relevant hypotheses are mainly included in the theory of melanocyte self destruction, biochemistry, neural origin, autoimmunity and genetics. In the past more than 10 years, the autoimmunity theory mainly originated from the discovery of vitiligo in epidemiological studies. People and their relatives often accompany other autoimmune diseases such as autoimmune thyroid disease, rheumatoid arthritis, psoriasis, adult insulin dependent diabetes, malignant anemia, Addison's disease and systemic lupus erythematosus. Human leukocyte antigen (HLA) is currently recognized in the susceptibility of various autoimmune diseases. Some of the genetic factors associated with the pathogenesis of vitiligo are also mainly concentrated in the HLA system. In the previous study of vitiligo in different populations, most of them reported that the disease was associated with HLA-II genes, but few studies could obtain consistent evidence, which might be complicated with genetic effects, genes, and the complexity of the environment. Interaction, population stratification or genetic diversity among different populations. Through reanalysis of previous studies, it was found that in the HLA- class II gene, DRB1*07 has been shown to have a significant correlation with vitiligo in Chinese Han people. Interestingly, it is reported that the expression of HLA-DR is abnormal in the epidermis of the skin lesions of vitiligo, suggesting that there is an abnormal expression in the epidermis of the skin of vitiligo. It may play a role in the death of HLA-II gene restrictive melanocytes. Recently, some studies have found that individuals carrying HLA-II gene / haplotype are older, more susceptible to autoimmune diseases, and higher incidence of family history.
Objective: (1) to further explore the correlation between HLA-II gene and vitiligo in Chinese Han population. (2) to evaluate the genetic effect of HLA-II gene on the clinical characteristics of vitiligo in Chinese Han people.
Methods: using polymerase chain reaction (PCR) / sequence specific primers to explore the distribution of HLA-DRB1*07 alleles in 1178 patients with vitiligo and 1743 healthy controls, and to observe the differences in the clinical characteristics between the HLA-DRB1*07 allele positive vitiligo patients and the HLA-DRB1*07 negative patients.
Results: (1) the proportion of HLA-DRB1*07 positive in vitiligo cases was significantly higher than that in the control (40.75%vs.25.83%, OR:1.97,95%CI1.68-2.31, P=2.13 x 10-17). The frequency of DRB1*07 positive alleles in cases and controls was 0.20 and 0.13. in all cases of purpura wind, 480 cases were DRB1*07 diurnal. The 698 patients were DRB1*07 negative. In the case group, the average age of DRB1*07 diurnal patients was 25.57 + 14.45 years old, while the average age of DRB1*07 negative patients was 27.43 + 14.71 years (P=0.031). There was no significant difference between the male and female sex ratio in the DRB1*07 positive and negative two groups of vitiligo (P=0.099). (2) HLA-DRB1*07 positive vitiligo The median age of onset age of.HLA-DRB1*07 positive patients with vitiligo was 17 + 16 years older than that of DRB1*07 negative patients. The median of the onset age of HLA-DRB1*07 negative vitiligo patients was 19 + 18, and there was a significant difference between them (P=0.004). The frequency of early onset vitiligo in DRB1*07 positive patients It was also significantly higher in the negative patients (65.14%vs.55.59%, P=0.001, OR=1.49,95%CI1.17-1.90). (3) the incidence of family history of DRB1*07 positive vitiligo patients was higher than that of DRB1*07 negative patients. In the patients with DRB1*07 positive vitiligo, about 30.8% had family history, but only 23.6% of DRB1*07 negative patients had family history (OR=1.44.95%CI1). .11-1.87, P=0.006). (4) compared with DRB1*07 negative vitiligo patients, DRB1*07 positive patients had a higher frequency of autoimmune diseases (4.0%vs32%). However, the frequency difference between the two groups was not statistically significant (OR=1.27,95%CI0.68-2.37, P=0.458).
Conclusion: (1) there is a significant correlation between HLA-II gene and vitiligo in Chinese Han people. (2) there is a significant difference in the clinical characteristics of HLA-DRB1*07 positive patients with vitiligo in Chinese Han people and HLA*DRB1*07 negative patients. The incidence of disease in the patients with HLA-DRB1*07 positive vitiligo is earlier, and the incidence of family history is higher. (3) this study It is suggested that genetic factors related to autoimmune susceptibility may play an important role in the pathogenesis of some clinical features or subtypes of vitiligo.
【學(xué)位授予單位】:安徽醫(yī)科大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2012
【分類號(hào)】:R758.41
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