SLC22A1 and irritable bowel syndrome: Our results revealed that rs622342 located in SLC22A1 showed no significant differences between the TUN population and the EUR (N_ITA, C_ITA, S_ITA, TSI, and IBS) and AFR (YRI, LWK, ESN, GWD, MSL) populations (p > 0.05/4 × 14).