Letter | Published:

Trisomy represses ApcMin-mediated tumours in mouse models of Down’s syndrome

Nature volume 451, pages 7375 (03 January 2008) | Download Citation

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Abstract

Epidemiological studies spanning more than 50 yr reach conflicting conclusions as to whether there is a lower incidence of solid tumours in people with trisomy 21 (Down’s syndrome)1,2. We used mouse models of Down’s syndrome and of cancer in a biological approach to investigate the relationship between trisomy and the incidence of intestinal tumours. ApcMin-mediated tumour number was determined in aneuploid mouse models Ts65Dn, Ts1Rhr and Ms1Rhr. Trisomy for orthologues of about half of the genes on chromosome 21 (Hsa21) in Ts65Dn mice or just 33 of these genes in Ts1Rhr mice resulted in a significant reduction in the number of intestinal tumours. In Ms1Rhr, segmental monosomy for the same 33 genes that are triplicated in Ts1Rhr resulted in an increased number of tumours. Further studies demonstrated that the Ets2 gene contributed most of the dosage-sensitive effect on intestinal tumour number. The action of Ets2 as a repressor when it is overexpressed differs from tumour suppression, which requires normal gene function to prevent cellular transformation. Upregulation of Ets2 and, potentially, other genes involved in this kind of protective effect may provide a prophylactic effect in all individuals, regardless of ploidy.

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Acknowledgements

The authors thank L. Siracusa for advice regarding the ApcMin system, C. Dang for important discussions regarding cancer models, and R. Roper for statistical advice. This work was supported by National Institute of Child Health and Development and National Cancer Institute awards (M.C.O. and R.H.R.).

Author Contributions T.E.S. and R.H.R. designed the experiments. T.E.S. and A.Y. managed husbandry and collected tumour data, which were analysed by T.E.S., A.Y. and R.H.R.; F.L. and M.C.O. designed the Ets2 conditional knockout mice; and A.Y., F.L. and M.C.O. analysed Ets2 expression. R.H.R. wrote the paper with substantial input from all authors.

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Author notes

    • Thomas E. Sussan

    Present address: Department of Environmental Health Sciences, Bloomberg School of Public Health, Baltimore, Maryland 21205, USA.

Affiliations

  1. Department of Physiology and The Institute for Genetic Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA

    • Thomas E. Sussan
    • , Annan Yang
    •  & Roger H. Reeves
  2. Department of Molecular and Cellular Biochemistry, Ohio State University, Columbus, Ohio 43210, USA

    • Fu Li
    •  & Michael C. Ostrowski

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Correspondence to Roger H. Reeves.

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https://doi.org/10.1038/nature06446

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