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Is schizophrenia a dopamine supersensitivity psychotic reaction? Seeman MV et al. Prog Neuropsychopharmacol Biol Psychiatry. (2014)

Rethinking schizophrenia. Insel TR et al. Nature. (2010)

New perspectives on schizophrenia in later life: implications for treatment, policy, and research. Cohen CI et al. Lancet Psychiatry. (2015)

Int J Neuropsychopharmacol. 2012 May;15(4):459-69. doi: 10.1017/S1461145711000903. Epub 2011 Jun 20.

DOCK4 and CEACAM21 as novel schizophrenia candidate genes in the Jewish population.

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Biological Psychiatry Laboratory, Department of Psychiatry, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.

Erratum in

  • Int J Neuropsychopharmacol. 2012 May;15(4):541.


It is well accepted that schizophrenia has a strong genetic component. Several genome-wide association studies (GWASs) of schizophrenia have been published in recent years; most of them population based with a case-control design. Nevertheless, identifying the specific genetic variants which contribute to susceptibility to the disorder remains a challenging task. A family-based GWAS strategy may be helpful in the identification of schizophrenia susceptibility genes since it is protected against population stratification, enables better accounting for genotyping errors and is more sensitive for identification of rare variants which have a very low frequency in the general population. In this project we implemented a family-based GWAS of schizophrenia in a sample of 107 Jewish-Israeli families. We found one genome-wide significant association in the intron of the DOCK4 gene (rs2074127, p value=1.134×10⁻⁷) and six additional nominally significant association signals with p<1×10⁻⁵. One of the top single nucleotide polymorphisms (p<1×10⁻⁵) which is located in the predicted intron of the CEACAM21 gene was significantly replicated in independent family-based sample of Arab-Israeli origin (rs4803480: p value=0.002; combined p value=9.61×10⁻⁸), surviving correction for multiple testing. Both DOCK4 and CEACAM21 are biologically reasonable candidate genes for schizophrenia although generalizability of the association of DOCK4 with schizophrenia should be investigated in further studies. In addition, gene-wide significant associations were found within three schizophrenia candidate genes: PGBD1, RELN and PRODH, replicating previously reported associations. By application of a family-based strategy to GWAS, our study revealed new schizophrenia susceptibility loci in the Jewish-Israeli population.

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