[Relationship between Gene Polymorphism of HLA-A(*)/-B(*)-DRB1(*) and Aplastic Anemia in Chinese Han Population of Northwestern Plateau].

Objective: To investigate the correlation between the HLA genes and pathogenesis of aplastic anemia (AA), so as to find the susceptible AA genes.

Methods: Polymerase chain reaction with specific sequence primers (PCR-SSP) method was used to detect the HLA typing of 50 AA patients and 183 normal healthy individuals as controls in Chinese Han population of northwestern plateau.

Results: The frequency of HLA-A* 0201 (45.0%), B* 1501 (11.0%), B* 5501 (9.0%) and DRB1* 0901 (19.0%) gene frequences in AA patients were significantly higher than those in controls (Odds Ratio: OR=1.657, 2.138, 2.314 and 1.932, x2=4.882, 3.876, 3.863 and 4.473 (P<0.05). In contrast, A* 0301 gene frequency (4.0%) in AA was significantly lower than that in controls, OR=0.349, x2=4.154 (P<0.05). The male HLA-A* 0201 gene frequency was lower than that in female (38.2% vs 59.4%), and the difference was statistically significant (P<0.05). Concludsion: The HLA-A* 0201, B* 1501, B* 5501 and DRB1* 0901 genes may be considered as the risk markers while A* 0301 gene as a protective marker of AA, the HLA-A* 0201 also shows the sex differences.