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This article is part of the supplement: Proceedings of the 2011 International Conference on Bioinformatics and Computational Biology (BIOCOMP'11)

Open Access Research

Integrated lipidomics and transcriptomic analysis of peripheral blood reveals significantly enriched pathways in type 2 diabetes mellitus

Chen Zhao12, Jinghe Mao3, Junmei Ai4, Ming Shenwu3, Tieliu Shi2, Daqing Zhang5, Xiaonan Wang1, Yunliang Wang6* and Youping Deng1*

Author Affiliations

1 Wuhan University of Science and Technology, Wuhan, Hubei 430081, P.R. China

2 Center for Bioinformatics and Computational Biology, Shanghai Key Laboratory of Regulatory Biology, the Institute of Biomedical Sciences and School of Life Science, East China Normal University, Shanghai 200241, China

3 Department of Biology, Tougaloo College, Tougaloo, MS 39174, USA

4 Department of Internal Medicine, Rush University Cancer Center, Rush University Medical Center, Chicago, IL 60612, USA

5 Center for Systems Biology, School of Mathematical Sciences, Soochow University, Suzhou, Jiangsu 215006, China

6 Department of Neurology, The 148 Hospital of PLA, Zibo, Shandong, 255300, China

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BMC Medical Genomics 2013, 6(Suppl 1):S12  doi:10.1186/1755-8794-6-S1-S12

Published: 23 January 2013

Abstract

Background

Insulin resistance is a key element in the pathogenesis of type 2 diabetes mellitus. Plasma free fatty acids were assumed to mediate the insulin resistance, while the relationship between lipid and glucose disposal remains to be demonstrated across liver, skeletal muscle and blood.

Methods

We profiled both lipidomics and gene expression of 144 total peripheral blood samples, 84 from patients with T2D and 60 from healthy controls. Then, factor and partial least squares models were used to perform a combined analysis of lipidomics and gene expression profiles to uncover the bioprocesses that are associated with lipidomic profiles in type 2 diabetes.

Results

According to factor analysis of the lipidomic profile, several species of lipids were found to be correlated with different phenotypes, including diabetes-related C23:2CE, C23:3CE, C23:4CE, ePE36:4, ePE36:5, ePE36:6; race-related (African-American) PI36:1; and sex-related PE34:1 and LPC18:2. The major variance of gene expression profile was not caused by known factors and no significant difference can be directly derived from differential gene expression profile. However, the combination of lipidomic and gene expression analyses allows us to reveal the correlation between the altered lipid profile with significantly enriched pathways, such as one carbon pool by folate, arachidonic acid metabolism, insulin signaling pathway, amino sugar and nucleotide sugar metabolism, propanoate metabolism, and starch and sucrose metabolism. The genes in these pathways showed a good capability to classify diabetes samples.

Conclusion

Combined analysis of gene expression and lipidomic profiling reveals type 2 diabetes-associated lipid species and enriched biological pathways in peripheral blood, while gene expression profile does not show direct correlation. Our findings provide a new clue to better understand the mechanism of disordered lipid metabolism in association with type 2 diabetes.