Medicine and Health Sciences Commons^™

Impact Of Prenatal Stress On Offspring Glucocorticoid Levels: A Phylogenetic Meta-Analysis Across 14 Vertebrate Species, Zaneta M. Thayer, Meredith A. Wilson, Andrew W. Kim, Adrian V. Jaeggi

Dartmouth Scholarship

Prenatal exposure to maternal stress is commonly associated with variation in Hypothalamic Pituitary Adrenal (HPA)-axis functioning in ofspring. However, the strength or consistency of this response has never been empirically evaluated across vertebrate species. Here we meta-analyzed 114 results from 39 studies across 14 vertebrate species using Bayesian phylogenetic mixed-efects models. We found a positive overall efect of prenatal stress on ofspring glucocorticoids (d’=0.43) though the 95% Highest Posterior Density Interval overlapped with 0 (−0.16–0.95). Meta-regressions of potential moderators highlighted that phylogeny and life history variables predicted relatively little variation in efect size. Experimental studies (d’=0.64) produced stronger efects than …

Caesarean Sections And For-Profit Status Of Hospitals: Systematic Review And Meta-Analysis, Ilir Hoxha, Lamprini Syrogiannouli, Xhyljeta Luta, Kali Tal, David C. Goodman

Dartmouth Scholarship

Objective: Financial incentives may encourage private for-profit providers to perform more caesarean section (CS) than non-profit hospitals. We therefore sought to determine the association of for-profit status of hospital and odds of CS.

Design: Systematic review and meta-analysis. Data sources: MEDLINE, EMBASE and the Cochrane Database of Systematic Reviews from the first year of records through February 2016. Eligibility criteria: To be eligible, studies had to report data to allow the calculation of ORs of CS comparing private for-profit hospitals with public or private non-profit hospitals in a specific geographic area. Outcomes: The prespecified primary outcome was the adjusted OR …

Maternal Arsenic Exposure And Gestational Diabetes And Glucose Intolerance In The New Hampshire Birth Cohort Study, Shohreh F. Farzan, Anala Gossai, Yu Chen, Lisa Chasan-Taber, Emily Baker, Margaret Karagas

Dartmouth Scholarship

Background: Gestational diabetes mellitus (GDM) is a major pregnancy complication with detrimental effects for both mothers and their children. Accumulating evidence has suggested a potential role for arsenic (As) exposure in the development of GDM, but current studies have not assessed As exposure from water, urine or toenail samples.

Methods: We investigated the association between As exposure and risk of glucose intolerance and GDM among 1151 women enrolled in the New Hampshire Birth Cohort Study. Arsenic was measured in home well water and via biomarkers (i.e., maternal urine collected ~24–28 weeks gestation and toenail clippings collected 2 weeks postpartum).

Results: …

Two Novel Genetic Variants In The Mineralocorticoid Receptor Gene Associated With Spontaneous Preterm Birth, Inge Christiaens, Q. Wei Ang, Lindsay N. Gordon, Xin Fang, Scott Williams

Dartmouth Scholarship

Background: Preterm birth is the leading cause of mortality and morbidity in newborn infants. Its etiology is multifactorial with genes and environmental factors, including chronic maternal stress, contributing to its risk. Our objective was to investigate whether single nucleotide polymorphisms (SNPs) in genes involved in the stress response are associated with spontaneous preterm birth using a candidate gene approach.

Methods: A total of 210 cases (singleton spontaneous preterm birth at <37 >weeks) and 412 controls (singleton term birth at 38–42 weeks without a history of preterm birth) were studied. High quality maternal DNA was available from saliva samples of 190 cases …

Preliminary Analysis Of In Utero Low-Level Arsenic Exposure And Fetal Growth Using Biometric Measurements Extracted From Fetal Ultrasound Reports, Matthew A. Davis, John Higgins, Zhigang Li, Diane Gilbert-Diamond, Emily R. Baker, Amar Das, Margaret R. Karagas

Dartmouth Scholarship

Background: Early life exposure to arsenic is associated with decreased birth weight in highly exposed populations but little is known about effects of low-level arsenic exposure on growth in utero.

