Dataset Information

Clustering autism: using neuroanatomical differences in 26 mouse models to gain insight into the heterogeneity.

ABSTRACT: Autism is a heritable disorder, with over 250 associated genes identified to date, yet no single gene accounts for >1-2% of cases. The clinical presentation, behavioural symptoms, imaging and histopathology findings are strikingly heterogeneous. A more complete understanding of autism can be obtained by examining multiple genetic or behavioural mouse models of autism using magnetic resonance imaging (MRI)-based neuroanatomical phenotyping. Twenty-six different mouse models were examined and the consistently found abnormal brain regions across models were parieto-temporal lobe, cerebellar cortex, frontal lobe, hypothalamus and striatum. These models separated into three distinct clusters, two of which can be linked to the under and over-connectivity found in autism. These clusters also identified previously unknown connections between Nrxn1?, En2 and Fmr1; Nlgn3, BTBR and Slc6A4; and also between X monosomy and Mecp2. With no single treatment for autism found, clustering autism using neuroanatomy and identifying these strong connections may prove to be a crucial step in predicting treatment response.

SUBMITTER: Ellegood J

PROVIDER: S-EPMC4426202 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature

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Clustering autism: using neuroanatomical differences in 26 mouse models to gain insight into the heterogeneity.

Ellegood J J Anagnostou E E Babineau B A BA Crawley J N JN Lin L L Genestine M M DiCicco-Bloom E E Lai J K Y JK Foster J A JA Peñagarikano O O Geschwind D H DH Pacey L K LK Hampson D R DR Laliberté C L CL Mills A A AA Tam E E Osborne L R LR Kouser M M Espinosa-Becerra F F Xuan Z Z Powell C M CM Raznahan A A Robins D M DM Nakai N N Nakatani J J Takumi T T van Eede M C MC Kerr T M TM Muller C C Blakely R D RD Veenstra-VanderWeele J J Henkelman R M RM Lerch J P JP

Molecular psychiatry 20140909 1

Autism is a heritable disorder, with over 250 associated genes identified to date, yet no single gene accounts for >1-2% of cases. The clinical presentation, behavioural symptoms, imaging and histopathology findings are strikingly heterogeneous. A more complete understanding of autism can be obtained by examining multiple genetic or behavioural mouse models of autism using magnetic resonance imaging (MRI)-based neuroanatomical phenotyping. Twenty-six different mouse models were examined and the ...[more]

PMID: 25199916

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Project description:Autism spectrum disorder (ASD) refers to a large set of neurodevelopmental disorders, which have in common both repetitive behavior and abnormalities in social interactions and communication. Interestingly, most forms of ASD have a strong genetic contribution. However, the molecular underpinnings of this disorder remain elusive. The SHANK3 gene (and to a lesser degree SHANK2) which encode for the postsynaptic density (PSD) proteins SHANK3/SHANK2 and the CONTACTIN 4 gene which encodes for the neuronal glycoprotein CONTACTIN4 (CNTN4) exhibit mutated variants which are associated with ASD. Like many of the other genes associated with ASD, both SHANKs and CNTN4 affect synapse formation and function and are therefore related to the proper development and signaling capability of excitatory and inhibitory neuronal networks in the adult mammal brain. In this study, we used mutant/knock-out mice of Shank2 (Shank2-/-), Shank3 (Shank3??-/-), and Cntn4 (Cntn4-/-) as ASD-models to explore whether these mice share a molecular signature in glutamatergic and GABAergic synaptic transmission in ASD-related brain regions. Using a biotinylation assay and subsequent western blotting we focused our analysis on cell surface expression of several ionotropic glutamate and GABA receptor subunits: GluA1, GluA2, and GluN1 were analyzed for excitatory synaptic transmission, and the ?1 subunit of the GABAA receptor was analyzed for inhibitory synaptic transmission. We found that both Shank2-/- and Shank3??-/- mice exhibit reduced levels of several cell surface glutamate receptors in the analyzed brain regions-especially in the striatum and thalamus-when compared to wildtype controls. Interestingly, even though Cntn4-/- mice also show reduced levels of some cell surface glutamate receptors in the cortex and hippocampus, increased levels of cell surface glutamate receptors were found in the striatum. Moreover, Cntn4-/- mice do not only show brain region-specific alterations in cell surface glutamate receptors but also a downregulation of cell surface GABA receptors in several of the analyzed brain regions. The results of this study suggest that even though mutations in defined genes can be associated with ASD this does not necessarily result in a common molecular phenotype in surface expression of glutamatergic and GABAergic receptor subunits in defined brain regions.

Dataset Information

Clustering autism: using neuroanatomical differences in 26 mouse models to gain insight into the heterogeneity.

Publications

Clustering autism: using neuroanatomical differences in 26 mouse models to gain insight into the heterogeneity.

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