Analysis of 14 CAG repeat-containing genes in schizophrenia

Ridha Joober*, Chawki Benkelfat, André Toulouse, Ronald G A Lafrenière, Samarthji Lal, Senda Ajroud, Gustavo Turecki, David Bloom, Alain Labelle, Pierre Lalonde, Martin Alda, Kenneth Morgan, Roberta Palmour, Guy A. Rouleau

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


Recently, it has been suggested that trinucleotide repeat-containing genes may be involved in the etiology of schizophrenia. This study was aimed at investigating putative associations between allelic variants or expansions of CAG repeat-containing genes (CAGrCG) and schizophrenia or its variability with respect to responsiveness to conventional neuroleptics. CAG repeat allelic variants of 14 expressed sequences were compared among three groups of subjects: neuroleptic-responder (R; n = 43) and neuroleptic-nonresponder (NR; n = 63) schizophrenic patients, and a control group (C; n = 122). No CAG expansions, in the range of those observed in neurodegenerative diseases, were identified in these 14 expressed sequences. The sizes of CAG repeat for the hGT1 gene were marginally different among the three groups of subjects (Kruskal-Wallis (2, 456) = 10.48, Bonferroni corrected P = 0.047). Comparisons among the different groups indicated that neuroleptic responders have shorter alleles compared to controls (Mann-Whitney adjusted Z = -3.23, P = 0.0012). NR patients were not different from controls. These preliminary results suggest that the hGT1 gene, or a gene in its vicinity, may be involved in the etiology of schizophrenia or in modifying the disease phenotype with regard to outcome and/or neuroleptic responsiveness.

Original languageEnglish (US)
Pages (from-to)694-699
Number of pages6
JournalAmerican Journal of Medical Genetics - Neuropsychiatric Genetics
Issue number6
StatePublished - Dec 15 1999


  • Anticipation
  • CAG repeats
  • Schizophrenia
  • hGT1 gene

ASJC Scopus subject areas

  • Genetics(clinical)
  • Psychiatry and Mental health
  • Cellular and Molecular Neuroscience


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