This proposal is to re-investigate, using metabolomic profiling and advanced genomics technologies, 92 Finnish pedigrees that were ascertained for two forms of complex heritable dyslipidemia: familial combined hyperlipidemia (FCHL) and low serum levels of high density lipoprotein cholesterol (HDL-C). These families were extensively phenotyped for metabolic measures and while linkage analyses yielded strong findings for FCHL and HDL-C in several chromosomal locations, identification of causal variants had been limited by the lack of sufficiently powerful technologies for both phenotypic and genotypic characterization. We now propose to re-analyze these families by obtaining new phenotypes hypothesized to more accurately reflect the biological underpinnings of dyslipidemias than the previously used composite lipid measures. The unique population structure of Finland provides special advantages for discovery of low frequency and rare disease- related variants in these families and opportunities for further validation of findings in several Finnish population cohorts In this project we will obtain metabolomic profiles on about 1400 members of these pedigrees. By combining whole genome sequencing (WGS) of the most genetically informative family members (about 300 individuals) with genome wide SNP genotyping of the entire pedigrees, we will establish a comprehensive catalog of variants segregating in these pedigrees. Phenotype-genotype correlations established by linkage and association analyses, along with bioinformatic analyses that detect likely deleterious variants, will enable us to identify the specific variants hat are candidates for contributing to the original and expanded set of metabolic phenotypes that we will obtain. Gene expression data to be obtained by RNA sequencing of blood samples from all available pedigree members (estimated to be about 900 individuals) will provide an additional form of evidence to prioritize candidate variants for metabolic phenotypes and may suggest relationships between genetic variation and gene function.

Public Health Relevance

Abnormalities in the concentration of lipoproteins within the blood increase the risk for cardiovascular diseases (CVD) and metabolic disorders such as type 2 diabetes (T2D). By using advanced technologies for profiling metabolism in families that were ascertained for such abnormalities by using whole genome sequencing to comprehensively catalog genetic variation within these families, and by quantifying variations between individuals in gene expression level, we will identify genetic variants that likely contribute to risk for CVD and T2D and shed new light on the biological underpinnings of these disorders.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
1R01HL113315-01
Application #
8284153
Study Section
Special Emphasis Panel (ZHL1-CSR-H (F2))
Program Officer
Jaquish, Cashell E
Project Start
2012-06-15
Project End
2017-03-31
Budget Start
2012-06-15
Budget End
2013-03-31
Support Year
1
Fiscal Year
2012
Total Cost
$539,949
Indirect Cost
$171,947
Name
University of California Los Angeles
Department
None
Type
Schools of Medicine
DUNS #
092530369
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
Service, Susan K; Teslovich, Tanya M; Fuchsberger, Christian et al. (2014) Re-sequencing expands our understanding of the phenotypic impact of variants at GWAS loci. PLoS Genet 10:e1004147