Early TP53 alterations engage environmental exposures to promote gastric premalignancy in an integrative mouse model.

Abstract:

:Somatic alterations in cancer genes are being detected in normal and premalignant tissue, thus placing greater emphasis on gene-environment interactions that enable disease phenotypes. By combining early genetic alterations with disease-relevant exposures, we developed an integrative mouse model to study gastric premalignancy. Deletion of Trp53 in gastric cells confers a selective advantage and promotes the development of dysplasia in the setting of dietary carcinogens. Organoid derivation from dysplastic lesions facilitated genomic, transcriptional and functional evaluation of gastric premalignancy. Cell cycle regulators, most notably Cdkn2a, were upregulated by p53 inactivation in gastric premalignancy, serving as a barrier to disease progression. Co-deletion of Cdkn2a and Trp53 in dysplastic gastric organoids promoted cancer phenotypes but also induced replication stress, exposing a susceptibility to DNA damage response inhibitors. These findings demonstrate the utility of mouse models that integrate genomic alterations with relevant exposures and highlight the importance of gene-environment interactions in shaping the premalignant state.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Sethi NS,Kikuchi O,Duronio GN,Stachler MD,McFarland JM,Ferrer-Luna R,Zhang Y,Bao C,Bronson R,Patil D,Sanchez-Vega F,Liu JB,Sicinska E,Lazaro JB,Ligon KL,Beroukhim R,Bass AJ

doi

10.1038/s41588-019-0574-9

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

219-230

issue

2

eissn

1061-4036

issn

1546-1718

pii

10.1038/s41588-019-0574-9

journal_volume

52

pub_type

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