Schizoaffective psychoses: Genetical clues to classification

Department of Psychiatric Demography, Aarhus University Psychiatric Hospital, Denmark.
American Journal of Medical Genetics (Impact Factor: 3.23). 02/1995; 60(1):7-11. DOI: 10.1002/ajmg.1320600103
Source: PubMed

ABSTRACT The diagnostic classification of schizoaffective psychoses has varied much since Kasanin introduced the concept in 1933. The various classifications have agreed that schizoaffective psychoses present a combination of schizophreniform and affective symptoms, but the diagnostic criteria differ as to the number, quality, and time sequence of the symptoms even in recent classifications like RDC, DSM-III-R, and ICD-10. The classifications are syndromatical, and the etiology of the schizoaffective psychoses is still undetermined apart from evidence for a strong genetic factor. Results from family, twin, and adoption studies are divergent, but all the same, support a separate classification of broadly defined schizoaffective psychoses as possibly being phenotypical variations or expressions of genetic interforms between schizophrenia and affective psychoses.

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    ABSTRACT: The pharmacological treatment of schizoaffective disorders (SD) is usually carried out with antipsychotics, mood stabilizers and antidepressants. There is a lack of clinical trials specifically designed to assess the clinical response of schizoaffective patients to medication. Therefore, data on the treatment of patients with SD is largely derived from datasets of patients with schizophrenia and bipolar disorders. Research data support the idea of a continuum between bipolar and schizophrenic disorders. Both disorders can be treated with antipsychotics and this may reflect a common pathophysiological diathesis.
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    ABSTRACT: There is substantial evidence for partial overlap of genetic influences on schizophrenia and bipolar disorder, with family, twin, and adoption studies showing a genetic correlation between the disorders of around 0.6. Results of genome-wide association studies are consistent with commonly occurring genetic risk variants, contributing to both the shared and nonshared aspects, while studies of large, rare chromosomal structural variants, particularly copy number variants, show a stronger influence on schizophrenia than bipolar disorder to date. Schizoaffective disorder has been less investigated but shows substantial familial overlap with both schizophrenia and bipolar disorder. A twin analysis is consistent with genetic influences on schizoaffective episodes being entirely shared with genetic influences on schizophrenic and manic episodes, while association studies suggest the possibility of some relatively specific genetic influences on broadly defined schizoaffective disorder, bipolar subtype. Further insights into genetic relationships between these disorders are expected as studies continue to increase in sample size and in technical and analytical sophistication, information on phenotypes beyond clinical diagnoses are increasingly incorporated, and approaches such as next-generation sequencing identify additional types of genetic risk variant.
    Schizophrenia Bulletin 02/2014; 40(3). DOI:10.1093/schbul/sbu016 · 8.61 Impact Factor
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Sep 24, 2014