Identification of Genes Predisposing to Atherosclerosis

NCT ID: NCT00059098

Last Updated: 2016-07-12

Basic Information

• Recruitment Status: COMPLETED
• Study Classification: OBSERVATIONAL
• Study Start Date: 2003-03-31
• Study Completion Date: 2008-02-29

Brief Summary

To find genes important in the susceptibility to coronary heart disease.

Detailed Description

BACKGROUND:

Coronary heart disease (CHD) is a complex disorder constituting a major health problem in Western societies. The study assesses the unknown genetic background of CHD by investigating the most common familial dyslipidemia predisposing to CHD, familial combined hyperlipidemia (FCHL). The population prevalence of FCHL is estimated to be 1-2 percent and the disorder affects 10-20 percent of families with premature CHD. In FCHL, serum cholesterol, triglycerides, or both are elevated. Both environmental and genetic factors are suggested to affect the complex FCHL phenotype. Since the molecular basis of FCHL is unknown, a significant number of genetically predisposed individuals remain unidentified and exposed to premature CHD. The study uses samples from the genetically isolated population of Finland.

DESIGN NARRATIVE:

The investigators will use the unique study samples from the genetically isolated population of Finland and apply molecular genetic tools to first restrict the genetic locus they have identified and then to characterize the causative gene underlying the FCHL disorder on chromosome 1q21. Specifically, they first aim to further restrict the region by dissecting the different component traits. They will genotype an extended study sample consisting of all available family members of 61 FCHL families with dense sets of microsatellite markers and single nucleotide polymorphisms to fully utilize the refined quantitative phenotype information in fine mapping. Second, they aim to build a transcript map over the critical region on 1q21-q23 and to identify the causative FCHL gene among the regional candidate genes. This region on 1q21-q23 is orthologous to a region on mouse chromosome 3, where a locus (Hyplip 1) for combined hyperlipidemia has been identified. They have analyzed the human homolog of the Hyplip 1 gene but disappointingly, the human Hyplip 1 gene was found 10 Mb from the peak linkage markers and no evidence emerged for Hyplip 1 as a causative gene for FCHL. Their targets to identify the FCHL gene are currently the genes showing strongest association near the linkage peak. The FCHL gene will then be functionally characterized to prove the biological dysfunction. Characterizing one gene for FCHL would improve their understanding of molecular mechanisms of cardiovascular disease, and potentially lead to more accurate diagnosis, treatment and prevention.

Conditions

Cardiovascular Diseases; Coronary Disease; Heart Diseases

Eligibility Criteria

Inclusion Criteria

No eligibility criteria

• Maximum Eligible Age: 100 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

National Heart, Lung, and Blood Institute (NHLBI)

NIH

Sponsor Role: lead

Principal Investigators

Leena Peltonen

Role:

University of California, Los Angeles

References

Lilja HE, Suviolahti E, Soro-Paavonen A, Hiekkalinna T, Day A, Lange K, Sobel E, Taskinen MR, Peltonen L, Perola M, Pajukanta P. Locus for quantitative HDL-cholesterol on chromosome 10q in Finnish families with dyslipidemia. J Lipid Res. 2004 Oct;45(10):1876-84. doi: 10.1194/jlr.M400141-JLR200. Epub 2004 Jul 16.

Reference Type: BACKGROUND

PMID: 15258200 (View on PubMed)

Cantor RM, Chen GK, Pajukanta P, Lange K. Association testing in a linked region using large pedigrees. Am J Hum Genet. 2005 Mar;76(3):538-42. doi: 10.1086/428628. Epub 2005 Jan 18.

Reference Type: BACKGROUND

PMID: 15657872 (View on PubMed)

Other Identifiers

R01HL070150

Identifier Type: NIH

Identifier Source: secondary_id

View Link

1211

Identifier Type: -

Identifier Source: org_study_id