title: Maternal stress induces epigenetic signatures of psychiatric and neurological diseases in the offspring.
abstract: The gestational state is a period of particular vulnerability to diseases that affect maternal and fetal health. Stress during gestation may represent a powerful influence on maternal mental health and offspring brain plasticity and development. Here we show that the fetal transcriptome, through microRNA (miRNA) regulation, responds to prenatal stress in association with epigenetic signatures of psychiatric and neurological diseases. Pregnant Long-Evans rats were assigned to stress from gestational days 12 to 18 while others served as handled controls. Gestational stress in the dam disrupted parturient maternal behaviour and was accompanied by characteristic brain miRNA profiles in the mother and her offspring, and altered transcriptomic brain profiles in the offspring. In the offspring brains, prenatal stress upregulated miR-103, which is involved in brain pathologies, and downregulated its potential gene target Ptplb. Prenatal stress downregulated miR-145, a marker of multiple sclerosis in humans. Prenatal stress also upregulated miR-323 and miR-98, which may alter inflammatory responses in the brain. Furthermore, prenatal stress upregulated miR-219, which targets the gene Dazap1. Both miR-219 and Dazap1 are putative markers of schizophrenia and bipolar affective disorder in humans. Offspring transcriptomic changes included genes related to development, axonal guidance and neuropathology. These findings indicate that prenatal stress modifies epigenetic signatures linked to disease during critical periods of fetal brain development. These observations provide a new mechanistic association between environmental and genetic risk factors in psychiatric and neurological disease.
authors: Department of Neuroscience, University of Lethbridge, Lethbridge, Alberta, Canada.
authors: Fabiola C R
authors: FC
authors: Zucchi
authors: Youli
authors: Y
authors: Yao
authors: Isaac D
authors: ID
authors: Ward
authors: Yaroslav
authors: Y
authors: Ilnytskyy
authors: David M
authors: DM
authors: Olson
authors: Karen
authors: K
authors: Benzies
authors: Igor
authors: I
authors: Kovalchuk
authors: Olga
authors: O
authors: Kovalchuk
authors: Gerlinde A S
authors: GA
authors: Metz
mesh_terms: D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000378:metabolism; D017931:DNA Primers; D044127:Epigenesis, Genetic; D005260:Female; D001523:Mental Disorders / Q000235:genetics*; D035683:MicroRNAs / Q000235:genetics; D009422:Nervous System Diseases / Q000235:genetics*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000523:psychology*; D020318:Rats, Long-Evans; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013315:Stress, Psychological / Q000150:complications*; D059467:Transcriptome
chemical_list: D017931:DNA Primers; D035683:MicroRNAs