Variations in postnatal maternal care and the epigenetic regulation of metabotropic glutamate receptor 1 expression and hippocampal function in the rat
Open accessAbstract
Variations in maternal care in the rat affect hippocampal morphology and function as well as performance on hippocampal-dependent tests of learning and memory in the offspring. Preliminary genome-wide analyses of gene transcription and DNA methylation of the molecular basis for such maternal effects suggested differences in the epigenetic state and transcriptional activity of the Grm1 gene in the rat as a function of maternal care. Grm1 encodes the type I metabotropic glutamate receptor (mGluR1), and we found increased mGluR1 mRNA and protein in hippocampus from the adult offspring of mothers showing an increased frequency of pup licking/grooming (i.e., high-LG mothers) that was associated with a decrease in the methylation of Grm1 . ChIP assays showed increased levels of histone 3 lysine 9 acetylation and histone 3 lysine 4 trimethylation of Grm1 in hippocampus from the adult offspring of high-LG compared with low-LG mothers. These histone posttranslational modifications were highly correlated, and both associate inversely with DNA methylation and positively with transcription. Studies of mGluR1 function showed increased hippocampal mGluR1-induced long-term depression in the adult offspring of high-LG compared with low-LG mothers, as well as increased paired-pulse depression (PPD). PPD is an inhibitory feedback mechanism that prevents excessive glutamate release during high-frequency stimulation. The maternal effects on both long-term depression and PPD were eliminated by treatment with an mGluR1-selective antagonist. These findings suggest that variations in maternal care can influence hippocampal function and cognitive performance through the epigenetic regulation of genes implicated in glutamatergic synaptic signaling.
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- Authors
- Bagot, R. C., Zhang, T.-Y., Wen, X., Nguyen, T. T. T., Nguyen, H.-B., Diorio, J., Wong, T. P., & Meaney, M. J.
- Affiliations
- Douglas Mental Health University Institute (CA)
- Neuroscience Division, Douglas Mental Health University Institute, and
- Agency for Science, Technology and Research (SG)
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2012-10-08
- Volume
- 109
- Issue
- supplement_2
- Pages
- 17200-17207
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC3477397
- OpenAlex
- W2037112086
- Cited by
- 141
- References
- 12
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 3 · 2023: 9 · 2022: 6 · 2021: 8 · 2020: 25 · 2019: 9 · 2018: 7 · 2017: 13 · 2016: 8 · 2015: 21 · 2014: 16 · 2013: 12 · 2012: 1
- FWCI
- 8.20
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Canadian Institutes of Health Research
- Natural Sciences and Engineering Research Council of Canada
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- maternal care, metabotropic glutamate receptor 1, hippocampus, DNA methylation, histone modifications, H3K9 acetylation, H3K4 trimethylation, long-term depression, paired-pulse depression, epigenetic regulation, learning and memory, maternal effects
- MeSH terms
- Animals, Base Sequence, Behavior, Animal, DNA, Female, Gene Expression Regulation, Hippocampus, Histones, Male, Maternal Behavior, Molecular Sequence Data, Pregnancy, Promoter Regions, Genetic, RNA, Messenger, Long-Term Potentiation, Receptors, Metabotropic Glutamate, DNA Methylation, Rats, Long-Evans, Long-Term Synaptic Depression, Epigenesis, Genetic, Rats, Genome-Wide Association Study, Receptor, Metabotropic Glutamate 5
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