Unknown,Transcriptomics,Genomics,Proteomics

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Maternal folate depletion during early development and high fat feeding from weaning elicit similar changes in gene expression, but not in DNA methylation, in adult offspring (Gene expression data)

ABSTRACT: Scope: The âPredictive Adaptive Responseâ hypothesis suggests the in utero environment when mismatched with the post-natal environment can influence later life health. Underlying mechanisms are poorly understood, but may involve gene transcription changes, regulated via epigenetic mechanisms. Methods and Results: In a 2x2 factorial design, female C57Bl/6 mice were randomised to low or normal folate diets (0.4mg/ or 2mg folic acid/kg diet) prior to and during pregnancy and lactation with. At weaning, offspring were randomised to high or low fat diets at weaning. Genome-wide gene expression and promoter DNA methylation were measured using microarrays in adult male livers. Maternal folate depletion and high fat intake post-weaning influenced gene expression (1959 and 1612 genes respectively) and promoter DNA methylation (208 and 344 loci respectively) but changes in expression and methylation were poorly matched for both dietary interventions. Expression of 667 genes was altered in response to both maternal folate depletion and post-weaning high fat feeding. In addition, there was evidence that the combined dietary insult (i.e. maternal folate depletion followed by high fat post-weaning) exerted the largest expression change for most of these genes. Conclusion: Our observations align with, and provide evidence in support of a potential underlying mechanism for, the âPredictive Adaptive Responseâ hypothesis. Elucidation of these mechanisms may identify targets for interventions to mitigate effects of adverse nutrition exposures during early development on disease risk in later life.

ORGANISM(S): Mus musculus

SUBMITTER: Michiel Adriaens

PROVIDER: E-MTAB-4987 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Background: Consumption of high fat diets has negative impacts on health and well-being, some of which may be epigenetically regulated. Selenium and folate are two compounds which influence epigenetic mechanisms. We investigated the hypothesis that post-weaning supplementation with adequate levels of selenium and folate in mouse offspring fed a high fat, low selenium and folate diet during gestation and lactation will lead to epigenetic changes of potential importance for long-term health. Female offspring of mothers fed the experimental diet were either maintained on this diet (HF-low-low), or weaned onto a high-fat diet with sufficient levels of selenium and folate (HF-low-suf), for 8 weeks. Gene and protein expression, DNA methylation, and histone modifications were measured in colon and liver of female offspring. Results: Adequate levels of selenium and folate post-weaning affected gene expression in colon and liver of offspring, including decreasing Slc2a4 gene expression. Protein expression was only altered in the liver. There was no effect of adequate levels of selenium and folate on global histone modifications in the liver. Global liver DNA methylation was decreased in mice switched to adequate levels of selenium and folate, but there was no effect on methylation of specific CpG sites within the Slc2a4 gene in liver. Conclusions: Post-weaning supplementation with adequate levels of selenium and folate in female offspring of mice fed high-fat diets during gestation and lactation can alter global DNA methylation in liver. This may be one mechanism by which the negative effects of a poor diet during early life can be ameliorated. Further research is required to establish what role epigenetic changes play in mediating observed changes in gene and protein expression, and the relevance of these changes to health. Female wild type C57BL/6 mice (Animal Resource Centre, Western Australia) were fed a High Fat diet containing low levels of selenium and folate (HF-Low) for 7 days prior to mating with male C57BL/6 mice (Ruakura Small Animal Facility, Hamilton, New Zealand). Mothers were maintained on the HF-Low diet throughout gestation and lactation. Offspring of these female mice were randomly assigned to one of two different dietary treatments: either the same diet as the mothers (HF-Low), or a High Fat diet containing adequate selenium and folate (HF-Suf). At 12 weeks of age, mice were euthanized and colon and liver samples taken for microarray, proteomics, and DNA methylation analyses. Genomic DNA, total RNA and protein from whole colon and liver tissue was extracted using an AllPrepM-BM-. DNA/RNA/Protein mini kit (Qiagen, Cat number 80004). Colon and liver RNA from six female offspring on the HF-Low diet was compared with colon and liver RNA from six female offspring on the HF-Suf diet. All individual RNA samples were hybridized against a common reference RNA on separate arrays. The reference RNA was prepared by pooling in equimolar proportions RNA extracted from the intestine and liver of twelve female C57BL/6 mice, these being all of the mice from which samples were derived for microarray analysis in the current study.

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Maternal folate depletion during early development and high fat feeding from weaning elicit similar changes in gene expression, but not in DNA methylation, in adult offspring (Gene expression data)

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