Cited by 887Bioinformatics and Genomic NetworksNutrition, Genetics, and DiseaseGenetic Associations and Epidemiology

Variations in DNA elucidate molecular networks that cause disease

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Chen, Yanqing, Zhu, Jun, Lum, Pek Yee, Yang, Xia, Pinto, Shirly, MacNeil, Douglas J., Zhang, Chunsheng, Lamb, John +14 more·2008·Nature

Abstract

Identifying variations in DNA that increase susceptibility to disease is one of the primary aims of genetic studies using a forward genetics approach. However, identification of disease-susceptibility genes by means of such studies provides limited functional information on how genes lead to disease. In fact, in most cases there is an absence of functional information altogether, preventing a definitive identification of the susceptibility gene or genes. Here we develop an alternative to the classic forward genetics approach for dissecting complex disease traits where, instead of identifying susceptibility genes directly affected by variations in DNA, we identify gene networks that are perturbed by susceptibility loci and that in turn lead to disease. Application of this method to liver and adipose gene expression data generated from a segregating mouse population results in the identification of a macrophage-enriched network supported as having a causal relationship with disease traits associated with metabolic syndrome. Three genes in this network, lipoprotein lipase (Lpl), lactamase beta (Lactb) and protein phosphatase 1-like (Ppm1l), are validated as previously unknown obesity genes, strengthening the association between this network and metabolic disease traits. Our analysis provides direct experimental support that complex traits such as obesity are emergent properties of molecular networks that are modulated by complex genetic loci and environmental factors.

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  • Genes with local eQTL are promising candidates for underlying disease-associated regions in human GWAS studies.

    “genes with local eQTL are promising candidates for underlying disease-associated regions in human GWAS studies (Knight 2005; Chen et al. 2008; Emilsson et al. 2008; Musunuru et al. 2010; Hou and Zhao 2013; Li et al. 2013).”

    From RNA-Seq Alignment to Individualized Genomes Improves Transcript Abundance Estimates in Multiparent Populations (2014) · cites this paper as Chen et al. 2008

    The passage on the chromosome 1 linkage region (labelled Abstract; page unavailable) reports that some genes with local cis-eQTL were statistically supported as contributing to metabolic traits. But those results come from a mouse cross, not human GWAS, and the paper does not establish that genes with local eQTL generally are promising candidates in human disease-associated regions. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • In biological networks, mathematical derivations show that only intra-modular hub genes are more relevant than other nodes, as opposed to inter-modular hub genes.

    “Hubs are frequently more relevant to the functionality of networks than other nodes [69]. This is also the case in biological networks [32], although mathematical derivations show that this is only the case for intra-modular hub genes (as opposed to inter-modular hub genes [64, 65]).”
  • The resulting modules from clustering often represent biological processes.

    “The resulting modules often represent biological processes [63, 64] and can be phenotype specific [65].”
  • Co-expression networks allow analysis of gene expression variation related to multiple disease-related and genetic traits.

    “As previously shown for complex diseases 12; 13 co-expression networks allow analysis of gene expression variation related to multiple disease-related and genetic traits.”

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Authors
Chen, Y., Zhu, J., Lum, P. Y., Yang, X., Pinto, S., MacNeil, D. J., Zhang, C., Lamb, J., Edwards, S., Sieberts, S. K., Leonardson, A., Castellini, L. W., Wang, S., Champy, M.-F., Zhang, B., Emilsson, V., Doss, S., Ghazalpour, A., Horvath, S., Drake, T. A., Lusis, A. J., & Schadt, E. E.
Affiliations
  • Merck & Co., Inc., Rahway, NJ, USA (United States) (US)
  • Centre National de la Recherche Scientifique (FR)
  • University of California, Los Angeles (US)
Corresponding author
Schadt, Eric E.
Venue
Nature
Published
2008-03
Volume
452
Issue
7186
Pages
429-435
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2091901410
Cited by
887
References
50
Citations by year
2026: 8 · 2025: 16 · 2024: 15 · 2023: 17 · 2022: 31 · 2021: 22 · 2020: 28 · 2019: 25 · 2018: 37 · 2017: 51 · 2016: 38 · 2015: 52 · 2014: 66 · 2013: 63 · 2012: 75
FWCI
46.85
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • HAL (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (P01HL030568, P01HL028481)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK071673)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioinformatics and Genomic Networks
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Nutrition, Genetics, and Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
Keywords
genetic susceptibility loci, gene regulatory networks, obesity, metabolic syndrome, lipoprotein lipase, adipose tissue gene expression, hepatic gene expression, disease networks, complex disease genetics, diabetes mellitus, atherosclerosis, body mass index
MeSH terms
Adipose Tissue, Animals, Female, Lipoprotein Lipase, Liver, Lod Score, Macrophages, Male, Membrane Proteins, Obesity, Phenotype, Phosphoprotein Phosphatases, Ribosomal Proteins, Genetic Variation, Reproducibility of Results, Linkage Disequilibrium, Apolipoprotein A-II, Genetic Predisposition to Disease, Metabolic Syndrome, Chromosomes, Mammalian, Quantitative Trait Loci, Mice, Gene Regulatory Networks

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