ABSTRACT
PURPOSE: The purpose of this review was to explore the effects of psychosocial stress from life trauma and racial discrimination on epigenetic aging. DESIGN: A systematic review of the last 10 years was conducted using four databases: PubMed/MEDLINE, Web of Science, PsychInfo, and CINAHL. METHODS: Articles were identified using the following terms: ([(DNA methylation) AND (epigenetic clock)] OR [(DNA methylation) AND (epigenetic age)]) AND (discrimination OR trauma)). Original research articles published in English measuring life trauma, post-traumatic stress, experience of discrimination, and epigenetic clocks or aging were analyzed using PRISMA guidelines. RESULTS: Ten articles met inclusion criteria. The study sample size ranged from 96 to 1163 and most study populations had a mean age under 50 and included predominantly White male participants. One study identified accelerated epigenetic aging associated with discrimination using Hannum's clock; 33% of studies evaluating life trauma reported epigenetic age acceleration using GrimAge or Horvath's clock; 25% of studies evaluating childhood trauma reported epigenetic age acceleration using Horvath's clock; and 71% of studies assessing post-traumatic stress observed epigenetic age acceleration with all clocks, while one study reported deceleration using Horvath's clock. CONCLUSIONS: The experiences of life trauma, post-traumatic stress, and discrimination may be associated with accelerated epigenetic aging that can be consistently detected using different epigenetic clocks. Additional studies inclusive of diverse populations and other psychosocial stressors are needed. RELEVANCE: Nursing scholars and other health scientists who utilize epigenetic age acceleration to assess health risks may need to consider including psychosocial stressors in their studies as covariates.
Subject(s)
Epigenesis, Genetic , Racism , Aging/genetics , DNA Methylation , Epigenomics/methods , Humans , Male , Stress, PsychologicalABSTRACT
BACKGROUND: Vaginal microbiome studies frequently report diversity metrics and communities of microbiomes associated with reproductive health outcomes. Reports of Streptococcus agalactiae (also known as Group B Streptococcus or GBS), the leading cause of neonatal infectious morbidity and mortality, are notably lacking from the studies of the vaginal microbiome, despite being a known contributor to preterm birth and other complications. Therefore, the purpose of this systematic review was to explore the frequency of GBS reporting in vaginal microbiome literature pertaining to pregnancy and to examine methodological bias that contributes to differences in species and genus-level microbiome reporting. Lack of identification of GBS via sequencing-based approaches due to methodologic or reporting bias may result incomplete understanding of bacterial composition during pregnancy and subsequent birth outcomes. METHODOLOGY: A systematic review was conducted following the PRISMA guideline. Three databases (PubMed, CINAHL, and Web of Science) were used to identify papers for review based on the search terms "vaginal microbiome", "pregnancy", and "16S rRNA sequencing". Articles were evaluated for methods of DNA extraction and sequencing, 16S region, taxonomy classification database, number of participants or vaginal specimens, and pregnancy trimester. RESULTS: Forty-five research articles reported employing a metagenomic approach or 16S approach for vaginal microbiome analysis during pregnancy that explicitly reported taxonomic composition and were included in this review. Less than 30% of articles reported the presence of GBS (N = 13). No significant differences in methodology were identified between articles that reported versus did not report GBS. However, there was large variability across research methods used for vaginal microbiome analysis and species-level bacterial community reporting. CONCLUSION: Considerable differences in study design and data formatting methods may contribute to underrepresentation of GBS, and other known pathogens, in existing vaginal microbiome literature. Previous studies have identified considerable variation in methodology across vaginal microbiome studies. This study adds to this body of work because in addition to laboratory or statistical methods, how results and data are shared (e.g., only analyzing genus level data or 20 most abundant microbes), may hinder reproducibility and limit our understanding of the influence of less abundant microbes. Sharing detailed methods, analysis code, and raw data may improve reproducibility and ability to more accurately compare microbial communities across studies.
ABSTRACT
Purpose: Although research has explored the effects of racism on mental health, few studies have investigated the effects of racism on physical health. In this study, we examined the influence of racial discrimination and race-related stress and coping on blood pressure within a cohort of Black/African American women. Methods: This was a secondary data analysis of 226 Black/African American women from the Intergenerational Impact of Genetic and Psychological Factors on Blood Pressure study. Experiences of racial discrimination and coping, measured by the Experiences of Discrimination scale and the Race-Related Events Scale, were analyzed in relation to systolic blood pressure (SBP) and diastolic blood pressure (DBP). Multiple linear regression was used to explore the interaction effect of coping and discrimination on blood pressure for both scales. Results: Age and elevated body mass index were associated with increased SBP and DBP, and low income was associated with increased DBP. Among individuals who reported no personal experience of discrimination, more active coping strategies were associated with higher DBP. There was no evidence of a relationship between type of coping strategies used and blood pressure among individuals who did report experiences of discrimination. Conclusion: Differences in coping strategy in response to racism were not found to have a significant moderating effect on DBP in Black/African American women.
