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CompletedNCT00549991Updated Sep 10, 2025

Analyzing Genes That May Increase the Risk of Developing High Blood Pressure

An observational study in Hypertension, sponsored by Case Western Reserve University. Completed at 1 site in United States. Open to participants aged 21 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-09-10.

Sponsored by Case Western Reserve University · Observational

Study type
Observational
Model
Case-only
Time perspective
Retrospective
Enrollment
8,687
Ages
21 Years and older
Sex
All
01

Study summary

High blood pressure is one of the most common health problems in the United States. Genetic variations may cause some people to be more susceptible to developing high blood pressure. This study will identify variations in genes known to play a part in the development of high blood pressure.

Read the detailed description

High blood pressure affects nearly one third of all individuals in the United States. It is especially common in African Americans, with more than 40% of African Americans diagnosed with this condition. High blood pressure usually develops earlier in life and is more severe in African Americans than in other racial or ethnic groups. Many factors can cause high blood pressure, including stress, diet, diabetes, kidney disease, or obesity. Previous studies have also shown that genetic variations on two regions of chromosomes 6 and 21 may predispose some people to develop high blood pressure. Admixture mapping is a type of genetic analysis that aims to identify disease-causing genetic variations across different populations of people. Using admixture mapping, this study will examine previously collected genetic samples from African American participants in the Family Blood Pressure Program (FBPP) study and from African American, Mexican American, Nigerian, and Jamaican participants enrolled in other clinical studies. Study researchers will analyze the samples to identify and characterize genetic variations that are associated with an increased risk of high blood pressure in the African American population, as well as other racial and ethnic groups.

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Conditions studied

  • Hypertension

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Keywords

  • High Blood Pressure
03

In context

Hypertension

6,689 studies on the registry are indexed under Hypertension; 965 are open to participants now.

This study's enrollment of 8,687 is above the median of 210 across 1,359 observational studies indexed under Hypertension.

Browse Hypertension studies →

Lead sponsor

Case Western Reserve University is the lead sponsor of 158 studies on the registry; 29 are open to participants now.

Of its 9 completed or terminated interventional studies of FDA-regulated products, 6 (67%) have results posted.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
21 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Probability sample

Study population

Previously collected genetic samples from African American participants in the Family Blood Pressure Program (FBPP) study and from African American, Mexican American, Nigerian, and Jamaican participants enrolled in other clinical studies will be examined.

Eligibility criteria

Inclusion Criteria:

  • Participated in the FBPP study (African American [800 people with high blood pressure and 800 control group participants] and Mexican American participants)
  • Participated in the American Family Study (African American participants)
  • Participated in the Phenotyping Study (African American, Nigerian, and Jamaican participants)
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Study design

Observational model
Case-only
Time perspective
Retrospective
Enrollment
8,687 participants (actual)
Biospecimen retention
Samples with dna
06

What researchers measure

Primary outcomes

  1. Genetic variations

    Time frame: Measured through admixture mapping genetic analysis

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Study locations

1 site
  • Case Western Reserve University
    Cleveland, Ohio 44106, United States
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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Sep 10, 2025, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT00549991
Lead sponsor
Case Western Reserve University
Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
Responsible party
Sponsor
First posted
Oct 26, 2007
Start date
Aug 2007
Primary completion
Jun 2012
Completion
Jun 2012
Last update
Sep 10, 2025

Study contacts

Xiaofeng Zhu, PhD
principal investigator · Case Western Reserve University

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Sep 2025. You cannot join it, but the record below documents what was studied.

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