Genome-Scale Metabolic Reconstruction
A metabolic reconstruction provides a highly mathematical, structured platform on which to understand the systems biology of metabolic pathways within an organism. The integration of biochemical metabolic pathways with rapidly available, unannotated genome sequences has developed what are called genome-scale metabolic models. Simply put, these models correspond metabolic genes with metabolic pathways. In general, the more information about physiology, biochemistry and genetics is available for the target organism, the better the predictive capacity of the reconstructed models. Mechanically speaking, the process of reconstructing prokaryotic and eukaryotic metabolic networks is essentially the same. Having said this, eukaryote reconstructions are typically more challenging because of the size of genomes, coverage of knowledge, and the multitude of cellular compartments. The first genome-scale metabolic model was generated in 1995 for Haemophilus influenzae. The first multicellular organism, C. elegans, was reconstructed in 1998. Since then, many reconstructions have been formed. For a list of reconstructions that have been converted into a model and experimentally validated, see http://gcrg.ucsd.edu/InSilicoOrganisms/OtherOrganisms.
Organism | Genes in Genome | Genes in Model | Reactions | Metabolites | Date of reconstruction | Reference |
---|---|---|---|---|---|---|
Haemophilus influenzae | 1,775 | 296 | 488 | 343 | June 1999 | |
Escherichia coli | 4,405 | 660 | 627 | 438 | May 2000 | |
Saccharomyces cerevisiae | 6,183 | 708 | 1,175 | 584 | February 2003 | |
Mus musculus | 28,287 | 473 | 1220 | 872 | January 2005 | |
Homo sapiens | 21,090 | 3,623 | 3,673 | -- | January 2007 | |
Mycobacterium tuberculosis | 4,402 | 661 | 939 | 828 | June 2007 | |
Bacillus subtilis | 4,114 | 844 | 1,020 | 988 | September 2007 | |
Synechocystis sp. PCC6803 | 3,221 | 633 | 831 | 704 | October 2008 | |
Salmonella typhimurium | 4,489 | 1,083 | 1,087 | 774 | April 2009 | |
Arabidopsis thaliana | 27,379 | 1,419, | 1,567 | 1,748 | February 2010 |
Read more about this topic: Metabolic Network Modelling