SchizophreniaNCT00562926
Single Nucleotide Polymorphism (SNP) in Schizophrenia and Schizophrenia Spectrum Disorders: a Population Association Analysis With Hong Kong Chinese
An observational study of Schizophrenia, run by Hospital Authority, Hong Kong at 4 sites in China.
Trial summary
Gamma-aminobutyric acid (GABA) is the principal inhibitory neurotransmitter in the mammalian central nervous system. It is involved in a wide spectrum of physiological functions, from sleep and sedation to convulsions. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Schizophrenia
- What is being tested?
- Extraction of 10ml blood sample for extraction of genomic DNA using DNA purification kits
- Type of treatment
- Surgery or procedure
- How many people
- 32 participants
- Where
- 4 sitesChina
- Study dates
- Jul 2004to Jun 2006
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- Adult, Older adult
Who may be able to join
- (For patients:)
- Diagnosis of schizophrenia under DSM-IV guidelines.
Who cannot join
- (For controls:)
- Subjects who are known to have blood transmitted disease.
- Past or current alcohol and /or substance abuse.
- Past or current major medical and neurological conditions.
- (For patients:)
- As for controls, excepr 3. "neurological conditions" does not include schizophrenia.
Trial locations and contacts
4 sites in 1 country.
China4 sites
NTE Cluster under HA
Hong Kong
Shatin Hospital
Hong Kong
Tai Po Hospital
Hong Kong
The Hong Kong University of Science and Technology
Hong Kong
About this study
Gamma-aminobutyric acid (GABA) is the principal inhibitory neurotransmitter in the mammalian central nervous system. It is involved in a wide spectrum of physiological functions, from sleep and sedation to convulsions. A defect in neurotransmission involving GABA in schizophrenia was first propsed in early 1970s, based on neuropathologcial evidence, yet there is a lack of molecular genetic evidence.
Recently, we carried out a pilot study on a region of the GABA-A receptor β2 subunit gene on chromosome 5 and found significant association for single nucleotide polymorphisms (SNPs) in the gene sequence with occurrence of schizophrenia. The current proposal aims to validate this important finding and to conduct a thorough scanning of the complete gene sequences of the GABA-A receptor subunit genes in this chromosomal region, including the three major subunits α1, β2 and γ2. We shall collect samples from Hong Kong Chinese subjects for a case-control study using haplotype maps and comparing the SNP haplotype frequencies in the receptor genes, and hence examine whether these genes are in association with schizophrenia, or other schizophrenia-spectrum disorders, including Alzheimer's disease presenting with psychotic symptoms.
Based on the observation that patients suffering from the catatonic subtype of schizophrenia respond particularly well to benzodiazepines, which bind specifically to GABA-A receptors, we shall also perform data analysis in terms of correlating SNP association with schizophrenia subtypes. Association of GABA-A receptor genes with schizophrenia would be a major step forward to determining whether these genes are susceptibility genes for schizophrenia, thereby paving the way to more effective diagnosis and treatment for this debilitating disease.
- Conditions
- Schizophrenia
- Being tested
- Extraction of 10ml blood sample for extraction of genomic DNA using DNA purification kits
- Keywords
- Schizophrenia, Schizophrenia spectrum disorder
- Medical subject headings
- Schizophrenia
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Extraction of 10ml blood sample for extraction of genomic DNA using DNA purification kitsProcedure or surgery
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted26 Nov 2007 (estimated)
- Study startJul 2004
- Study completionJun 2006
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for SchizophreniaStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Time perspective
- Prospective
- Enrolment
- 32 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Hospital Authority, Hong Kong
- Sponsor type
- Other government
- Collaborators
- Chinese University of Hong Kong
- Investigators
- Dicky WS Chung, Dr, Principal investigator, Department of Psychiatry, Tai Po Hospital
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00562926
- Sponsor's protocol ID
- CREC-2004, 247
- Other IDs
- HARECCTR0500025
- Status last verified
- Aug 2013
- First submitted
- 21 Nov 2007
- Last updated
- 22 Aug 2013
- Results posted
- No
Study at a glance
From the registry record, last updated by the sponsor on 22 Aug 2013. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Single Nucleotide Polymorphism (SNP) in Schizophrenia and Schizophrenia Spectrum Disorders: a Population Association Analysis With Hong Kong Chinese
- ClinicalTrials.gov ID
- NCT00562926
- Acronym / sponsor ID
- CREC-2004, 247
- Conditions
- Schizophrenia
- Keywords
- Schizophrenia, Schizophrenia spectrum disorder
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 32 participants (estimated)
- Lead sponsor
- Hospital Authority, Hong KongOther government
- Collaborators
- Chinese University of Hong Kong
- Study start
- Jul 2004
- Study completion
- Jun 2006 (actual)
- First posted
- 26 Nov 2007 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Gamma-aminobutyric acid (GABA) is the principal inhibitory neurotransmitter in the mammalian central nervous system. It is involved in a wide spectrum of physiological functions, from sleep and sedation to convulsions. A defect in neurotransmission involving GABA in schizophrenia was first propsed in early 1970s, based on neuropathologcial evidence, yet there is a lack of molecular genetic evidence.
Recently, we carried out a pilot study on a region of the GABA-A receptor β2 subunit gene on chromosome 5 and found significant association for single nucleotide polymorphisms (SNPs) in the gene sequence with occurrence of schizophrenia. The current proposal aims to validate this important finding and to conduct a thorough scanning of the complete gene sequences of the GABA-A receptor subunit genes in this chromosomal region, including the three major subunits α1, β2 and γ2. We shall collect samples from Hong Kong Chinese subjects for a case-control study using haplotype maps and comparing the SNP haplotype frequencies in the receptor genes, and hence examine whether these genes are in association with schizophrenia, or other schizophrenia-spectrum disorders, including Alzheimer's disease presenting with psychotic symptoms.
Based on the observation that patients suffering from the catatonic subtype of schizophrenia respond particularly well to benzodiazepines, which bind specifically to GABA-A receptors, we shall also perform data analysis in terms of correlating SNP association with schizophrenia subtypes. Association of GABA-A receptor genes with schizophrenia would be a major step forward to determining whether these genes are susceptibility genes for schizophrenia, thereby paving the way to more effective diagnosis and treatment for this debilitating disease.
Study design
- Time perspective
- Prospective
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Age groups
- Adult, Older adult
Key inclusion criteria (2 listed)
- (For patients:)
- Diagnosis of schizophrenia under DSM-IV guidelines.
Key exclusion criteria (6 listed)
- (For controls:)
- Subjects who are known to have blood transmitted disease.
- Past or current alcohol and /or substance abuse.
- Past or current major medical and neurological conditions.
- (For patients:)
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Extraction of 10ml blood sample for extraction of genomic DNA using DNA purification kits | Procedure or surgery | – |
Primary outcome
Not reported in the source record.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 22 Aug 2013.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Dicky WS Chung, Dr principal investigator
Department of Psychiatry, Tai Po Hospital
4 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Schizophrenia, run by Hospital Authority, Hong Kong at 4 sites in China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 22 Aug 2013. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 4 sites in China. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 22 Aug 2013; AzTrials last refreshed its copy on 7 Nov 2026.