APP heterozygosity averts memory deficit in knockin mice expressing the Danish dementia BRI2 mutant
| Autor: | Shuji Matsuda, Luciano D'Adamio, Robert Tamayev, Ottavio Arancio, Luca Giliberto |
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| Rok vydání: | 2011 |
| Předmět: |
Genetics
Mutation General Immunology and Microbiology General Neuroscience Mutant Biology medicine.disease medicine.disease_cause General Biochemistry Genetics and Molecular Biology Loss of heterozygosity mental disorders Synaptic plasticity medicine Dementia Allele Alzheimer's disease Molecular Biology Gene |
| Zdroj: | The EMBO Journal. 30:2501-2509 |
| ISSN: | 0261-4189 |
| DOI: | 10.1038/emboj.2011.161 |
| Popis: | An autosomal dominant mutation in the BRI2/ITM2B gene causes familial Danish dementia (FDD). Analysis of FDDKI mice, a mouse model of FDD genetically congruous to the human disease since they carry one mutant and one wild-type Bri2/Itm2b allele, has shown that the Danish mutation causes loss of Bri2 protein, synaptic plasticity and memory impairments. BRI2 is a physiological interactor of Aβ-precursor protein (APP), a gene associated with Alzheimer disease, which inhibits processing of APP. Here, we show that APP/Bri2 complexes are reduced in synaptic membranes of FDDKI mice. Consequently, APP metabolites derived from processing of APP by β-, α- and γ-secretases are increased in Danish dementia mice. APP haplodeficiency prevents memory and synaptic dysfunctions, consistent with a role for APP metabolites in the pathogenesis of memory and synaptic deficits. This genetic suppression provides compelling evidence that APP and BRI2 functionally interact, and that the neurological effects of the Danish form of BRI2 only occur when sufficient levels of APP are supplied by two alleles. This evidence establishes a pathogenic sameness between familial Danish and Alzheimer's dementias. |
| Databáze: | OpenAIRE |
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