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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
Targeted mutations of breast cancer susceptibility gene homologs in mice: lethal phenotypes of Brca1, Brca2, Brca1/ Brca2, Brca1/ p53, and Brca2/ p53 nullizygous embryos.
Mutations of the human BRCA1 and BRCA2 genes encoding tumor suppressors have been implicated in inherited predisposition to breast and other cancers. Disruption of the homologous mouse genes Brca1 and Brca2 by targeting showed that they both have indispensable roles during embryogenesis, because nullizygous embryos become developmentally retarded and disorganized, and die early in development. In Brca1 mutants, the onset of abnormalities is earlier by one day and their phenotypic features and time of death are highly variable, whereas the phenotype of Brca2 null embryos is more uniform, and they all survive for at least 8.5 embryonic days. Observations with Brca1/ Brca2 double nullizygotes raise the possibility that the two developmental pathways could be linked. Interestingly, the impact of the Brca1 or Brca2 null mutation is less severe in a p53 null background.[1]
