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Your search keyword '"Lepagnol-Bestel AM"' showing total 2 results
Start Over Author "Lepagnol-Bestel AM" Topic alzheimer disease
2 results on '"Lepagnol-Bestel AM"'

1. Chr21 protein-protein interactions: enrichment in proteins involved in intellectual disability, autism, and late-onset Alzheimer's disease.

Author

Viard J, Loe-Mie Y, Daudin R, Khelfaoui M, Plancon C, Boland A, Tejedor F, Huganir RL, Kim E, Kinoshita M, Liu G, Haucke V, Moncion T, Yu E, Hindie V, Bléhaut H, Mircher C, Herault Y, Deleuze JF, Rain JC, Simonneau M, and Lepagnol-Bestel AM

Subjects
Animals, Drosophila, Humans, Mice, Alzheimer Disease genetics, Autism Spectrum Disorder genetics, Autistic Disorder genetics, Down Syndrome genetics, Down Syndrome metabolism, Intellectual Disability genetics
Abstract

Down syndrome (DS) is caused by human chromosome 21 (HSA21) trisomy. It is characterized by a poorly understood intellectual disability (ID). We studied two mouse models of DS, one with an extra copy of the <i>Dyrk1A</i> gene (189N3) and the other with an extra copy of the mouse Chr16 syntenic region (Dp(16)1Yey). RNA-seq analysis of the transcripts deregulated in the embryonic hippocampus revealed an enrichment in genes associated with chromatin for the 189N3 model, and synapses for the Dp(16)1Yey model. A large-scale yeast two-hybrid screen (82 different screens, including 72 HSA21 baits and 10 rebounds) of a human brain library containing at least 10<sup>7</sup> independent fragments identified 1,949 novel protein-protein interactions. The direct interactors of HSA21 baits and rebounds were significantly enriched in ID-related genes (<i>P</i>-value < 2.29 × 10<sup>-8</sup>). Proximity ligation assays showed that some of the proteins encoded by HSA21 were located at the dendritic spine postsynaptic density, in a protein network at the dendritic spine postsynapse. We located HSA21 DYRK1A and DSCAM, mutations of which increase the risk of autism spectrum disorder (ASD) 20-fold, in this postsynaptic network. We found that an intracellular domain of DSCAM bound either DLGs, which are multimeric scaffolds comprising receptors, ion channels and associated signaling proteins, or DYRK1A. The DYRK1A-DSCAM interaction domain is conserved in <i>Drosophila</i> and humans. The postsynaptic network was found to be enriched in proteins associated with ARC-related synaptic plasticity, ASD, and late-onset Alzheimer's disease. These results highlight links between DS and brain diseases with a complex genetic basis., (© 2022 Viard et al.)

Published
2022
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2. Fluorescent nanodiamond tracking reveals intraneuronal transport abnormalities induced by brain-disease-related genetic risk factors.

Author

Haziza S, Mohan N, Loe-Mie Y, Lepagnol-Bestel AM, Massou S, Adam MP, Le XL, Viard J, Plancon C, Daudin R, Koebel P, Dorard E, Rose C, Hsieh FJ, Wu CC, Potier B, Herault Y, Sala C, Corvin A, Allinquant B, Chang HC, Treussart F, and Simonneau M

Subjects
Animals, Biological Transport, Active genetics, Cells, Cultured, Mice, Mice, Transgenic, Microscopy, Fluorescence methods, Microscopy, Video methods, Alzheimer Disease genetics, Alzheimer Disease metabolism, Alzheimer Disease pathology, Autistic Disorder genetics, Autistic Disorder metabolism, Autistic Disorder pathology, Cell Tracking methods, Hippocampus metabolism, Hippocampus pathology, Nanodiamonds chemistry, Neurons metabolism, Neurons pathology
Abstract

Brain diseases such as autism and Alzheimer's disease (each inflicting >1% of the world population) involve a large network of genes displaying subtle changes in their expression. Abnormalities in intraneuronal transport have been linked to genetic risk factors found in patients, suggesting the relevance of measuring this key biological process. However, current techniques are not sensitive enough to detect minor abnormalities. Here we report a sensitive method to measure the changes in intraneuronal transport induced by brain-disease-related genetic risk factors using fluorescent nanodiamonds (FNDs). We show that the high brightness, photostability and absence of cytotoxicity allow FNDs to be tracked inside the branches of dissociated neurons with a spatial resolution of 12 nm and a temporal resolution of 50 ms. As proof of principle, we applied the FND tracking assay on two transgenic mouse lines that mimic the slight changes in protein concentration (∼30%) found in the brains of patients. In both cases, we show that the FND assay is sufficiently sensitive to detect these changes.

Published
2017
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