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Kieran C. Murphy, MB, MRCPsych; Lisa A. Jones, PhD; Michael J. Owen, MB, PhD, FRCPsych

Arch Gen Psychiatry. 1999;56:940-945.

Background  Velo-cardio-facial syndrome (VCFS), a syndrome characterized by an increased frequency of schizophrenia and bipolar disorder, is associated with small interstitial deletions of chromosome 22q11.

Methods  We evaluated 50 adults with VCFS using a structured clinical interview (Schedules for Clinical Assessment in Neuropsychiatry or Psychiatric Assessment Schedule for Adults With Developmental Disability if IQ <50) to establish a DSM-IV diagnosis. The schizophrenia phenotype in individuals with VCFS and schizophrenia was compared with a matched series of individuals with schizophrenia and without VCFS (n=12). The King's Schizotypy Questionnaire was administered to individuals with VCFS (n=41), their first-degree relatives (n=68), and a series of unrelated normal controls (n=316). All individuals with VCFS deleted for the N25 probe (n=48) were genotyped for a genetic polymorphism in the COMT gene that results in variations in enzymatic activity.

Results  Fifteen individuals with VCFS (30%) had a psychotic disorder, with 24% (n=12) fulfilling DSM-IV criteria for schizophrenia. In addition, 6 (12%) had major depression without psychotic features. The individuals with schizophrenia had fewer negative symptoms and a relatively later age of onset compared with those with schizophrenia and without VCFS. We found no evidence that possession of the low-activity COMT allele was associated with schizophrenia in our sample of individuals with VCFS.

Conclusions  The high prevalence of schizophrenia in this group suggests that chromosome 22q11 might harbor a gene or genes relevant to the etiology of schizophrenia in the wider population.

From the Divisions of Psychological Medicine and Medical Genetics, University of Wales College of Medicine, Cardiff.

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