Methods: Using a sample of 272 pregnancies from New Hampshire we obtained biometric measurements directly from fetal ultrasound reports commonly found in electronic medical records. We used information extraction methods to develop and validate an automated approach for mining biometric measurements from the text of clinical reports. As a preliminary analysis, we examined associations between in utero low-level arsenic exposure (as measured by maternal urinary arsenic concentration) and fetal growth …

Why 'Down Under' Is A Cut Above: A Comparison Of Rates Of And Reasons For Caesarean Section In England And Australia, Samantha J. Prosser, Yvette D. Miller, Rachel Thompson, Maggie Redshaw

Dartmouth Scholarship

Background: Most studies examining determinants of rising rates of caesarean section have examined patterns in documented reasons for caesarean over time in a single location. Further insights could be gleaned from cross-cultural research that examines practice patterns in locations with disparate rates of caesarean section at a single time point.

Methods: We compared both rates of and main reason for pre-labour and intrapartum caesarean between England and Queensland, Australia, using data from retrospective cross-sectional surveys of women who had recently given birth in England (n = 5,250) and Queensland (n = 3,467).

Birth Control: To What Extent Do Women Report Being Informed And Involved In Decisions About Pregnancy And Birth Procedures?, Rachel Thompson, Yvette D. Miller

Dartmouth Scholarship

Background: Health policy, guidelines, and standards advocate giving patients comprehensive information and facilitating their involvement in health-related decision-making. Routine assessment of patient reports of these processes is needed. Our objective was to examine decision-making processes, specifically information provision and consumer involvement in decision-making, for nine pregnancy, labour, and birth procedures, as reported by maternity care consumers in Queensland, Australia.

Methods: Participants were women who had a live birth in Queensland in a specified time period and were not found to have had a baby that died since birth, who completed the extended Having a Baby in Queensland Survey, 2010 about …

Developmental Genes Targeted For Epigenetic Variation Between Twin-Twin Transfusion Syndrome Children, Carmen J. Marsit, Devin C. Koestler, Debra Watson-Smith, Charlotte M. Boney

Dartmouth Scholarship

Background: Epigenetic mechanisms are thought to be critical in mediating the role of the intrauterine environment on lifelong health and disease. Twin-twin transfusion syndrome (TTTS) is a rare condition wherein fetuses share the placenta and develop vascular anastomoses, which allow blood to flow between the fetuses. The unequal flow results in reciprocal hypo- and hypervolemia in the affected twins, striking growth differences and physiologic adaptations in response to this significant stressor. The donor twin in the TTTS syndrome can be profoundly growth restricted and there is likely a nutritional imbalance between the twins. The consequences of TTTS on fetal programming …

Breast Milk From Tanzanian Women Has Divergent Effects On Cell-Free And Cell-Associated Hiv-1 Infection In Vitro, Magdalena A. Lyimo, Matilda Ngarina Mosi, Molly L. Housman, Muhammad Zain-Ul-Abideen, Frederick V. Lee, Alexandra L. Howell, Ruth I. Connor

Dartmouth Scholarship

Transmission of HIV-1 during breastfeeding is a significant source of new pediatric infections in sub-Saharan Africa. Breast milk from HIV-positive mothers contains both cell-free and cell-associated virus; however, the impact of breast milk on HIV-1 infectivity remains poorly understood. In the present study, breast milk was collected from HIV-positive and HIV-negative Tanzanian women attending antenatal clinics in Dar es Salaam. Milk was analyzed for activity in vitro against both cell-free and cell-associated HIV-1. Potent inhibition of cell-free R5 and X4 HIV-1 occurred in the presence of milk from all donors regardless of HIV-1 serostatus. Inhibition of cell-free HIV-1 infection positively …

Let-7 Expression Defines Two Differentiation Stages Of Cancer, Scott Shell, Sun-Mi Park, Amir Reza Radjabi, Robert Schickel, Emily Kistner, David Jewell

Dartmouth Scholarship

The early phases of carcinogenesis resemble embryonic development, often involving the reexpression of embryonic mesenchymal genes. The NCI60 panel of human tumor cell lines can genetically be subdivided into two superclusters (SCs) that correspond to CD95 Type I and II cells. SC1 cells are characterized by a mesenchymal and SC2 cells by an epithelial gene signature, suggesting that SC1 cells represent less differentiated, advanced stages of cancer. miRNAs are small 20- to 22-nucleotide-long noncoding RNAs that inhibit gene expression at the posttranscriptional level. By performing miRNA expression analysis on 10 Type I and 10 Type II cells, we have determined …