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Polymorphism of protein tyrosine phosphatase non‐receptor type 22 and protein arginine deiminase 4 gene among Ghanaian rheumatoid arthritis patients: A case–control study

Rheumatoid arthritis (RA) is an autoimmune disease which affects millions of lives globally characterized by chronic inflammation in the joints of the body. There is no known cause for RA; however, genetic predisposition has been associated with its occurrence. The association between genetic predisposition and RA has been reported largely among Caucasians and Asians. However, few studies with limited data have reported genome‐wide association studies of RA in Africa, especially in Ghana. In addition, there is genetic heterogeneity that exists geographically among different populations. This study therefore investigated the association of protein arginine deiminase type 4 (PAD4) and protein tyrosine phosphatase non‐receptor type 22 (PTPN22) single nucleotide polymorphisms with susceptibility of RA among Ghanaians.