title: How to identify essential genes from molecular networks?
abstract: BACKGROUND
  The prediction of essential genes from molecular networks is a way to test the understanding of essentiality in the context of what is known about the network. However, the current knowledge on molecular network structures is incomplete yet, and consequently the strategies aimed to predict essential genes are prone to uncertain predictions. We propose that simultaneously evaluating different network structures and different algorithms representing gene essentiality (centrality measures) may identify essential genes in networks in a reliable fashion.
  
  
  RESULTS
  By simultaneously analyzing 16 different centrality measures on 18 different reconstructed metabolic networks for Saccharomyces cerevisiae, we show that no single centrality measure identifies essential genes from these networks in a statistically significant way; however, the combination of at least 2 centrality measures achieves a reliable prediction of most but not all of the essential genes. No improvement is achieved in the prediction of essential genes when 3 or 4 centrality measures were combined.
  
  
  CONCLUSIONS
  The method reported here describes a reliable procedure to predict essential genes from molecular networks. Our results show that essential genes may be predicted only by combining centrality measures, revealing the complex nature of the function of essential genes.
authors.affiliation: Department of Biochemistry and Structural Biology, Universidad Nacional Autónoma de México, Instituto de Fisiología Celular, 04510 México DF, México. gdelrio@ifc.unam.mx
authors.forename: Gabriel
authors.initials: G
authors.lastname: del Rio
authors.forename: Dirk
authors.initials: D
authors.lastname: Koschützki
authors.forename: Gerardo
authors.initials: G
authors.lastname: Coello
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D003627:Data Interpretation, Statistical; D008954:Models, Biological; D015233:Models, Statistical; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*
chemical_list: D029701:Saccharomyces cerevisiae Proteins