Genomics

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Mutant p53R270H drives altered metabolism and increased invasion in pancreatic ductal adenocarcinoma


ABSTRACT: Pancreatic cancer is characterized by nearly universal activating mutations in KRAS. Among other somatic mutations, TP53 is mutated in more than 75% of human pancreatic tumors. Genetically engineered mice have proven instrumental in studies of the contribution of individual genes to carcinogenesis. Oncogenic Kras mutations occur early during pancreatic carcinogenesis and are considered an initiating event. In contrast, mutations in p53 occur later during tumor progression. In our model, we recapitulated the order of mutations of the human disease, with p53 mutation following expression of oncogenic Kras. Further, using an inducible and reversible expression allele for mutant p53, we inactivated its expression at different stages of carcinogenesis. Notably, the function of mutant p53 changes at different stages of carcinogenesis. Our work establishes a requirement for mutant p53 for the formation and maintenance of pancreatic cancer precursor lesions. In tumors, mutant p53 becomes dispensable for growth. However, it maintains the altered metabolism that characterizes pancreatic cancer and mediates its malignant potential. Further, mutant p53 promotes epithelial-mesenchymal transition (EMT) and cancer cell invasion. This work generates new mouse models that mimic human pancreatic cancer and expands our understanding of the role of p53 mutation, common in the majority of human malignancies. Overall design: This study consists of 12 RNA-seq samples. These samples were isolated from subcutaneous tumors of KCip53-1 cells grown in NSG mice. Tumor treatment consisted of three groups: animals treated with dox for the entire course of the experiment (Dox), animals never treated with dox (No Dox), and animals who began the experiment on dox and then had it removed (Off Dox). In the KCip53-1 mouse pancreatic cancer cell line, dox induces the expression of mutant p53R270H.

INSTRUMENT(S): Illumina HiSeq 4000 (Mus musculus)

SUBMITTER: Mats Ljungman  

PROVIDER: GSE106853 | GEO | 2018-09-05

REPOSITORIES: GEO

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Pancreatic cancer is characterized by nearly universal activating mutations in KRAS. Among other somatic mutations, TP53 is mutated in more than 75% of human pancreatic tumors. Genetically engineered mice have proven instrumental in studies of the contribution of individual genes to carcinogenesis. Oncogenic Kras mutations occur early during pancreatic carcinogenesis and are considered an initiating event. In contrast, mutations in p53 occur later during tumor progression. In our model, we recap  ...[more]

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