Evaluating Genetic Risk Factors for Childhood-Onset Schizophrenia
Stopped early
Conditions studied: Psychosis, Schizophrenia, Genetic Structure, Childhood Onset Psychotic Disorders, Schizoaffective Disorder
In brief
A study of children and adolescents (current N=100) with very early onset by age 12 (COS) of DSM-III-R defined schizophrenia with (97-M-0126) is examining the clinical, neurobiological, early neurodevelopmental, genetic, and clinical drug response characteristics of these cases. Earlier studies have documented the continuity between COS and adult onset cases (See Jacobsen and Rapoport, 1998 for review). The focus has now shifted to increasing the sample size and evaluation of familial risk factors including: psychiatric diagnoses of family members; smooth pursuit eye movements; neuropsychological tests deficits, and obtaining blood for cell lines for genetic studies (family members only, this is also covered under 96-M-0060, Dr. Ellen Sidransky). A study of obstetrical records of COS probands indicated no increase in adverse pre or perinatal events for these cases compared with obstetrical records of their siblings (Nicolson et al submitted). In contrast, several findings point to increased risk for these probands. To date, a total of 5 (10.4%) COS subjects were found to have previously unknown cytogenetic abnormalities (Microdeletion of 22q11 (3 cases), (Usiskin et al, submitted), Mosaic 45X0 (one case) (Kumra et al, 1998) and balanced 1:7 translocation (Gordon et al 1994). The study of first degree relatives of these very rare cases addresses the hypothesis that risk factors, most probably genetic, are increased in immediate family members relative both to community controls and to the relatives of patients with chronic, treatment resistant, adult-onset schizophrenia (AOS). A second hypothesis is that COS familial risk factors show significant relationship to the developmental delays/abnormalities being observed in the COS probands. As a total of 50 additional COS subjects will be studied over the next 5 years, the pediatric control sample for the probands will also be increased, determined by the need to have concurrent measures for patients and controls to maintain measurement validity. Thus a total of 600 additional subjects are to be studied including 50 controls for COS probands, 150 COS relatives, 150 controls for COS relatives, and 250 relatives of adult onset schizophrenics (AOS).
Key facts
- Study ID
- NCT00001198
- Run by
- National Institute of Mental Health (NIMH)
- People needed
- 1556
- Starts
- 1984-03-19
- Expected to finish
- 2017-10-10
- Last updated by the study team
- 2017-10-12
Who can join
Age: 6 and older. Sex: any. Healthy volunteers: accepted.
You may not qualify if…
- i.For Healthy Controls
- Evidence of medical or neurological disease
- Diagnosis of schizophrenia or schizoaffective disorder or in first-degree relatives by history, clinical interview, or by structured, diagnostic psychiatric interview (Diagnostic Interview for Children and Adolescents -IV)
- ii.For Relatives of Probands
- Absence of consent on the part of the proband or parent(s) of proband to contact relatives
- Absence of signed consent or assent by relative(s) to participate
- Lack of consent capacity
Where it is running
- National Institutes of Health Clinical Center, 9000 Rockville Pike — Bethesda, Maryland, United States
Full record on ClinicalTrials.gov
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