Cardiovascular DiseasesNCT00005325
Identifying Genes Involved in Abnormal Blood Pressure - Hypertension SCOR
An observational study of Cardiovascular Diseases and Heart Diseases, run by Boston University.
Trial summary
To seek out genes or genetic markers which identify subjects more vulnerable to hypertension under the influence of environmental factors. Read more about this study
- Who is it for?
- Any age
- Conditions the study is for
- Cardiovascular Diseases, Heart Diseases, Hypertension
- How many people
- Not given
- Where
- No sites listed yet
- Study dates
- Feb 1996to Jul 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 Any age
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
No eligibility criteria
About this study
To seek out genes or genetic markers which identify subjects more vulnerable to hypertension under the influence of environmental factors.
Read the detailed description
BACKGROUND:
Essential hypertension is a multifactorial disorder with a Gaussian distribution and with a genetic component that appears to be polygenic and heterogeneous. The studies require clinical knowledge of the pathophysiology and therapy of hypertension, availability of a large racially diverse patient population and a General Clinical Research Center for recruitment, characterization and classification of subjects, in combination with knowledge of molecular biology for DNA preparation and expertise in molecular genetics and molecular epidemiology for genetic analysis.
The study is part of a Specialized Centers of Research initiative in the Molecular Genetics of Hypertension. The initiative originated in deliberations of the September 1992 National Heart, Lung, and Blood Advisory Council. In May 1993, a program evaluation committee convened by the NHLBI was charged with the task of assessing the overall goals of the Hypertension SCOR program and of recommending areas of future need. The committee's recommendations formed the basis of this proposed initiative which was released as a Request for Applications in December, 1993.
DESIGN NARRATIVE:
The study, a subproject within a Hypertension Specialized Center of Research (SCOR), had five substudies between 1996 and 2001. The first classified hypertensives into relatively homogeneous subgroups according to intermediate phenotypes based on heritable biological traits, including anthropometric and neurohumoral data obtained by submitting selected subjects to a 3-day inpatient protocol, from which data were extrapolated and applied to stratify larger subject populations in order to enhance efficacy of subsequent genetic analysis. The second substudy genotyped subjects for chromosomal loci using approximately 350 highly polymorphic microsatellite markers spaced every 5-10 centimorgans (cM) along each chromosome. The strategy was to initially type markers in a select group of hypertensive kindreds that independently demonstrated linkage. The third substudy analyzed the genetic marker data for linkage using both parametric (lod score) and nonparametric (affected-pedigree-member) methods. Suggestive findings were pursued in the sib-pairs. The fourth substudy used the case-control method to confirm positive linkage from substudy 3 and to identify particular allele associations using methods of linkage disequilibrium and DNA pooling. The fifth substudy screened and assessed mutations in candidate genes linked to hypertension in patients and controls. A collaboration was established with the Framingham Heart Study, with linkage analyses conducted for hypertension in this cohort.
The subproject was renewed in February 2001 through 2006 to continue the clinical studies and to expand the collection of hypertensive families, including subjects who have undergone extensive clinical evaluation and who can be subgrouped into intermediate phenotypes, as well as families from genetically isolated populations from Greece, Israel, and South Africa. Various subsets of this population will be submitted to different genetic analyses as appropriate, including linkage and association studies, genome-wide scan for genetic isolates, evaluation of single nucleotide polymorphisms in selected genes, testing of quantitative trait loci (QTL) by micro satellite markers and mapping of promising marrow regions by DNA sequencing.
- Conditions
- Cardiovascular Diseases, Heart Diseases, Hypertension
- Medical subject headings
- Cardiovascular Diseases, Heart Diseases, Hypertension
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted26 May 2000 (estimated)
- Study startFeb 1996
- Primary completionJul 2006
- Study completionJul 2006
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (7)Papers the sponsor has linked to this study.
- Other trials for Cardiovascular DiseasesStudies of the same condition, open and under way.
- More trials run by Boston UniversityThe sponsor's other registered studies.
- 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
Sponsor and investigators
- Lead sponsor
- Boston University
- Sponsor type
- University, hospital or other
- Collaborators
- National Heart, Lung, and Blood Institute (NHLBI)
- Investigators
- Haralambos Gavras, Boston University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00005325
- Sponsor's protocol ID
- 4109
- Other IDs
- P50HL055001
- Status last verified
- Jul 2014
- First submitted
- 25 May 2000
- Last updated
- 16 Jul 2014
- Results posted
- No
Publications
Baima J, Nicolaou M, Schwartz F, DeStefano AL, Manolis A, Gavras I, Laffer C, Elijovich F, Farrer L, Baldwin CT, Gavras H. Evidence for linkage between essential hypertension and a putative locus on human chromosome 17. Hypertension. 1999 Jul;34(1):4-7. doi: 10.1161/01.hyp.34.1.4.
