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Transcriptome analysis of early pregnancy vitamin D status and spontaneous preterm birth.

ABSTRACT: Peripheral whole blood transcriptome profiles of pregnant women with normal pregnancy and spontaneous preterm birth from 10-18 weeks of gestational age enrolled in the Vitamin D Antenatal Asthma Reduction Trial (VDAART).

ORGANISM(S): Homo sapiens

PROVIDER: GSE142974 | GEO | 2020/02/10

REPOSITORIES: GEO

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Plasma proteomics in preterm birth and normal pregnancy

Project description:Maternal plasma samples collected longitudinally from pregnant women were profiled using SomaLogic aptamer-based assays in women with normal pregnancy and those who delivered preterm. DiagnosisGA is the gestational age at diagnosis with any disease indicated by the Group variable, and it is set to NA for normal pregnancies. In the Group variable, sPTD stands for spontaneous preterm delivery, and PPROM for preterm premature rupture of membranes. Additional longitudinal samples of the controls, including the two samples included herein, are also available and described in PMID: 28738067.

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Early Pregnancy Gene Expression Profiling of Women with Preeclampsia: The “Vitamin D Antenatal Asthma Reduction Trial” (VDAART) Study

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Transcriptome analysis of early pregnancy vitamin D status and spontaneous preterm birth.

Project description:Transcriptome analysis of early pregnancy vitamin D status and spontaneous preterm birth.

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Transcriptome analysis of early pregnancy vitamin D status and spontaneous preterm birth.

Project description:BackgroundWe conducted a literature review on the studies that investigated the relationship of preterm birth, including spontaneous preterm birth (sPTB), with vitamin D status. Overall, these studies demonstrated that the incidence of sPTB was associated with maternal vitamin D insufficiency in early pregnancy. However, the potential mechanisms and biological pathways are unknown.ObjectivesTo investigate early pregnancy gene expression signatures associated with both vitamin D insufficiency and sPTB. We further constructed a network of these gene signatures and identified the common biological pathways involved.Study designWe conducted peripheral blood transcriptome profiling at 10-18 weeks of gestation in a nested case-control cohort of 24 pregnant women who participated in the Vitamin D Antenatal Asthma Reduction Trial (VDAART). In this cohort, 8 women had spontaneous preterm delivery (21-32 weeks of gestation) and 17 women had vitamin D insufficiency (25-hydroxyvitamin D < 30 ng/mL). We separately identified vitamin D-associated and sPTB gene signatures at 10 to 18 weeks and replicated the overlapping signatures in the mid-pregnancy peripheral blood of an independent cohort with sPTB cases.ResultAt 10-18 weeks of gestation, 146 differentially expressed genes (25 upregulated) were associated with both vitamin D insufficiency and sPTB in the discovery cohort (FDR < 0.05). Of these genes, 43 (25 upregulated) were replicated in the independent cohort of sPTB cases and controls with normal pregnancies (P < 0.05). Functional enrichment and network analyses of the replicated gene signatures suggested several highly connected nodes related to inflammatory and immune responses.ConclusionsOur gene expression study and network analyses suggest that the dysregulation of immune response pathways due to early pregnancy vitamin D insufficiency may contribute to the pathobiology of sPTB.

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miRNA-Seq of human placenta: spontaneous preterm birth in the presence of intra-amniotic infection/inflammation and controls

Project description:Using RNA-sequencing (RNA-Seq and miRNA-Seq), we analyzed paired villous trophoblast and decidual basalis transcriptomes of 15 women pregnant with singleton gestations grouped as follows: (1) spontaneous preterm birth (PTB) in the setting of amniocentesis-proven intra-amniotic infection (IAI) and histological chorioamnionits (n=5; GA median [range]: 26 [25-31] weeks); (2) spontaneous idiopathic preterm birth (iPTB, n=5, GA: 32 [30-33] weeks); and (3) term normal pregnancy, that delivered a heathy infant by cesarean section in the absence of labor (n=5; GA: 39 [38-39] weeks). The primary goal of this study was to identify differentially expressed transcripts and illuminate molecular mechanisms distinguishing IAI-associated PTBs from spontaneous PTBs in the absence of IAI. We further compared iPTB specimens to term specimens to determine genes differentially regulated with advancing gestational age and following spontaneous PTB without IAI. Finally, we determined transcripts selectively expressed in either the villous trophoblast or decidua basalis in each clinical context. Raw data for this series are not available because consent forms do not allow for public access to raw data.

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Cord blood hematopoietic cells display altered DNA methylation patterns in preterm birth

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