Abstract
A genome scan was previously performed and pointed to chromosome 6q21 as a candidate region for autism. This region contains the glutamate receptor 6 (GluR6 or GRIK2) gene, a functional candidate for the syndrome. Glutamate is the principal excitatory neurotransmitter in the brain and is directly involved in cognitive functions such as memory and learning. We used two different approaches, the affected sib-pair (ASP) method and the transmission disequilibrium test (TDT), to investigate the linkage and association between GluR6 and autism. The ASP method, conducted with additional markers on the 51 original families and in eight new sibling pairs, showed a significant excess of allele sharing, generating an elevated multipoint maximum LOD score (ASPEX MLS = 3.28). TDT analysis, performed in the ASP families and in an independent data set of 107 parent-offspring trios, indicated a significant maternal transmission disequilibrium (TDTall P = 0.0004). Furthermore, TDT analysis (with only one affected proband per family) showed significant association between GluR6 and autism (TDT association P = 0.008). In contrast to maternal transmission, paternal transmission of GluR6 alleles was as expected in the absence of linkage, suggesting a maternal effect such as imprinting. Mutation screening was performed in 33 affected individuals, revealing several nucleotide polymorphisms (SNPs), including one amino acid change (M867I) in a highly conserved domain of the intracytoplasmic C-terminal region of the protein. This change is found in 8% of the autistic subjects and in 4% of the control population and seems to be more maternally transmitted than expected to autistic males (P = 0.007). Taken together, these data suggest that GluR6 is in linkage disequilibrium with autism.
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Acknowledgements
We thank the patients and their families who made this research possible, Dr Ken McElreavey and Dr Christophe Mulle for helpful discussions and comments during the writing of the manuscript, and Johann Tassin for technical assistance. Genotyping facilities were provided by the Centre National de Genotypage (CNG), Evry, France. This work was supported by the Délégation de la Recherche Clinique de l'Assistance Publique-Hôpitaux de Paris, the French Research Ministry (Actions Concertées Incitatives), France Télécom, and the Swedish Medical Research Council. CB was supported by a Cure Autism Now Foundation Award.
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Jamain, S., Betancur, C., Quach, H. et al. Linkage and association of the glutamate receptor 6 gene with autism. Mol Psychiatry 7, 302–310 (2002). https://doi.org/10.1038/sj.mp.4000979
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