Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Differential DNA Methylation Patterns Define Status Epilepticus and Epileptic Tolerance

ABSTRACT: Comparison of methylation profiles in the CA3 region of the mouse hippocampus in epileptic tolerance and status epilepticus.

ORGANISM(S): Mus musculus

SUBMITTER: suzanne miller-delaney

PROVIDER: E-MEXP-3503 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Differential DNA methylation patterns define status epilepticus and epileptic tolerance.

Miller-Delaney Suzanne F C SF Das Sudipto S Sano Takanori T Jimenez-Mateos Eva M EM Bryan Kenneth K Buckley Patrick G PG Stallings Raymond L RL Henshall David C DC

The Journal of neuroscience : the official journal of the Society for Neuroscience 20120201 5

Prolonged seizures (status epilepticus) produce pathophysiological changes in the hippocampus that are associated with large-scale, wide-ranging changes in gene expression. Epileptic tolerance is an endogenous program of cell protection that can be activated in the brain by previous exposure to a non-harmful seizure episode before status epilepticus. A major transcriptional feature of tolerance is gene downregulation. Here, through methylation analysis of 34,143 discrete loci representing all an ...[more]

PMID: 22302800

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Project description:Here we tested a hypothesis that epileptogenesis influences expression pattern of genes in the basolateral amygdala that are critical for fear conditioning. Whole genome molecular profiling of basolateral rat amygdala was performed to compare the transcriptome changes underlying fear learning in epileptogenic and control animals. Our analysis revealed that after acquisition of fear conditioning 26 genes were regulated differently in the basolateral amygdala of both groups. Thus, our study provides the first evidence that not only the damage to the neuronal pathways but also altered composition or activity level of molecular machinery responsible for formation of emotional memories within surviving pathways can contribute to impairment in emotional learning in epileptogenic animals. Understanding the function of those genes in emotional learning provides an attractive avenue for identification of novel drug targets for treatment of emotional disorders after epileptogenesis-inducing insult. Experiment Overall Design: Experiment description: Experiment Overall Design: Array: Rat Genome 230-2.0 (Affymetrix). Experiment Overall Design: Samples: 2 biological replicates from 4 experimental groups (control unpaired = CU, CU1, control paired = CP, CP1, epileptogenic unpaired = EU, EU1, epileptogenic paired = EP, EP1). Experiment Overall Design: Animals&model: Amygdala stimulation model (Nissinen et al., 2000): Experiment Overall Design: control (C) animals = operated, not stimulated; Experiment Overall Design: epileptogenic (E) animals = stimulated, responded with "good" status epilepticus (at least 40HAFDs within first 3h of SE), not expressing spontaneous seizures through the whole study. Experiment Overall Design: All animals received 5 habituation session to the fear conditioning apparatus lasting 10 min, starting on day 5 (2 sessions on day 5 and 6 and 1 session on day 7) after stimulation (induction of SE). Experiment Overall Design: On 8th day after stimulation: Experiment Overall Design: unpaired (U) = twice received: 2min in apparatus â footshock (1.5mA, 1s)â tone (75dB for 20 sec) Experiment Overall Design: paired (P) = twice received: 2min in apparatus â tone (75dB for 20 sec) co-terminated by footshock (1.5mA, 1s). Experiment Overall Design: RNA isolation: decapitation â ipsilateral temporal lobe isolated, embed in OCT and frozen in -70C. Cut into 10Âµm sections, thionin stained (Ambion protocol), basal and lateral nuclei of the amygdala laser-microdissected; total cellular RNA isolated with PicoPure RNA isolation kit (Arcturus). Experiment Overall Design: RNA amplification: 30ng of of total cellular RNA from each rat underwent of 2 rounds of amplification using MessageAmp II aRNA kit (Ambion), according to manufacturer protocol (in vitro transcription time 14h in both rounds). Experiment Overall Design: Sample pooling: aRNA from 2 animals was pooled (10Âµg in total = 2x5Âµg) and 8 samples were labeled and hybridized: CP, CP1, CU, CU1, EP, EP1, EU, EU1; (altogether aRNA from 16 rats was used).

Dataset Information

Differential DNA Methylation Patterns Define Status Epilepticus and Epileptic Tolerance

Publications

Differential DNA methylation patterns define status epilepticus and epileptic tolerance.

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