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TitleMotor and cognitive deficits in the heterozygous leaner mouse, a Cav2.1 voltage-gated Ca2+ channel mutant
Author(s)Alonso, Isabel
Marques, Joana M.
Sousa, Nuno
Sequeiros, Jorge
Olsson, I. Anna S.
Silveira, Isabel
Calcium Channels, N-Type
Cognition Disorders
Mice, Inbred C57BL
Movement Disorders
rotarod test
water maze test
natural mutant
calcium currents
Issue dateNov-2008
JournalNeurobiology of Aging
Abstract(s)The leaner mutation in mice affects the Ca(v)2.1 voltage-gated calcium channel alpha(1A)-subunit gene (Cacna1a), causing a reduction in calcium currents predominantly in Purkinje cells. This reduction in calcium currents causes severe progressive cerebellar ataxia, beginning around postnatal day 10, in homozygous leaner mice (tg(la)/tg(la)), while their heterozygous littermates (tg(la)/+) present no obvious behavioral deficits. In humans, heterozygous mutations in the Cacna1a orthologous gene produce a broad range of neurological manifestations. To evaluate the phenotypic status of the tg(la)/+ animals, we assessed motor performance and cognition, at different ages, in these mutant mice. We were able to observe age-dependent impairment in motor and cognitive tasks; balance and motor learning deficits were found in demanding tasks on the rotarod and on the hanging wire test, while spatial learning and memory impairment was observed in the Morris water maze. Progressive dysfunction in escape reflexes, indicative of neurological impairment, was also present in tg(la)/+ animals. Although not presenting major motor alterations, tg(la)/+ mice show age-dependent motor and cognitive deficits.
DescriptionSupplementary data associated with this article can be found, in the online version, at doi:10.1016/j.neurobiolaging.
AccessOpen access
Appears in Collections:ICVS - Artigos em Revistas Internacionais com Referee

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