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Genetic Epidemiology of Subclinical Cardiovascular Disease and Osteoporosis Indices in African Ancestry Families

Kuipers, Allison Lindsay (2011) Genetic Epidemiology of Subclinical Cardiovascular Disease and Osteoporosis Indices in African Ancestry Families. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

Cardiovascular disease (CVD) is a major public health concern, especially in African ancestry populations, which have greater risk compared with Caucasians. Subclinical CVD measures provide information on the health of the vasculature and are predictive of future risk of clinical events. Vascular health indices have been associated with lower bone mineral density (BMD) and osteoporosis suggesting a potential common etiology. Intima-media thickness (IMT) and arterial diameter (adventitial diameter [AD] and lumen diameter [LD]) are subclinical CVD measures obtained by carotid ultrasound, whereas pulse pressure (PP) and pulse-wave velocity (PWV) are subclinical measures of arterial stiffness. The genetic influence on these subclinical CVD measures and in the link between CVD and osteoporosis has not been well defined in African ancestry populations. Therefore, we have estimated genetic heritability, genetic correlation of CVD and osteoporosis related traits, and performed univariate and bivariate genome-wide linkage analysis of these traits in 7 large, multigenerational families of African ancestry from the Caribbean island of Tobago. A total of 461 individuals aged ¡Ý18 years were included in these analyses from probands and families who were recruited without regard to their health status. After removing the effects of covariates, subclinical CVD traits were all heritable and there was significant phenotypic and genetic correlation between CVD and osteoporosis related traits. The most promising evidence of linkage was detected for AD-BMD trait-pairs on chromosome 14 (max LOD=5.2) in bivariate analysis and for AD and LD on chromosome 11 (max LOD=4.1) in univariate analysis. The linkage regions contain several genes known to be involved in cardiovascular disease including the ApoA1/C3/A4/A5 gene cluster, IL18, BMP4, and ESR2. Further studies of these regions may reveal novel insight into the genetic regulation of subclinical CVD and osteoporosis. These findings have public health significance because determining the genetic regulation of chronic disease may aid in risk prediction and, ultimately, minimize health disparities in African ancestry populations.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Kuipers, Allison Lindsaykuipers@pitt.eduKUIPERS
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairZmuda, Joesph Mzmudaj@edc.pitt.eduEPIDJMZ
Committee MemberKammerer, Candace Mcmk3@pitt.eduCMK3
Committee MemberBunker, Clareann Hbunkerc@pitt.eduBUNKERC
Committee MemberMiljkovic, Ivamiljkovici@edc.pitt.eduIVM1
Committee MemberSutton-Tyrrell, Kimtyrrell@edc.pitt.edu
Date: 29 June 2011
Date Type: Completion
Defense Date: 31 March 2011
Approval Date: 29 June 2011
Submission Date: 21 March 2011
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Institution: University of Pittsburgh
Schools and Programs: Graduate School of Public Health > Epidemiology
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Afro-Caribbean; arterial diameter; bone mineral density; genome-wide linkage analysis; heritability; intima-media thickness; pulse pressure; pulse-wave velocity
Other ID: http://etd.library.pitt.edu/ETD/available/etd-03212011-122313/, etd-03212011-122313
Date Deposited: 10 Nov 2011 19:32
Last Modified: 15 Nov 2016 13:37
URI: http://d-scholarship.pitt.edu/id/eprint/6546

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