The genomic organisation of the metabotropic glutamate receptor subtype 5 gene, and its association with schizophrenia

Molecular Psychiatry
R S DevonD J Porteous

Abstract

The G-protein coupled metabotropic glutamate receptors (GRMs/mGluRs) have been implicated in the aetiology of schizophrenia as they modulate the NMDA response and that of other neurotransmitters including dopamine and GABA.(1-3) Electrophysiological studies in GRM subtype 5 knockout mice reveal, in one study, a sensorimotor gating deficit characteristic of schizophrenia and in another, a key rôle for this gene in the modulation of hippocampal NMDA-dependent synaptic plasticity. In humans, GRM5 levels are increased in certain pyramidal cell neurons in schizophrenics vs controls.(6) Finally, GRM5 has been mapped to 11q14, neighbouring a translocation that segregates with schizophrenia and related psychoses in a large Scottish family, F23 (MLOD score 6.0). We determined the intron/exon structure of GRM5 and identified a novel intragenic microsatellite. A case-control association study identified a significant difference in allele frequency distribution between schizophrenics and controls (P = 0.04). This is suggestive of involvement of the GRM5 gene in schizophrenia in this population.

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