Genetic Case-Control Study for Eight Polymorphisms Associated with Rheumatoid Arthritis.

Area of Science:

• Genetics
• Immunology
• Rheumatology

Background:

• Rheumatoid arthritis (RA) is a prevalent autoimmune disease with substantial socioeconomic consequences.
• Identifying genetic factors contributing to RA susceptibility is crucial for understanding disease mechanisms and developing targeted therapies.

Purpose of the Study:

• To investigate eight candidate RA susceptibility loci and identify associated single nucleotide polymorphisms (SNPs) in the Egyptian population.
• To analyze the association of specific SNPs (MTHFR, TGFB1, TNFB, VDR) with RA risk in Egyptians.

Main Methods:

• Genotyping of eight SNPs (MTHFR-C677T/A1298C, TGFB1 T869C, TNFB A252G, VDR-ApaI/BsmI/FokI/TaqI) in 105 RA patients and 80 controls.
• Association analysis using multiplicative, dominant, recessive, and co-dominant models.
• Linkage disequilibrium (LD) analysis for VDR SNPs.

Main Results:

• TNFB, VDR-BsmI, and VDR-TaqI SNPs showed significant association with RA across all tested models.
• MTHFR C677T was associated with RA except in the recessive model.
• TGFB1, MTHFR A1298C, and VDR-ApaI showed associations under specific models (dominant, co-dominant, recessive).
• VDR-FokI showed no significant association with RA.
• High LD was observed between VDR-BsmI and VDR-FokI, but with poor correlation.

Conclusions:

• Several studied SNPs, including those in TNFB, MTHFR, TGFB1, and VDR (ApaI, BsmI, TaqI), potentially contribute to RA susceptibility in the Egyptian population.
• VDR-FokI SNP was not found to be associated with RA in this cohort.
• These findings highlight specific genetic markers relevant to RA in Egyptians, warranting further investigation.