Associação entre o polimorfismo rs7700944 no gene TIM-4 e artrite reumatoide em Zahedan, sudeste do Irã

Correlations Between TIMD-4 Gene Variants and the Risk and Clinical Features of Rheumatoid Arthritis in a Chinese Population

Introduction

T-cell immunoglobulin and mucin domain-4 (TIMD-4) are likely to impact autoimmune diseases (e.g., rheumatoid arthritis (RA)). It is hypothesized here that TIMD-4 gene polymorphism is likely to display a correlation with the RA risk.

Methods

For examining the effect exerted by TIMD-4 genetic variant in the RA risk, a case–control study containing 379 RA cases and 432 healthy control groups in Chinese population was performed. This study conducted genotyping with the use of a custom-by-design 48-Plex single nucleotide polymorphism (SNP) Scan™ Kit. Blood serum conditions of TIMD-4 in RA cases and matched control groups were measured by enzyme-connected immunosorbent assay (ELISA).

Results

Our results demonstrated that the TIMD-4 rs7700944 polymorphism could increase the RA risk in Chinese population. According to stratification analyzing processes, the TIMD-4 rs7700944 polymorphism displayed the correlation to the elevated RA risk in the females, smokers and cases aged ≥55 years. Cross-over analyses also indicated that the combined effect of smoking or drinking and GA genotype of rs7700944 locus contributed to an elevated risk of RA. In addition, the TIMD-4 rs7700944 polymorphism was also related to RA cases with DAS ≥ 3.20, ESR ≥25.00 mm/h and positive anti-ccp. Moreover, compared with the control groups, the average expression level of TIMD-4 in the serum of RA cases was apparently increased.

Conclusion

In conclusion, the TIMD-4 rs7700944 polymorphism may increase the sensitivity to RA in Chinese population.

TIM-1 rs41297579 G>A (-1454) and TIM-4 rs7700944 gene polymorphisms as possible risk factor for rheumatoid arthritis: relation to activity and severity

This study was aimed to evaluate the impact of both TIM-1 rs41297579 G>A (-1454) and TIM-4 rs7700944 polymorphisms on susceptibility to rheumatoid arthritis (RA) in a cohort of Egyptian population and to evaluate for the first time their relation to activity, severity, disease-related disability and erosion. TIM-1 rs41297579 G>A (-1454) and TIM-4 rs7700944 gene polymorphisms were typed by RFLP for 128 patients with RA and 125 healthy controls. The A allele, A-containing genotypes (GA and AA) of the TIM-4 and GA haplotype were present with significant higher frequency in patients with RA than healthy controls (Pc  < 0.001). These findings suggest that the A allele, A-containing genotypes (GA and AA) and GA haplotype may be a susceptibility risk factor for RA [OR = 5.83 (3.6-9.4), OR = 9.41 (5.0-17.6) and OR = 4.21 (1.07-19.2), respectively]. No associations were found between TIM genotypes and disease activity, severity or presence of erosion. However, the RA patients with GA genotype of TIM-4 have higher grade of rheumatoid factor (RF) positivity (P = 0.018), and have worse disease-related disability (P = 0.007) and worse pain (0.025). TIM-4 rs7700944 and not TIM-1 rs41297579 G>A (-1454) is associated with RA in the present cohort of Egyptian and may be a risk factor for development of RA in Egyptian. Both SNPs have no effect on disease activity, severity or erosion. However, TIM-4 GA genotype is associated with higher grade of RF positivity and worse disease-related disability and pain.