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- Title
Mapping a mouse limbic seizure susceptibility locus on chromosome 10.
- Authors
Winawer, Melodie R.; Gildersleeve, Sandra S.; Phillips, Austin G.; Rabinowitz, Daniel; Palmer, Abraham A.
- Abstract
Purpose: Mapping seizure susceptibility loci in mice provides a framework for identifying potentially novel candidate genes for human epilepsy. Using C57BL/6J × A/J chromosome substitution strains (CSS), we previously identified a locus on mouse chromosome 10 (Ch10) conferring susceptibility to pilocarpine, a muscarinic cholinergic agonist that models human temporal lobe epilepsy by inducing initial limbic seizures and status epilepticus (status), followed by hippocampal cell loss and delayed-onset chronic spontaneous limbic seizures. Herein we report further genetic mapping of pilocarpine quantitative trait loci (QTLs) on Ch10. Methods: Seventy-nine Ch10 F2 mice were used to map QTLs for duration of partial status epilepticus and the highest stage reached in response to pilocarpine. Based on those results we created interval-specific congenic lines to confirm and extend the results, using sequential rounds of breeding selectively by genotype to isolate segments of A/J Ch10 genome on a B6 background. Key Findings: Analysis of Ch10 F2 genotypes and seizure susceptibility phenotypes identified significant, overlapping QTLs for duration of partial status and severity of pilocarpine-induced seizures on distal Ch10. Interval-specific Ch10 congenics containing the susceptibility locus on distal Ch10 also demonstrated susceptibility to pilocarpine-induced seizures, confirming results from the F2 mapping population and strongly supporting the presence of a QTL between rs13480781 (117.6 Mb) and rs13480832 (127.7 Mb). Significance: QTL mapping can identify loci that make a quantitative contribution to a trait, and eventually identify the causative DNA-sequence polymorphisms. We have mapped a locus on mouse Ch10 for pilocarpine-induced limbic seizures. Novel candidate genes identified in mice can be investigated in functional studies and tested for their role in human epilepsy.
- Subjects
LABORATORY mice; SEIZURES (Medicine); DISEASE susceptibility; LOCUS (Genetics); CHROMOSOMES; CHROMOSOME substitution; PILOCARPINE; MUSCARINIC agonists
- Publication
Epilepsia (Series 4), 2011, Vol 52, Issue 11, p2076
- ISSN
0013-9580
- Publication type
Article
- DOI
10.1111/j.1528-1167.2011.03256.x