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Letter

Nature Genetics 40, 1240–1244 (1 October 2008) | doi:10.1038/ng.211

Kras regulatory elements and exon 4A determine mutation specificity in lung cancer

Minh D To , Christine E Wong , Anthony N Karnezis , Reyno Del Rosario , Roberto Di Lauro & Allan Balmain

Kras is the most frequently mutated ras family member in lung carcinomas, whereas Hras mutations are common in tumors from stratified epithelia such as the skin. Using a Hras knock-in mouse model, we demonstrate that specificity for Kras mutations in lung and Hras mutations in skin tumors is determined by local regulatory elements in the target ras genes.