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Tumor-associated Apc mutations in Mlh1−/−Apc1638N mice reveal a mutational signature of Mlh1 deficiency

Abstract

Apc1638N mice, which are heterozygous for a germline mutation in Apc, typically develop three to five spontaneous intestinal tumors per animal. In most cases this is associated with allelic loss of wildtype Apc. We have previously reported that the multiplicity of intestinal tumors is increased dramatically by crossing Apc1638N with an Mlh1-deficient mouse strain that represents an animal model of hereditary non-polyposis colorectal cancer (HNPCC). The increased tumor multiplicity in these mice was associated with somatic mutations in the Apc tumor suppressor gene. Here, we have examined the nature and distribution of 91 Apc mutations implicated in the development of intestinal tumors in Mlh1−/−Apc1638N animals. Protein truncation mutations were detected in a majority of tumor samples, indicating that the prevailing mechanism of Apc mutation in tumors is altered from allelic loss to intragenic mutation as a result of Mlh1 deficiency. The observed mutations were a mixture of base substitutions (27%) and frameshifts (73%). Most frameshifts were detected within dinucleotide repeats and there were prominent mutational hotspots within sequences of this sort at codons 927–929, 1209–1211 and 1461–1464. The observed Apc mutations caused protein truncation upstream of the third 20 amino acid β-catenin binding domain and the first Axin-binding SAMP repeat, yielding Apc proteins that are predicted to be deficient in destabilizing β-catenin. Our results reveal a characteristic mutational signature in Apc that is attributable to Mlh1 deficiency. This demonstrates a direct effect of Mlh1 deficiency in the mutation of Apc in these tumors, and provides data that clarify the role of Mlh1 in mammalian DNA mismatch repair.

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Acknowledgements

We thank Louise Howe and Keith Brennan for comments on the manuscript. This work was supported by a postdoctoral fellowship from the Cancer Research Foundation of America (to M Karaguchi); an Irma T Hirschl Career Scientist Award (to A Brown); and by funding from NIH grants CA76329 (to W Edelmann), CA67944 and N01-CN-65031 (to M Lipkin and R Karaguchi), CA13330 to Albert Einstein College of Medicine, and CA29502 and CA47207 (to A Brown).

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Kuraguchi, M., Edelmann, W., Yang, K. et al. Tumor-associated Apc mutations in Mlh1−/−Apc1638N mice reveal a mutational signature of Mlh1 deficiency. Oncogene 19, 5755–5763 (2000). https://doi.org/10.1038/sj.onc.1203962

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