Genetic variation in APOJ, LPL, and TNFRSF10B affects plasma fatty acid distribution in Alaskan Eskimos.
BACKGROUND
Alterations in plasma fatty acid distribution are linked to metabolic abnormalities related to type 2 diabetes and cardiovascular disease.


OBJECTIVE
The aim of this study was to investigate genetic factors influencing plasma fatty acid distribution in Alaskan Eskimos from the Genetics of Coronary Artery Disease in Alaska Natives (GOCADAN) study.


METHODS
Fatty acids in plasma were measured by gas chromatography in 761 related individuals (>35 y of age).


RESULTS
Quantitative genetic analyses showed that fatty acid distribution is significantly heritable (P < 0.001), with heritabilities ranging from 0.33 to 0.55. A genome-wide scan for plasma fatty acids identified a 20-cM region on chromosome 8 (p12-p21) with a quantitative trait locus for monounsaturated fatty acids (logarithm of odds score = 3.8). The same region had a quantitative trait locus for polyunsaturated fatty acids (logarithm of odds score = 2.6). We genotyped single nucleotide polymorphisms (SNPs) in candidate genes in 8p12-p21 and found a significant association between fatty acids and SNPs in apolipoprotein J (APOJ), lipoprotein lipase (LPL), macrophage scavenger receptor 1 (MSR1), and tumor necrosis factor receptor superfamily member 10b (TNFRSF10B). A Bayesian quantitative trait nucleotide analysis based on a measured genotype model showed that SNPs in LPL, TNFRSF10B, and APOJ had strong statistical evidence of a functional effect (posterior probability > or =75%) on plasma fatty acid distribution.


CONCLUSIONS
The results indicate that there is strong genetic influence on plasma fatty acid distribution and that genetic variation in APOJ, LPL, and TNFRSF10B may play a role. The GOCADAN study was registered at www.clinicaltrials.gov as NCT00006192.
Voruganti
V Saroja
VS
Department of Genetics, Southwest Foundation for Biomedical Research, San Antonio, TX 78245-0549, USA. svorugan@sfbrgenetics.org <svorugan@sfbrgenetics.org>
Cole
Shelley A
SA
Ebbesson
Sven O E
SO
Göring
Harald H H
HH
Haack
Karin
K
Laston
Sandra
S
Wenger
Charlotte R
CR
Tejero
M Elizabeth
ME
Devereux
Richard B
RB
Fabsitz
Richard R
RR
MacCluer
Jean W
JW
Umans
Jason G
JG
Howard
Barbara V
BV
Comuzzie
Anthony G
AG
D002318:Cardiovascular Diseases / Q000097:blood / Q000235:genetics*; D051152:Clusterin / Q000235:genetics* / Q000378:metabolism; D004247:DNA / Q000737:chemistry / Q000235:genetics; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000235:genetics*; D005230:Fatty Acids, Nonesterified / Q000097:blood*; D005260:Female; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D004930:Inuit / Q000235:genetics*; D008071:Lipoprotein Lipase / Q000235:genetics* / Q000378:metabolism; D008297:Male; D016133:Polymerase Chain Reaction; D020641:Polymorphism, Single Nucleotide; D019655:Quantitative Trait, Heritable; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand / Q000235:genetics* / Q000378:metabolism; D051117:Scavenger Receptors, Class A / Q000235:genetics / Q000378:metabolism
D051152:Clusterin; D005230:Fatty Acids, Nonesterified; C495139:MSR1 protein, human; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D051117:Scavenger Receptors, Class A; C505639:TNFRSF10B protein, human; D004247:DNA; D008071:Lipoprotein Lipase
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