Related Experiment Videos
Causal Interplay Between Platelet Indices and Rheumatoid Arthritis: Genetic Evidence From Bidirectional Mendelian
Xu-Yan Shen1, Jia-Ying Sun1, Xin Wang1
1Department of Rheumatology and Immunology, Shaoxing People's Hospital, Shaoxing, Zhejiang Province, China.
International Journal of Genomics
|July 31, 2026
Summary
Genetically determined plateletcrit (PCT) increases rheumatoid arthritis (RA) risk. Conversely, RA genetic susceptibility is linked to lower mean platelet volume (MPV), offering insights into platelet roles in RA.
Area of Science:
- Genetics
- Rheumatology
- Hematology
Background:
- Rheumatoid arthritis (RA) is a chronic autoimmune disease.
- Platelet indices (PIs) are potential biomarkers in RA pathogenesis.
- Understanding genetic links between PIs and RA is crucial.
Purpose of the Study:
- To investigate genetically causal associations between platelet indices and rheumatoid arthritis.
- To explore bidirectional causality using Mendelian randomization.
Main Methods:
- Two-sample Mendelian randomization (TSMR) analysis.
- Utilized genetic summary statistics from large consortia (Neale Lab, FinnGen, MRC-IEU).
- Employed inverse-variance weighted (IVW), weighted median (WM), and MR-Egger methods with sensitivity analyses.
Main Results:
- Plateletcrit (PCT) showed a causal association with increased RA risk (OR=1.13, p=0.012) and seropositive RA (OR=1.03, p=0.003).
- Reverse MR analysis indicated RA genetic susceptibility causally linked to decreased mean platelet volume (MPV) (Beta=-0.012, p=0.037).
- Sensitivity analyses confirmed the reliability of causal estimates.
Conclusions:
- A positive causal relationship exists between PCT and RA risk.
- Genetic susceptibility to RA is causally associated with reduced MPV.
- Findings provide a basis for exploring platelet mechanisms in RA pathogenesis.
Related Concept Videos
01:11Genome-wide Association Studies-GWAS
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
GWAS does not require the identification of the target gene involved in...
01:20The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...