Effects of 2,3',4,4'5-Pentachlorobiphenyl Exposure during Pregnancy on Maturation of Offspring Oocytes in Mice
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ABSTRACT:
PROVIDER: PRJNA551608 | ENA |
REPOSITORIES: ENA
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Project description:To investigate the effect of prenatal exposure of PCB118 on the maturation process of offspring mouse oocytes, we performed genome-wide transcriptome sequencing of mouse oocytes from each group,providing evidence for the effect of PCB118 exposure during pregnancy on the quality of offspring oocyte.
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Project description:Germline epigenetic programming, including genomic imprinting, substantially influences offspring development. Polycomb Repressive Complex 2 (PRC2) plays an important role in Histone 3 Lysine 27 trimethylation (H3K27me3)-dependent imprinting, loss of which leads to growth and developmental changes in mouse offspring. In this study, we show that offspring from mouse oocytes lacking the PRC2 protein Embryonic Ectoderm Development (EED) were initially developmentally delayed, characterised by low blastocyst cell counts and substantial growth delay in mid-gestation embryos. This initial developmental delay was resolved as offspring underwent accelerated fetal development and growth in late gestation resulting in offspring that were similar stage and weight to controls at birth. The accelerated development and growth in offspring from Eed-null oocytes was associated with remodelling of the placenta, which involved an increase in fetal and maternal tissue size, conspicuous expansion of the glycogen enriched cell population and delayed parturition. Despite placental remodelling and accelerated offspring fetal growth and development, placental efficiency and fetal blood glucose levels were low, and the fetal blood metabolome was unchanged. Moreover, while expression of the H3K27me3-imprinted gene and amino acid transporter Slc38a4 was increased, fetal blood levels of individual amino acids were similar to controls, indicating that placental amino acid transport was not enhanced. Genome-wide analyses identified extensive transcriptional dysregulation and DNA methylation changes in affected placentas, including a range of imprinted and non-imprinted genes. Together, while deletion of Eed in growing oocytes resulted in fetal growth and developmental delay and placental hyperplasia, our data indicate a remarkable capacity for offspring fetal growth to be normalised despite inefficient placental function and the loss of H3K27me3-dependent genomic imprinting.
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Project description:Purpose: to determine whether exposure to chronic low dose dioxin impacts pancreas physiology during pregnancy (dams) and/or pancreas development (offspring)
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Project description:Maternal exposures during pregnancy influence the risk of many chronic adult-onset diseases in the offspring. We investigated whether feeding pregnant rats a high fat (HF) or ethinyl-estradiol (EE2)-supplemented diet affects carcinogen-induced mammary cancer risk in daughters, granddaughters and great-granddaughters. Here we show that mammary tumorigenesis is higher in daughters and granddaughters of HF rat dams and in daughters, granddaughters and great-granddaughters of EE2 rat dams. Outcross experiments indicate that increased mammary cancer risk is transmitted to HF granddaughters equally through the female or male germlines, but it is only transmitted to EE2 granddaughters through the female germline. The effects of maternal EE2 exposure on offspring's mammary cancer risk are associated with alternations in the DNA methylation machinery and methylation patterns in mammary tissue of all three EE2 generations. We conclude that dietary and estrogenic exposures in pregnancy increase breast cancer risk in multiple generations of offspring, possibly through non-genetic means We examined the whole genome methylation status of both control and EE2-supplemented diet rats in three consecutive generations
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Project description:The proper mammalian oocytes maturation is recognized as reaching MII stage and accumulation of mRNA and proteins in cell cytoplasm following fertilization. The proper course of folliculogenesis and oogenesis is orchestrated with morphogenesis significantly influencing further zygote formation and embryos growth. This study was aimed to determinate new transcriptomic markers of porcine oocytes morphogenesis associated with cell maturation capacity. We used microarrays to detail the global programme of gene expression underlying changes before and after in vitro maturation of oocytes in sus scrofa
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2012-08-30 | E-GEOD-40478 | biostudies-arrayexpress
Project description:The aim of the study was to analyze the impact of choline intake during pregnancy and/or lactation on histological alternation and gene expression profile in the liver of NAFLD dam progeny. We hypothesized that offspring of mothers suffering from non-alcoholic fatty liver (NAFLD) is more prone to develop fatty liver, because of suboptimal intrauterine environment. The performed analyses included histological examination of liver tissue obtained from 24-day-old male rats, which were offspring of dams with fatty liver: provided with proper choline amount during pregnancy and lactation (NN), fed a choline-deficient diet during these both periods (DD), deprived with choline only during pregnancy (DN) or only during lactation (ND). The global gene expression profile was analyzed by using microarray approach (Affymetrix® Rat Gene 2.1 ST Array Strip).
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Project description:comparison of mature and immature human oocytes, the amount differed from 1 to 100 oocytes per experiment.
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