RGD Reference Report - Characterization of seizures in the flathead rat: a new genetic model of epilepsy in early postnatal development. - Rat Genome Database

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Characterization of seizures in the flathead rat: a new genetic model of epilepsy in early postnatal development.

Authors: Sarkisian, M R  Rattan, S  D'Mello, S R  LoTurco, J J 
Citation: Sarkisian MR, etal., Epilepsia. 1999 Apr;40(4):394-400.
RGD ID: 13204836
Pubmed: PMID:10219263   (View Abstract at PubMed)


PURPOSE: Disorders in normal central nervous system (CNS) development are often associated with epilepsy. This report characterizes seizures in a novel genetic model of developmental epilepsy, the Flathead (FH) rat.
METHODS: Animals (n = 76) ages P0-22 were monitored for clinical and electrographic seizure activity. The effects of various AEDs on seizure frequency and duration also were assessed: phenobarbital (PB; 40 mg/kg), valproate (VPA; 400 mg/kg), or ethosuximide (ESM; 600 mg/kg).
RESULTS: FHs display episodes of behavior characterized by whole-body tremor, strub tail, alternating forelimb clonus, and complete tonus. EEG recordings from neocortex reveal that FH seizures are bilateral and begin around P7. Seizures occur at a frequency of approximately six per hour from P7 to P18 and the average duration of seizures increases through development. PB, VPA, and ESM failed to prevent seizures; however, PB significantly increased the interval of seizures but had no effects on the duration of seizures, whereas VPA decreased the duration of seizures and not the interval.
CONCLUSIONS: Seizures in FH rats occur at a constant and high frequency through a defined period in early postnatal development, and these seizures are not completely blocked by high doses of PB, VPA, or ESM. Because FH is a single-locus mutant displaying a highly regular pattern of seizure activity, it is an ideal model for examining the process of epileptogenesis in the developing brain, evaluating new AED therapies, and determining the identity of a gene essential to the normal development of cortical excitability.



Disease Annotations    
epilepsy  (IAGP,ISO)
microcephaly  (IAGP,ISO)
visual epilepsy  (IAGP,ISO)

Phenotype Annotations    

Mammalian Phenotype
flat head  (IAGP)
Objects Annotated

Genes (Rattus norvegicus)
Cit  (citron rho-interacting serine/threonine kinase)
CitfhJjlo  (citron rho-interacting serine/threonine kinase; flat head mutant, Jjlo)

Genes (Mus musculus)
Cit  (citron)

Genes (Homo sapiens)
CIT  (citron rho-interacting serine/threonine kinase)

Strains
WI-CitfhJjlo/Rrrc  (flathead rat)


Additional Information