Allelic discrimination assays were used to genotype patients and controls for five susceptibility variants: NOD2 SNPs rs2066844 (assay ID: C-11717468_20), rs2066845 (assay ID: C_11717466_20), and rs2066847 (custom assay); ATG16L1 SNP rs2241880 (assay ID: C_9095577_20); and IRGM SNP rs10065172 (assay ID: C_30593568_10). These SNPs were analyzed using real-time PCR as recommended by the manufacturer (Applied Biosystems, USA). Reactions were carried out using a LightCycler 480 Systems (Roche). An initial denaturation step was performed at 95°C for 10 min, followed by 40 cycles of 92°C for 15 s and 1 min at 60°C.
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