PTPN22 and inflammatory bowel disease: Accordingly, In view of the discrepant data regarding the distribution of the risk alleles of PTPN22 R620W we tested for the first time the association of the polymorphism with the susceptibility to IBD in a cohort of Moroccan patients in order to determine quantitatively the risk of CD and UC with the rs2476601 variant under an allelic, recessive and dominant model.