title: Pre- and Post-Natal Stress Programming: Developmental Exposure to Glucocorticoids Causes Long-Term Brain-Region Specific Changes to Transcriptome in the Precocial Japanese Quail.
abstract: Exposure to stress during early development can permanently influence an individual's physiology and behaviour, and affect its subsequent health. The extent to which elevated glucocorticoids cause such long-term 'programming' remains largely untested. In the present study, using the Japanese quail as our study species, we independently manipulated exposure to corticosterone during pre- and/or post-natal development and investigated the subsequent effects on global gene expression profiles within the hippocampus and hypothalamus upon achieving adulthood. Our results showed that the changes in transcriptome profiles in response to corticosterone exposure clearly differed between the hippocampus and the hypothalamus. We also showed that these effects depended on the developmental timing of exposure and identified brain-region specific gene expression patterns that were either: (i) similarly altered by corticosterone regardless of the developmental stage in which hormonal exposure occurred or (ii) specifically and uniquely altered by either pre-natal or post-natal exposure to corticosterone. Corticosterone-treated birds showed alterations in networks of genes that included known markers of the programming actions of early-life adversity (e.g. brain-derived neurotrophic factor and mineralocorticoid receptor within the hippocampus; corticotrophin-releasing hormone and serotonin receptors in the hypothalamus). Altogether, for the first time, these findings provide experimental support for the hypothesis that exposure to elevated glucocorticoids during development may be a key hormonal signalling pathway through which the long-term phenotypic effects associated with early-life adversity emerge and potentially persist throughout the lifespan. These data also highlight that stressors might have different long-lasting impacts on the brain transcriptome depending on the developmental stage in which they are experienced; more work is now required to relate these mechanisms to organismal phenotypic differences.
authors.affiliation: Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK.
authors.forename: V
authors.identifier: 0000-0002-2981-7909
authors.initials: V
authors.lastname: Marasco
authors.affiliation: Institute of Molecular Cell and Systems Biology, University of Glasgow, Glasgow, UK.|Glasgow Polyomics, Wolfson Wohl Cancer Research Centre, University of Glasgow, Glasgow, UK.
authors.forename: P
authors.initials: P
authors.lastname: Herzyk
authors.affiliation: Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, UK.
authors.forename: J
authors.initials: J
authors.lastname: Robinson
authors.affiliation: School of Psychology and Neuroscience, University of St Andrews, St Andrews, UK.
authors.forename: K A
authors.initials: KA
authors.lastname: Spencer
mesh_terms: D000818:Animals; D030161:Avian Proteins / Q000235:genetics; D003345:Corticosterone / Q000008:administration & dosage*; D003370:Coturnix; D005260:Female; D005938:Glucocorticoids / Q000008:administration & dosage*; D006624:Hippocampus / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D007031:Hypothalamus / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D008297:Male; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects / Q000235:genetics* / Q000378:metabolism; D013312:Stress, Physiological; D059467:Transcriptome
chemical_list: D030161:Avian Proteins; D005938:Glucocorticoids; D003345:Corticosterone
keywords: brain transcriptome; early-life stress; hippocampus; hypothalamus; pre- and post-natal glucocorticoid exposure