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Association between dopamine beta hydroxylase gene polymorphism and age at onset in male schizophrenia

Published online by Cambridge University Press:  24 June 2014

İ.Ö. Barlas ,
Umit Semiz ,
M.E. Erdal ,
Ayhan Algül ,
Ozlem I. Ay ,
M.A. Ateş ,
Handan Camdeviren ,
Cengiz Basoglu  and
Hasan Herken
İ.Ö. Barlas*
Affiliation:
Department of Medical Biology and Genetics, Medical Faculty of Mersin University, Mersin, Turkey
Umit Semiz
Affiliation:
Department of Psychiatry, GATA Haydarpasa Training Hospital, Istanbul, Turkey
M.E. Erdal
Affiliation:
Department of Medical Biology and Genetics, Medical Faculty of Mersin University, Mersin, Turkey
Ayhan Algül
Affiliation:
Department of Psychiatry, GATA Haydarpasa Training Hospital, Istanbul, Turkey
Ozlem I. Ay
Affiliation:
Department of Medical Biology and Genetics, Medical Faculty of Mersin University, Mersin, Turkey
M.A. Ateş
Affiliation:
Department of Psychiatry, GATA Haydarpasa Training Hospital, Istanbul, Turkey
Handan Camdeviren
Affiliation:
Department of Biostatistics, Medical Faculty of Duzce University, Düzce, Turkey
Cengiz Basoglu
Affiliation:
Department of Psychiatry, GATA Haydarpasa Training Hospital, Istanbul, Turkey
Hasan Herken
Affiliation:
Department of Psychiatry, Faculty of Medicine, Pamukkale University, Denizli, Turkey
*
I. Omer Barlas, Department of Medical Biology and Genetics, Medical Faculty of Mersin University, Yenisehir Kampusu, 33160 Mersin, Turkey. Tel: +903243412815/1071; Fax: +903243412400; E-mail: iobarlas@gmail.com
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Extract

Objectives: The heterogeneity of schizophrenia mainly results from variations in clinical expressions of the disease, such as age at onset, gender differences in onset of illness, symptoms and response to antipsychotic treatment. Enhanced sensitisation of dopamine pathways in males, having consistently an earlier onset, might be implicated as disease modifiers for schizophrenia in males.

Methods: In this study, we performed a case (n = 87)-control (n = 100) association study between the DBH5′-ins/del and DBH-444g/a polymorphisms of the DBH gene and also compared the level of psychotic symptoms between patients with different DBH genotypes/haplotypes with respect to antipsychotic therapeutic response and gender difference.

Results: No significant differences between allele and genotype and haplotype frequencies at either groups (p < 0.05). When the age is considered in patient group, a significant difference was observed between patients with ID genotype and with II genotype (p = 0.018). Patients with ID genotype have been diagnosed as schizophrenics in early ages when compared to II genotype carriers. We also found a significant difference between II and ID genotype (p = 0.007) when the gender had taken into account, showing that the ID genotype carriers had an early onset to schizophrenia.

Conclusions: This association was more significant in male schizophrenia patients than females. Thus, this finding may constitute a novel biological support for the prior finding that onset of schizophrenia varies with gender. The results also showed that critical genetic vulnerability may be associated with the presence or absence of the ID genotype of DBH5′-ins/del.

Keywords

age at onsetdopamine beta hydroxylasemale genderpolymorphismschizophrenia
Type
Research Article
Information
Acta Neuropsychiatrica , Volume 24 , Issue 3 , June 2012 , pp. 176 - 182
Copyright
Copyright © Cambridge University Press 2011

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