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Journal Articles PLoS Genetics Year : 2012

Genetic and functional analyses of SHANK2 mutations suggest a multiple hit model of autism spectrum disorders.

1 Génétique Humaine et Fonctions Cognitives
2 Universität Ulm - Ulm University [Ulm, Allemagne]
3 Service de psychopathologie de l'enfant et de l'adolescent
4 Physiopathologie des Maladies du Système Nerveux Central
5 Department of Child and Adolescent Psychiatry
6 Forensic Psychiatry
7 Department of Child and Adolescent Psychiatry
8 Department of Pharmacology
9 Génotypage des Eucaryotes (Plate-Forme)
10 Behavioural and Brain Sciences Unit, Institute of Child Health
11 UMCU - University Medical Center [Utrecht]
12 The Wellcome Trust Centre for Human Genetics [Oxford]
13 Department of Medical and Clinical Genetics [Helsinki]
14 Academic Department of Child and Adolescent Psychiatry, Institute of Psychiatry
15 SGDP - Social, Genetic and Developmental Psychiatry Centre
16 Department of Child and Adolescent Psychiatry
17 Division of Molecular Genome Analysis
18 Division of Molecular Genome Analysis
19 Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy
20 Department of Pharmacy and Biotechnology
21 Institute of Biotechnology
22 Department of Psychiatry and Behavioral Sciences [Stanford]
23 Division of Child Neurology and Psychiatry, Department of Paediatrics
24 INSA - Instituto Nacional de Saùde Dr Ricardo Jorge [Portugal]
25 BioFIG
26 UNDA - Unidade de Neurodesenvolvimento e Autismo
27 Human Genetics Center
28 The Centre for Applied Genomics, Toronto
29 Program in Genetics and Genomic Biology
30 CNG - Centre National de Génotypage
31 CHU Angers - Centre Hospitalier Universitaire d'Angers
32 BNVI - Biologie Neurovasculaire Intégrée
33 Unité Pédopsychiatrique et Neuropédiatrique de Diagnostic et d'Evaluation des Troubles Envahissants du Développement
34 Département de génétique et procréation
35 IMRB - Institut Mondor de Recherche Biomédicale
36 Institute for Anatomy and Cell Biology
Elodie Ey
Roberto Toro
Marc Délépine
  • Function : Author
  • PersonId : 919144
Marion Leboyer

Abstract

Autism spectrum disorders (ASD) are a heterogeneous group of neurodevelopmental disorders with a complex inheritance pattern. While many rare variants in synaptic proteins have been identified in patients with ASD, little is known about their effects at the synapse and their interactions with other genetic variations. Here, following the discovery of two de novo SHANK2 deletions by the Autism Genome Project, we identified a novel 421 kb de novo SHANK2 deletion in a patient with autism. We then sequenced SHANK2 in 455 patients with ASD and 431 controls and integrated these results with those reported by Berkel et al. 2010 (n = 396 patients and n = 659 controls). We observed a significant enrichment of variants affecting conserved amino acids in 29 of 851 (3.4%) patients and in 16 of 1,090 (1.5%) controls (P = 0.004, OR = 2.37, 95% CI = 1.23-4.70). In neuronal cell cultures, the variants identified in patients were associated with a reduced synaptic density at dendrites compared to the variants only detected in controls (P = 0.0013). Interestingly, the three patients with de novo SHANK2 deletions also carried inherited CNVs at 15q11-q13 previously associated with neuropsychiatric disorders. In two cases, the nicotinic receptor CHRNA7 was duplicated and in one case the synaptic translation repressor CYFIP1 was deleted. These results strengthen the role of synaptic gene dysfunction in ASD but also highlight the presence of putative modifier genes, which is in keeping with the "multiple hit model" for ASD. A better knowledge of these genetic interactions will be necessary to understand the complex inheritance pattern of ASD.

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Genetics
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Dates and versions

inserm-00834560 , version 1 (16-06-2013)

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Claire S. Leblond, Jutta Heinrich, Richard Delorme, Christian Proepper, Catalina Betancur, et al.. Genetic and functional analyses of SHANK2 mutations suggest a multiple hit model of autism spectrum disorders.. PLoS Genetics, 2012, 8 (2), pp.e1002521. ⟨10.1371/journal.pgen.1002521⟩. ⟨inserm-00834560⟩
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