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Delivery type not associated with global methylation at birth
Shama Virani1, Dana C Dolinoy, Sindhu Halubai
1Department of Pediatrics, The University of Michigan, Ann Arbor, MI, USA. vasantha@umich.edu.
Clinical Epigenetics
|June 12, 2012
Summary
Cesarean delivery (CD) is not linked to global DNA methylation changes compared to vaginal delivery (VD). This study found no association between birth type and epigenetic markers, suggesting other mechanisms influence long-term health outcomes.
Area of Science:
- Epigenetics
- Perinatal Medicine
- Genomics
Background:
- Cesarean delivery (CD) is linked to various later-life health issues, including respiratory and allergic conditions, and type 1 diabetes.
- Epigenetic gene regulation, particularly DNA methylation, is a proposed mechanism connecting early-life exposures like birth mode to long-term health.
- Previous studies on delivery type and global methylation had small sample sizes.
Purpose of the Study:
- To investigate the association between the mode of delivery (cesarean vs. vaginal) and global DNA methylation levels in a large birth cohort.
- To determine if birth by cesarean delivery is associated with altered epigenetic profiles at birth.
Main Methods:
- Cord blood DNA was collected and bisulfite-converted from a large birth cohort.
- Global methylation was assessed using the Luminometric Methylation Assay (LUMA) and a LINE-1 methylation assay.
- Statistical analyses were performed to compare methylation levels between cesarean and vaginal deliveries, adjusting for covariates.
Main Results:
- LUMA measurements showed significantly lower global methylation for total and planned cesarean deliveries compared to vaginal deliveries, but this association disappeared after adjusting for maternal age, smoking, and infant gender.
- No significant association was found between cesarean delivery (total, planned, or emergency) and LINE-1 methylation levels compared to vaginal delivery, even after multivariable adjustment.
- LUMA and LINE-1 methylation measurements were negatively correlated in the study population.
Conclusions:
- The mode of delivery (cesarean vs. vaginal) was not associated with global genomic methylation in this large birth cohort, even after accounting for key confounding factors.
- While cesarean delivery may influence later health outcomes, the findings suggest that changes in global DNA methylation are not the mediating mechanism.
- Further research is needed to explore other epigenetic or biological pathways through which birth mode might affect long-term health.
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