PubMed 10406815Levy D, DeStefano AL, Larson MG, O'Donnell CJ, Lifton RP, Gavras H, Cupples LA, Myers RH. Evidence for a gene influencing blood pressure on chromosome 17. Genome scan linkage results for longitudinal blood pressure phenotypes in subjects from the framingham heart study. Hypertension. 2000 Oct;36(4):477-83. doi: 10.1161/01.hyp.36.4.477.
PubMed 11040222Nicolaou M, DeStefano AL, Gavras I, Cupples LA, Manolis AJ, Baldwin CT, Gavras H, Farrer LA. Genetic predisposition to stroke in relatives of hypertensives. Stroke. 2000 Feb;31(2):487-92. doi: 10.1161/01.str.31.2.487.
PubMed 10657427Erlich PM, Cui J, Chazaro I, Farrer LA, Baldwin CT, Gavras H, DeStefano AL. Genetic variants of WNK4 in whites and African Americans with hypertension. Hypertension. 2003 Jun;41(6):1191-5. doi: 10.1161/01.HYP.0000070025.30572.91. Epub 2003 Apr 28.
PubMed 12719438Zhou XF, Cui J, DeStefano AL, Chazaro I, Farrer LA, Manolis AJ, Gavras H, Baldwin CT. Polymorphisms in the promoter region of catalase gene and essential hypertension. Dis Markers. 2005;21(1):3-7. doi: 10.1155/2005/487014.
PubMed 15735318Manolis AJ, Iraklianou S, Pittaras A, Zaris M, Tsioufis K, Psaltiras G, Psomali D, Foussas S, Gavras I, Gavras H. Arterial compliance changes in diabetic normotensive patients after angiotensin-converting enzyme inhibition therapy. Am J Hypertens. 2005 Jan;18(1):18-22. doi: 10.1016/j.amjhyper.2004.08.014.
PubMed 15691612Cui J, Melista E, Chazaro I, Zhang Y, Zhou X, Manolis AJ, Baldwin CT, Destefano AL, Gavras H. Sequence variation of bradykinin receptors B1 and B2 and association with hypertension. J Hypertens. 2005 Jan;23(1):55-62. doi: 10.1097/00004872-200501000-00013.
PubMed 15643125
Study at a glance
From the registry record, last updated by the sponsor on 16 Jul 2014. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Identifying Genes Involved in Abnormal Blood Pressure - Hypertension SCOR
- ClinicalTrials.gov ID
- NCT00005325
- Acronym / sponsor ID
- 4109
- Conditions
- Cardiovascular Diseases, Heart Diseases, Hypertension
- Study type
- Observational
- Recruitment status
- Completed
- Lead sponsor
- Boston UniversityUniversity, hospital or other
- Collaborators
- National Heart, Lung, and Blood Institute (NHLBI)
- Study start
- Feb 1996
- Primary completion
- Jul 2006 (actual)
- Study completion
- Jul 2006 (actual)
- First posted
- 26 May 2000 (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.
To seek out genes or genetic markers which identify subjects more vulnerable to hypertension under the influence of environmental factors.
Detailed description
BACKGROUND:
Essential hypertension is a multifactorial disorder with a Gaussian distribution and with a genetic component that appears to be polygenic and heterogeneous. The studies require clinical knowledge of the pathophysiology and therapy of hypertension, availability of a large racially diverse patient population and a General Clinical Research Center for recruitment, characterization and classification of subjects, in combination with knowledge of molecular biology for DNA preparation and expertise in molecular genetics and molecular epidemiology for genetic analysis.
The study is part of a Specialized Centers of Research initiative in the Molecular Genetics of Hypertension. The initiative originated in deliberations of the September 1992 National Heart, Lung, and Blood Advisory Council. In May 1993, a program evaluation committee convened by the NHLBI was charged with the task of assessing the overall goals of the Hypertension SCOR program and of recommending areas of future need. The committee's recommendations formed the basis of this proposed initiative which was released as a Request for Applications in December, 1993.
