Abstract
We attempt to identify gene by childhood abuse interactions which predispose to the development of schizotypal traits in a familial bipolar disorder (BD) sample. Self-report measures of schizotypal personality traits (Schizotypal Personality Scale) and childhood maltreatment (Childhood Trauma Questionnaire) were administered to 222 participants from 44 families with BD. Variants of catechol-o-methyltransferase (COMT) and four other dopamine pathway-related genes: DRD4, DRD2,MAOA, and SLC6A3, were typed. BD type I (BD I) subjects scored significantly higher than their unaffected relatives on the Schizotypal Personality Scale. The val allele of the Val158 Met polymorphism of the COMT gene was associated with increased schizotypal personality trait scores in individuals exposed to higher levels of self-reported childhood trauma (p < 0.05). There was no direct effect of the val158met polymorphism on schizotypal personality traits. Further, no passive correlation between COMT genotype and childhood trauma was found. We raise the possibility that genetically-driven variation in COMT may interact with childhood trauma to contribute to the risk of developing schizotypal personality traits.
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Acknowledgments
The authors would like to thank Elize Pietersen and Gameda Benefeld for conducting psychological interviews. The support of the University of Cape Town’s Brain-Behaviour Initiative and the Medical Research Council of South Africa is acknowledged.
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Appendix
Appendix
Mood state of sample
Table 8 lists the mood state of the sample at the time of testing as measured with the Beck Depression Inventory and Altman Self-Rating Mania Scale.
Genotyping
Table 9 lists the polymorphisms typed in the study.
Variable Number Tandem Repeats (VNTR) and insertion/deletion polymorphisms were scored on the Applied Biosystems (ABI) 3100 sequencer using GeneMapper software, while the DRD2 Taq1A single nucleotide polymorphism (SNP) was genotyped using restriction digests and scored on a polyacrylamide gel. Primer sequences were obtained from the literature or designed online.
In cases where the variant had more than two alleles, we converted them to two pseudo-alleles. For SLC6A3 (DAT), we compared the 9R allele to all the others (only two individuals in the sample did not carry a 9R or a 10R allele). For DRD4 we coded 2R, 3R, and 4R variants as short, and 7R and 8R variants as long. There are data to suggest differences in function between short and long alleles and this analytical approach has been followed by other researchers (Savitz and Ramesar 2004). Because MAO-A is X-linked, we coded males as homozygous (instead of hemizygous) for the particular allele that they carry (see Tables 10, 11).
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Savitz, J., van der Merwe, L., Newman, T.K. et al. Catechol-o-Methyltransferase Genotype and Childhood Trauma May Interact to Impact Schizotypal Personality Traits. Behav Genet 40, 415–423 (2010). https://doi.org/10.1007/s10519-009-9323-7
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DOI: https://doi.org/10.1007/s10519-009-9323-7