HLA-DR基因与中国南方汉族部分人群肺结核易感基因的研究

目的　探讨人类白细胞抗原 (HLA) DR基因与中国南方汉族部分人群肺结核发病的关联性 ,并寻找与肺结核发病可能相关的HLA易感基因。方法　采用病例 对照的研究方法 ,应用聚合酶链反应 序列特异性引物 (PCR SSP)技术对 110例中国南方汉族肺结核患者 (肺结核病例组 )和 10 1例中国南方汉族健康对照者 (健康对照组 )的 2 3个HLA DR等位基因进行分型 ,比较其等位基因频率(GF)并计算其比值比 (OR)。结果　HLA DR基因PCR SSP分型显示 :(1)肺结核病例组中的DR16等位基因的基因频率显著高于健康对照组 ,两组的GF值分别为 12 6 2 %、5 6 0 % ,两者之间差异具有显著性 (χ2 =5 915 ,PC<0 0 5 ,OR值为 2 5 3)。 (2 )肺结核病例组中的DR1、DR13 3等位基因的基因频率分别为 8 0 8%、2 3 5 7% ,显著低于健康对照组的 2 9 2 9%、5 0 2 4 % ,两组比较 ,差异具有显著性 (χ2值分别为 17 84 7和 14 2 5 8,PC 值均 <0 0 1;OR值分别为 0 2 6、0 33)。结论　 (1)DR16等位基因与南方汉族部分人群的肺结核发病可能密切相关 ,或与真正起作用的易感基因连锁。 (2 )中国南方汉族部分人群DR1、DR13 3等位基因的表达对结核分枝杆菌感染者的发病可能具有拮抗作用。

A study on the correlation between HLA-DR genes and susceptibility to pulmonary tuberculosis in a population of Han nationality from southern China

OBJECTIVE: To analyze the association between HLA-DR genes and pulmonary tuberculosis and to explore susceptible genes associated with pulmonary tuberculosis in a population of Han nationality from southern China. METHODS: Using case-control study, we detected by polymerase chain reaction-sequence specific primers (PCR-SSP) technique the 23 alleles of HLA-DR gene sites in 110 tuberculosis cases and 101 controls from Guangdong, Guangxi, Hunan, Hubei, Jiangxi and Fujian provinces. Gene frequency (GF) and odds ratio (OR) were calculated and compared. RESULTS: The frequency of DR16 allele in pulmonary tuberculosis cases was strikingly higher than that in the healthy controls (chi2=5.915, Pc< 0.05). Their GFs were 12.62% and 5.60% respectively, and the OR was 2.53. Significantly decreased frequency of DR1 and DR13.3 alleles in cases were found (chi2 values were 17.847 and 14.258 respectively, Pc < 0.01). Their ratios of GFs were 8.08% vs. 23.57% and 29.29% vs. 50.24%, and their ORs were 0.26 and 0.33 respectively. CONCLUSIONS: The results suggest that DR16 allele is closely correlated to incidence of pulmonary tuberculosis in this population of Han nationality from southern China, or linked to susceptible genes which are functional. It is also suggested that expression of DR1 and DR13.3 alleles may be associated with an antagonist effect in the pathogenesis of pulmonary tuberculosis in this population.