DESIGN NARRATIVE:
The study, a subproject within a Hypertension Specialized Center of Research (SCOR), had five substudies between 1996 and 2001. The first classified hypertensives into relatively homogeneous subgroups according to intermediate phenotypes based on heritable biological traits, including anthropometric and neurohumoral data obtained by submitting selected subjects to a 3-day inpatient protocol, from which data were extrapolated and applied to stratify larger subject populations in order to enhance efficacy of subsequent genetic analysis. The second substudy genotyped subjects for chromosomal loci using approximately 350 highly polymorphic microsatellite markers spaced every 5-10 centimorgans (cM) along each chromosome. The strategy was to initially type markers in a select group of hypertensive kindreds that independently demonstrated linkage. The third substudy analyzed the genetic marker data for linkage using both parametric (lod score) and nonparametric (affected-pedigree-member) methods. Suggestive findings were pursued in the sib-pairs. The fourth substudy used the case-control method to confirm positive linkage from substudy 3 and to identify particular allele associations using methods of linkage disequilibrium and DNA pooling. The fifth substudy screened and assessed mutations in candidate genes linked to hypertension in patients and controls. A collaboration was established with the Framingham Heart Study, with linkage analyses conducted for hypertension in this cohort.
The subproject was renewed in February 2001 through 2006 to continue the clinical studies and to expand the collection of hypertensive families, including subjects who have undergone extensive clinical evaluation and who can be subgrouped into intermediate phenotypes, as well as families from genetically isolated populations from Greece, Israel, and South Africa. Various subsets of this population will be submitted to different genetic analyses as appropriate, including linkage and association studies, genome-wide scan for genetic isolates, evaluation of single nucleotide polymorphisms in selected genes, testing of quantitative trait loci (QTL) by micro satellite markers and mapping of promising marrow regions by DNA sequencing.
Study design
Who may qualify
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
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 16 Jul 2014.
- Background: PubMed 10406815Baima J, Nicolaou M, Schwartz F, DeStefano AL, Manolis A, Gavras I, Laffer C, Elijovich F, Farrer L, Baldwin CT, Gavras H. Evidence for linkage between essential hypertension and a putative locus on human chromosome 17. Hypertension. 1999 Jul;34(1):4-7. doi: 10.1161/01.hyp.34.1.4.
- Background: PubMed 11040222Levy D, DeStefano AL, Larson MG, O'Donnell CJ, Lifton RP, Gavras H, Cupples LA, Myers RH. Evidence for a gene influencing blood pressure on chromosome 17. Genome scan linkage results for longitudinal blood pressure phenotypes in subjects from the framingham heart study. Hypertension. 2000 Oct;36(4):477-83. doi: 10.1161/01.hyp.36.4.477.
- Background: PubMed 10657427Nicolaou M, DeStefano AL, Gavras I, Cupples LA, Manolis AJ, Baldwin CT, Gavras H, Farrer LA. Genetic predisposition to stroke in relatives of hypertensives. Stroke. 2000 Feb;31(2):487-92. doi: 10.1161/01.str.31.2.487.
- Background: PubMed 12719438Erlich PM, Cui J, Chazaro I, Farrer LA, Baldwin CT, Gavras H, DeStefano AL. Genetic variants of WNK4 in whites and African Americans with hypertension. Hypertension. 2003 Jun;41(6):1191-5. doi: 10.1161/01.HYP.0000070025.30572.91. Epub 2003 Apr 28.
- Background: PubMed 15735318Zhou XF, Cui J, DeStefano AL, Chazaro I, Farrer LA, Manolis AJ, Gavras H, Baldwin CT. Polymorphisms in the promoter region of catalase gene and essential hypertension. Dis Markers. 2005;21(1):3-7. doi: 10.1155/2005/487014.
- Background: PubMed 15691612Manolis AJ, Iraklianou S, Pittaras A, Zaris M, Tsioufis K, Psaltiras G, Psomali D, Foussas S, Gavras I, Gavras H. Arterial compliance changes in diabetic normotensive patients after angiotensin-converting enzyme inhibition therapy. Am J Hypertens. 2005 Jan;18(1):18-22. doi: 10.1016/j.amjhyper.2004.08.014.
- Background: PubMed 15643125Cui J, Melista E, Chazaro I, Zhang Y, Zhou X, Manolis AJ, Baldwin CT, Destefano AL, Gavras H. Sequence variation of bradykinin receptors B1 and B2 and association with hypertension. J Hypertens. 2005 Jan;23(1):55-62. doi: 10.1097/00004872-200501000-00013.
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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.
Haralambos Gavras
Boston University
Questions about this trial
What is this clinical trial studying?
An observational study of Cardiovascular Diseases and Heart Diseases, run by Boston University.
The full registered description is in the About this study section and the official record.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 16 Jul 2014. Status can change between updates, so confirm with the study contact before making plans.
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?
On the ClinicalTrials.gov record for NCT00005325, which also lists 7 linked publications.
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 16 Jul 2014.