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Metabolomic Markers of Dietary Patterns in the Costa Rica Study

ABSTRACT: The study will examine associations between dietary patterns and the metabolome on a random subset (n=80) of control subjects in a population-based case-control study of myocardial infarction in Costa Rican adults. Each sample will undergo complementary LC-MS-based approaches, specifically untargeted metabolite profiling and targeted lipidomic profiling. Subsequently we will test for associations between 1) previously derived dietary patterns and plasma molecular features and 2) the top plasma correlates of dietary patterns and metabolic syndrome.

ORGANISM(S): Human Homo Sapiens

TISSUE(S): Blood

DISEASE(S): Metabolic Syndrome

SUBMITTER: Maureen Kachman

PROVIDER: ST000992 | MetabolomicsWorkbench | Mon Jun 25 00:00:00 BST 2018

REPOSITORIES: MetabolomicsWorkbench

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Project description:Objective: This work aimed at identifying and characterizing differences in subcutaneous adipose tissue (SAT) gene expression patterns between subjects succeeding weight control against subjects regaining weight 6 months after a low calorie diet program. Methods: Weight-reduced obese subjects from 8 European countries were randomized into 4 diets differing in protein and glycemic index. In addition to the anthropometric and plasma parameters, SAT biopsies were taken at the beginning (CID2) and the end (CID3) of the weight maintenance intervention. Pan-genomic cDNA microarrays were used to define SAT gene expression profiles at both CID2 and CID3 of 22 subjects succeeding weight maintenance (successful subjects; mean weight change= -2.6 ± 1.2 kg) and 22 subjects regaining weight (unsuccessful subjects; mean weight change= 3.9 ± 1.3 kg) among the 4 dietary arms. Results: Differences in SAT gene expression patterns between successful and unsuccessful groups were mainly due to weight variations rather to differences in diet macronutrient composition. An ANCOVA analysis with total energy intake at CID3 as covariant led us to the definition of 1339 differential genes. Functional analysis of differential genes showed that cellular growth and proliferation, inflammation, cell death, cancer, cellular function and maintenance were the main biological processes involving these differential genes. Overall design: SAT transcriptome was defined at the beginning (CID2) and at the end (CID3) of the dietary intervention program using a common reference design: Cyanine-5 dye was incorporated into all SAT samples, while a reference RNA pool made of the mix of commercial human liver, adipose tissue, and skeletal muscle RNA was labeled with cyanine-3 dye. Samples were hybridized to Agilent 44K whole human genome microarrays. Evolution in gene expression patterns after dietary intervention was tested in terms of the ratio after/before dietary intervention (CID3/CID2) ratio.

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Metabolomic Markers of Dietary Patterns in the Costa Rica Study

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