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Schizophrenia is a complex disorder with a multifactorial polygenic inheritance with several genes conferring susceptibility at many genetic locations, each with a small effect. An attractive candidate gene for schizophrenia is the catechol‐O‐methyltransferase (COMT) gene, which is a modulator of dorsolateral prefrontal cortical function. A missense G to A mutation in this gene that results in a substitution of Methionine (Met) for Valine (Val) at codon 108/158 (Val108/158 Met) has recently been identified in association to schizophrenia. We compared allele frequencies of the variant Val allele between 96 schizophrenia cases and 80 normal controls. We selected controls from a similar pool to cases in ethnicity and gender. The frequency of the Val allele was significantly higher in schizophrenia cases compared to controls (0.620 vs. 0.506; P = 0.043). Calculation of the population attributable risk suggests that the Val allele accounts for as much as 23% of schizophrenia in this population (range: 3–38%). These results provide support for a role of this variant in the etiopathophysiology of schizophrenia. © 2003 Wiley‐Liss, Inc.
American Journal of Medical Genetics – Wiley
Published: Jul 1, 2003
Keywords: schizophrenia; candidate gene; association; COMT gene; polymorphism
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