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Purpose To explore the role and effects of the single-nucleotide polymorphisms (SNPs) of the two functionally related indoleamine 2,3-dioxygenase (IDO) isoforms on IDO activity in the Chinese Han ethnic population. Methods A total of 151 consecutive patients of Chinese Han ethnicity (99 men and 52 women; average age 51.92 ± 18.26 years) with pulmonary TB admitted to Beijing Chest Hospital between July 2016 and February 2017 were enrolled in the study. The serum levels of tryptophan (Trp) and its metabolites,  IDO1  and  IDO2  mRNA levels, and the relationship of  IDO1  and  IDO2  SNPs with the serum Kyn/Trp ratio in TB patients and healthy controls were examined by LC/ESI–MS/MS analysis. Genomic DNA was isolated from whole blood, and the PCR products were sequenced and analyzed. Results In Chinese Han participants, only  IDO2  had SNPs R248W and Y359X that affected IDO activity, as determined by the serum Kyn/Trp ratio.  IDO1  and  IDO2  mRNA levels were inversely related in TB patients and healthy controls. Conclusions IDO2  SNPs and the opposite expression pattern of  IDO1  and  IDO2  affected IDO activity in Chinese Han TB patients.

Single-nucleotide polymorphisms and activities of indoleamine 2,3-dioxygenase isoforms, IDO1 and IDO2, in tuberculosis patients