DNA Methylation Patterns of Glucocorticoid Pathway Genes in Preterm Birth Among Black Women

Influence of Mother-Father Relationship on Perceived Stress among Black Pregnant Women

BACKGROUND

Perceived stress during pregnancy has been associated with adverse maternal health and birth outcomes. Compared to White pregnant women, Black pregnant women in the United States report higher levels of perceived stress and experience higher rates of maternal mortality and preterm birth. Mother-father relationship has been associated with perceived stress among pregnant women, though literature among Black pregnant women is limited.

OBJECTIVE

We aimed to examine the associations of mother-father relationship with perceived stress among Black pregnant women.

METHODS

Using a cross-sectional, correlational design, we conducted a secondary analysis of data obtained from 418 Black pregnant women enrolled in the Biosocial Impact on Black Births study. Participants completed questionnaires between 19- and 29 weeks gestation with items related to maternal characteristics, measures of the mother-father relationship, including the level of contact, involvement, closeness, support, and conflict with the father of the baby (FOB), and maternal perceived stress.

RESULTS

Participants who reported lower levels of support (ρ[416] = -0.279, P < .001) and higher levels of conflict (ρ[416] = 0.401, P < .001) with the FOB also reported higher levels of perceived stress. Levels of involvement, closeness, support, and conflict with FOB also predicted levels of maternal perceived stress after controlling for covariates.

CONCLUSIONS

These findings suggest that the mother-father relationship significantly influences perceived stress among Black pregnant women, thus warranting further study and intervention.

Preterm Birth in African American Women: A Multi-Omic Pilot Study in Early Pregnancy

Preterm birth (PTB; <37 weeks completed gestation) is a devastating problem affecting over 13 million live births worldwide. In the U.S., African Americans experience significantly higher rates of PTB compared to non-Hispanic Whites. PTB disparities have been linked to social determinants of health (e.g., socioeconomic status, discrimination). However, the biological underpinnings related to these associations are unclear. DNA methylation (DNAm) is subject to environmental influences, and DNAm modifications are known to affect gene expression. Using a multi-omic approach, we examined differences in combined DNA methylation (DNAm) and messenger RNA (mRNA) transcriptomic data from 20 pregnant African American women (12 PTB; 8 term birth) early in pregnancy (8-18 weeks gestation). We found that the HLA-DQB2 gene was both differentially methylated (cg12296550; p = .02) and differentially expressed (p = .014; log2FC = 2.5) between women with PTB and term birth. Gene expression analysis showed HLA-DQB2 and HLA-DRB4 (p = .028; log2FC = -3.6) were the two most highly expressed genes. HLA-DQB2 expressed higher in PTB and HLA-DRB4 expressed higher in term birth. However, no genes remained significant (p < .05) after Bonferroni correction. HLA-DRB4 and AKR1C1 were identified as a potential biomarkers in dimensionality reduction models and are also important to immune function and allogenic breakdown. Altered gene expression may lead to inflammatory imbalances or allogenic intolerance resulting in PTB. This study provides proof-of-concept evidence for the feasibility and importance of future multi-omics studies with larger populations to further explore the genes and pathways identified here.

A Mixed Methods Approach to Understand Mother-Father Relationship and Perceived Stress Among Black Pregnant Women

BACKGROUND

Black women in the United States report moderate to high levels of perceived stress during pregnancy. Though lower levels of involvement and support from father of the baby (FOB) and higher levels of conflict have been associated with higher levels of maternal perceived stress, it is not clear how Black pregnant women experience the mother-father relationship and its influence on perceived stress.

PURPOSE

To examine and describe the mother-father relationship and its role in experiences of perceived stress from the perspective of Black pregnant women.

METHODS

Using a convergent, mixed methods approach with ideal-type analysis, we conducted a secondary analysis of data among 60 Black pregnant women enrolled in the Biosocial Impact on Black Births study. Women completed online self-report questionnaires and participated in a semi-structured interview by telephone.

RESULTS

Participants who reported more conflict with FOB also reported higher levels of perceived stress (ρ(47) = .431, P= .002). Themes (importance, communication, support, conflict, satisfaction, and stress) emerged from the data. Five distinct mother-father relationship typologies were identified following an ideal-type analysis of the combined dataset: Cared For; Managing Expectations; Just Friends, For the Kids; It's Complicated; and Can't be Bothered.

CONCLUSIONS

These findings are an innovative exemplar of ideal-type analysis and provide a deeper understanding of the nuance and dynamics within the mother-father relationship and how it influences perceived stress among Black pregnant women.

IMPLICATIONS

Clinicians must recognize the significance of the mother-father relationship and, when appropriate, encourage paternal involvement or intervene if there is conflict during pregnancy.

Epigenetic Responses to Nonchemical Stressors: Potential Molecular Links to Perinatal Health Outcomes

PURPOSE OF REVIEW

We summarize the recent literature investigating exposure to four nonchemical stressors (financial stress, racism, psychosocial stress, and trauma) and DNA methylation, miRNA expression, and mRNA expression. We also highlight the relationships between these epigenetic changes and six critical perinatal outcomes (preterm birth, low birth weight, preeclampsia, gestational diabetes, childhood allergic disease, and childhood neurocognition).

RECENT FINDINGS

Multiple studies have found financial stress, psychosocial stress, and trauma to be associated with DNA methylation and/or miRNA and mRNA expression. Fewer studies have investigated the effects of racism. The majority of studies assessed epigenetic or genomic changes in maternal blood, cord blood, or placenta. Several studies included multi-OMIC assessments in which DNA methylation and/or miRNA expression were associated with gene expression. There is strong evidence for the role of epigenetics in driving the health outcomes considered. A total of 22 biomarkers, including numerous HPA axis genes, were identified to be epigenetically altered by both stressors and outcomes. Epigenetic changes related to inflammation, the immune and endocrine systems, and cell growth and survival were highlighted across numerous studies. Maternal exposure to nonchemical stressors is associated with epigenetic and/or genomic changes in a tissue-specific manner among inflammatory, immune, endocrine, and cell growth-related pathways, which may act as mediating pathways to perinatal health outcomes. Future research can test the mediating role of the specific biomarkers identified as linked with both stressors and outcomes. Understanding underlying epigenetic mechanisms altered by nonchemical stressors can provide a better understanding of how chemical and nonchemical exposures interact.