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Causal Relationship Between Migraine and Postpartum Depression: A Two-Sample Bidirectional Mendelian Randomization
Xian-Jin Zhou1,2, Rui Chen3, Yu-Ming Niu4,5
1School of Gongli Hospital Medical Technology, University of Shanghai for Science and Technology, Shanghai, People's Republic of China.
Background:
The possible causative relationship between migraine and postpartum depression (PPD) is examined in this study. Prior research has shown a strong correlation between the two conditions, but the exact cause is unknown.
Methods:
A bidirectional Mendelian randomization (MR) approach was employed to assess causality, utilizing discovery and replication samples from publicly available genome-wide association study (GWAS) datasets. Causal effects were estimated using the inverse-variance weighted (IVW) method, MR-Egger regression, and three additional MR approaches. Sensitivity analyses, including tests for heterogeneity, horizontal pleiotropy, and leave-one-out analysis, were conducted to evaluate the robustness of the findings.
Results:
Overall, no significant causal effect of migraine on PPD risk was identified in either the discovery (IVW: OR=1.018; 95% CI=0.928-1.117; P=0.706) or replication analysis (IVW: OR=2.097; 95% CI=0.328-13.409; P=0.434) in forward MR analysis. Similarly, no causal effect of migraine on PPD was observed in female-only analyses. Moreover, reverse MR analysis found no significant causal effect of PPD on migraine risk in discovery (IVW: OR=1.036; 95% CI=0.999-1.075; P=0.057) or replication (IVW: OR=1.001; 95% CI=1.000-1.002; P=0.274) analysis, and no causal effect was observed in female-only analyses. No evidence of heterogeneity or horizontal pleiotropy was detected in sensitivity tests.
Conclusion:
The current MR study indicates no significant causal relationship between migraine and PPD.
Insights
This study found no evidence that migraine causes postpartum depression (PPD) or that PPD causes migraine. Mendelian randomization analysis confirmed no significant causal link between these two conditions.
Area of Science:
- Neuroscience
- Psychiatry
- Genetics
Background:
- Migraine and postpartum depression (PPD) are frequently correlated, yet their causal relationship remains unclear.
- Previous research indicates a strong association, necessitating further investigation into causality.
- Understanding the etiological link is crucial for effective prevention and treatment strategies.
Purpose of the Study:
- To investigate the potential causal relationship between migraine and postpartum depression (PPD).
- To determine if migraine predisposes individuals to PPD or if PPD increases migraine risk.
- To utilize genetic data for robust causal inference.
Main Methods:
- Employed a bidirectional Mendelian randomization (MR) approach using genome-wide association study (GWAS) data.
- Utilized discovery and replication samples for robust analysis.
- Applied inverse-variance weighted (IVW) and MR-Egger regression, with sensitivity analyses for heterogeneity and pleiotropy.
Main Results:
- No significant causal effect of migraine on PPD risk was found in discovery or replication analyses.
- Reverse MR analysis also revealed no significant causal effect of PPD on migraine risk.
- Sensitivity analyses confirmed the absence of heterogeneity and horizontal pleiotropy.
Conclusions:
- This Mendelian randomization study provides no evidence for a causal relationship between migraine and PPD.
- The findings suggest that the observed correlation may not be due to a direct causal link.
- Further research may explore shared underlying factors or non-causal associations.
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