SP110 is a promising anti-Mycobacterium tuberculosis (MTB) gene. To investigate the effects of SP110 and its associated genes, i.e., MYBBP1A and RELA, on pathological progression of MTB infection, an association study with 424 patients of fresh pulmonary tuberculosis (PTB) and 424 healthy controls was performed. Moreover, classification and regression tree and multifactor dimensionality reduction were employed to explore the effects of gene-gene interactions on cavitary PTB. The results indicated that both the heterozygous genotype GC and homozygous genotype CC in rs3809849 had significant effects on the risk of PTB (OR 1.42, 95 % CI 1.06-1.92, p 0.019; OR 1.55, 95 % CI 1.04-2.33, p = 0.033, respectively), and heterozygous genotype CT in rs9061 also had similar effects (OR 1.43, 95 % CI 1.07-1.90, p = 0.014). The rs3809849 and rs9905742 in MYBBP1A were also significantly associated with cavitary PTB (p = 0.00046 and 0.039, respectively), while rs9061 in SP110 had no such association (p = 0.06931) except its significant association with non-cavitary PTB (p = 0.0093). The interaction of MYBBP1A and RELA had significant effect on cavitary PTB (OR 4.24, 95 % CI 1.44-12.49, p = 0.005). These suggest that MYBBP1A instead of SP110 may be a genetic risk factor for cavitary PTB and play important effects on its whole progress.
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