Unknown,Transcriptomics,Genomics,Proteomics

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Transitions in infant learning are modulated by dopamine within the amygdala

ABSTRACT: Behavioral transitions Young infant rats paradoxically prefer odors paired with shock but older pups learn aversions. This transition is amygdala- and corticosterone-dependent. Microarray results showed downregulated dopaminergic presynaptic function in the amygdala with preference learning. Corticosterone injected 8-day-old pups and untreated 12-day-old pups learn aversions and had dopaminergic upregulation in the amygdala. 8 day saline or corticosterone treated- or 12 day old untreated rat pups were trained with odor-shock pairings. Immediately after training pups were sacrificed and the amygdala dissected out. Controls were unpaired shock-odor groups.Paired and unpaired groups were processed together for each experimental condition. Paired and unpaired data were compared by ranked products.

ORGANISM(S): Rattus norvegicus

SUBMITTER: Gordon Barr

PROVIDER: E-GEOD-17651 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Transitions in infant learning are modulated by dopamine in the amygdala.

Barr Gordon A GA Moriceau Stephanie S Shionoya Kiseko K Muzny Kyle K Gao Puhong P Wang Shaoning S Sullivan Regina M RM

Nature neuroscience 20090927 11

Behavioral transitions characterize development. Young infant rats paradoxically prefer odors that are paired with shock, but older pups learn aversions. This transition is amygdala and corticosterone dependent. Using microarrays and microdialysis, we found downregulated dopaminergic presynaptic function in the amygdala with preference learning. Corticosterone-injected 8-d-old pups and untreated 12-d-old pups learned aversions and had dopaminergic upregulation in the amygdala. Dopamine injection ...[more]

PMID: 19783994

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Project description:There is increasing appreciation for sexually dimorphic effects, but the molecular mechanisms underlying these effects are only partially understood. In the present study, we explored transcriptomics and epigenetic differences in the small intestine and colon of prepubescent male and female mice. In addition, the microbiota composition of the colonic luminal content has been examined. At postnatal day 14, male and female C57BL/6 mice were sacrificed and the small intestine, colon and content of luminal colon were isolated. Gene expression of both segments of the intestine was analysed by microarray analysis. DNA methylation of the promoter regions of selected sexually dimorphic genes was examined by pyrosequencing. Composition of the microbiota was explored by deep sequencing. Sexually dimorphic genes were observed in both segments of the intestine of 2-week-old mouse pups, with a stronger effect in the small intestine. Amongst the total of 349 genes displaying a sexually dimorphic effect in the small intestine and/or colon, several candidates exhibited a previously established function in the intestine (i.e. Nts, Nucb2, Alox5ap and Retnlγ). In addition, differential expression of genes linked to intestinal bowel disease (i.e. Ccr3, Ccl11 and Tnfr) and colorectal cancer development (i.e. Wt1 and Mmp25) was observed between males and females. Amongst the genes displaying significant sexually dimorphic expression, nine genes were histone-modifying enzymes, suggesting that epigenetic mechanisms might be a potential underlying regulatory mechanism. However, our results reveal no significant changes in DNA methylation of analysed CpGs within the selected differentially expressed genes. With respect to the bacterial community composition in the colon, a dominant effect of litter origin was found but no significant sex effect was detected. However, a sex effect on the dominance of specific taxa was observed. This study reveals molecular dissimilarities between males and females in the small intestine and colon of prepubescent mice, which might underlie differences in physiological functioning and in disease predisposition in the two sexes. Small intestine and colon were isolated from two-week old pups of dams fed a low-fat diet and subjected to gene expression profiling

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Transitions in infant learning are modulated by dopamine within the amygdala

Publications

Transitions in infant learning are modulated by dopamine in the amygdala.

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