Tehran University of Medical Sciences Iranian Journal of Allergy, Asthma and Immunology 1735-1502 13 1 2014 02 15 19 25 EN Somayeh Ahmadlou Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Mohsen Akhiani Department of Rheumatology, Alborz Hospital, Karaj, Iran Ahmad Salimzadeh Rheumatology Research Center, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran Mohammad Keramatipour Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran 2015 10 16 The association of rs10818488 SNP located in TRAF1/C5 region with Rheumatoid Arthritis (RA), has been picked up by genome-wide association studies. Independent studies in different populations revealed inconsistent results. The aim of this study was to investigate the possible association of this SNP with RA in Iranian population. A total of 362 cases and 422 healthy controls were recruited in this study. Genomic DNA was extracted from whole blood and the genotyping was performed by PCR-RFLP (Polymerase Chain Reaction– estriction Fragment Length Polymorphism). A set of genotypes was confirmed by sequencing. Genotype and allele frequencies were compared between the case and control groups. Analysis indicated a higher frequency of A allele in cases, although the difference was not statistically significant (Chi-square=2.8, p=0.09). Comparison of genotype frequencies, revealed higher frequencies of AA and AG genotypes in case group but statistically the difference was not significant (Chi-square=2.72, p=0.25).  These findings suggest that the rs10818488 in TRAF1/C5 region is not associated with rheumatoid arthritis in Iranian population. https://ijaai.tums.ac.ir/index.php/ijaai/article/view/481 https://ijaai.tums.ac.ir/index.php/ijaai/article/download/481/356