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Variations in DNA elucidate molecular networks that cause disease.

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.

Pubmed ID: 18344982


  • Chen Y
  • Zhu J
  • Lum PY
  • Yang X
  • Pinto S
  • MacNeil DJ
  • Zhang C
  • Lamb J
  • Edwards S
  • Sieberts SK
  • Leonardson A
  • Castellini LW
  • Wang S
  • Champy MF
  • Zhang B
  • Emilsson V
  • Doss S
  • Ghazalpour A
  • Horvath S
  • Drake TA
  • Lusis AJ
  • Schadt EE



Publication Data

March 27, 2008

Associated Grants

  • Agency: NHLBI NIH HHS, Id: P01 HL028481
  • Agency: NHLBI NIH HHS, Id: P01 HL028481-24
  • Agency: NHLBI NIH HHS, Id: P01 HL028481-240010
  • Agency: NHLBI NIH HHS, Id: P01 HL030568
  • Agency: NHLBI NIH HHS, Id: P01 HL030568-250011
  • Agency: NIDDK NIH HHS, Id: R01 DK071673
  • Agency: NIDDK NIH HHS, Id: R01 DK071673-03

Mesh Terms

  • Adipose Tissue
  • Animals
  • Apolipoprotein A-II
  • Chromosomes, Mammalian
  • Female
  • Gene Regulatory Networks
  • Genetic Predisposition to Disease
  • Genetic Variation
  • Linkage Disequilibrium
  • Lipoprotein Lipase
  • Liver
  • Lod Score
  • Macrophages
  • Male
  • Membrane Proteins
  • Metabolic Syndrome X
  • Mice
  • Obesity
  • Phenotype
  • Phosphoprotein Phosphatases
  • Quantitative Trait Loci
  • Reproducibility of Results
  • Ribosomal Proteins