Mapping a mouse limbic seizure susceptibility locus on chromosome 10
Melodie R Winawer1, Sandra S Gildersleeve, Austin G Phillips
1Department of Neurology, Columbia University, New York, New York 10032, USA. mw211@columbia.edu
Researchers mapped a seizure susceptibility locus on mouse chromosome 10 for pilocarpine-induced seizures. This work aids in identifying novel genes for human epilepsy by pinpointing a specific chromosomal region.
Area of Science:
- Genetics
- Neuroscience
- Epilepsy Research
Background:
- Mapping seizure susceptibility loci in mice offers a strategy for discovering new candidate genes for human epilepsy.
- Previous studies identified a susceptibility locus on mouse chromosome 10 (Ch10) for pilocarpine-induced seizures using chromosome substitution strains (CSS).
- Pilocarpine models human temporal lobe epilepsy, inducing seizures, status epilepticus, and subsequent chronic seizures.
Purpose of the Study:
- To perform further genetic mapping of quantitative trait loci (QTLs) associated with pilocarpine-induced seizures on mouse chromosome 10.
- To refine the location of a genetic locus contributing to seizure susceptibility.
- To identify potential candidate genes for epilepsy.
Main Methods:
- Utilized 79 F2 mice derived from C57BL/6J × A/J chromosome substitution strains for quantitative trait loci (QTL) mapping.
- Mapped QTLs for the duration of partial status epilepticus and the highest seizure stage induced by pilocarpine.
- Developed interval-specific congenic lines through selective breeding to confirm and isolate the identified susceptibility locus on a B6 background.
Main Results:
- Analysis revealed significant, overlapping QTLs for seizure duration and severity on distal chromosome 10 in the F2 mapping population.
- Interval-specific congenic lines carrying the distal Ch10 susceptibility locus confirmed increased susceptibility to pilocarpine-induced seizures.
- The QTL for pilocarpine-induced seizures was localized to a region between rs13480781 (117.6 Mb) and rs13480781 (127.7 Mb) on mouse chromosome 10.
Conclusions:
- Quantitative trait loci (QTL) mapping successfully identified a locus on mouse chromosome 10 contributing to pilocarpine-induced limbic seizures.
- This study refines the genetic location of a key susceptibility locus for epilepsy-like seizures in mice.
- The identified locus and associated candidate genes warrant further investigation for their role in human epilepsy.
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