Mouse development with a single E2F activator (original) (raw)

Nature volume 454, pages 1137–1141 (2008)Cite this article

Abstract

The E2F family is conserved from Caenorhabditis elegans to mammals, with some family members having transcription activation functions and others having repressor functions1,2. Whereas C. elegans3 and Drosophila melanogaster4,5 have a single E2F activator protein and repressor protein, mammals have at least three activator and five repressor proteins1,2,6. Why such genetic complexity evolved in mammals is not known. To begin to evaluate this genetic complexity, we targeted the inactivation of the entire subset of activators, E2f1, E2f2, E2f3a and E2f3b, singly or in combination in mice. We demonstrate that E2f3a is sufficient to support mouse embryonic and postnatal development. Remarkably, expression of E2f3b or E2f1 from the E2f3a locus (E2f3a 3bki or E2f3a 1ki , respectively) suppressed all the postnatal phenotypes associated with the inactivation of E2f3a. We conclude that there is significant functional redundancy among activators and that the specific requirement for E2f3a during postnatal development is dictated by regulatory sequences governing its selective spatiotemporal expression and not by its intrinsic protein functions. These findings provide a molecular basis for the observed specificity among E2F activators during development.

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Acknowledgements

We thank J. Moffitt and L. Rawahneh for histology expertise. We also thank J. Nevins, C. Bock and A. Otoshi for support in the generation of the E2f3a, E2f3b, E2f3a 3bki and E2f3a 1ki mice, and the Mouse Metabolic Phenotyping center at the University of Cincinnati for advice on the analysis of _E2f1_-/-_E2f3a_-/- mice. We are grateful to D. Guttridge, M. Ostrowski and M. Simcox for critically reading the manuscript and helpful suggestions. This work was funded by NIH grants to G.L. (R01CA85619, R01HD042619, R01CA121275, R01HD047470, P01CA097189), to L.W. (K01CA102328), DoD awards to A.d.B. (BC0300893) and J.-L.C. (BC061730), and a T32 fellowship (CA106196) to R.O. G.L. is the recipient of the Pew Charitable Trusts Scholar Award and the Leukemia and Lymphoma Society Scholar Award.

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Author notes

  1. Lizhao Wu
    Present address: Present address: Department of Cell Biology and Molecular Medicine and University Hospital Cancer Center, UMDNJ-New Jersey Medical School, Newark, New Jersey 07103, USA.,
  2. Shih-Yin Tsai, Rene Opavsky and Nidhi Sharma: These authors contributed equally to this work.

Authors and Affiliations

  1. Department of Molecular Genetics, College of Biological Sciences,
    Shih-Yin Tsai, Rene Opavsky, Nidhi Sharma, Lizhao Wu, Eric Nolan, Enrique Feria-Arias, Cynthia Timmers, Jana Opavska, Alain de Bruin, Jean-Leon Chong, Prashant Trikha & Gustavo Leone
  2. Human Cancer Genetics Program, Comprehensive Cancer Center,,
    Shih-Yin Tsai, Rene Opavsky, Nidhi Sharma, Lizhao Wu, Shan Naidu, Eric Nolan, Enrique Feria-Arias, Cynthia Timmers, Jana Opavska, Alain de Bruin, Jean-Leon Chong, Prashant Trikha & Gustavo Leone
  3. Department of Molecular Virology Immunology and Medical Genetics, College of Medicine,
    Shih-Yin Tsai, Rene Opavsky, Nidhi Sharma, Lizhao Wu, Shan Naidu, Eric Nolan, Enrique Feria-Arias, Cynthia Timmers, Jana Opavska, Alain de Bruin, Jean-Leon Chong, Prashant Trikha & Gustavo Leone
  4. Department of Veterinary Biosciences, College of Veterinary Medicine, and,
    Shan Naidu, Paul Stromberg & Thomas J. Rosol
  5. Center for Biostatistics, The Ohio State University, Columbus, Ohio 43210, USA ,
    Soledad A. Fernandez

Authors

  1. Shih-Yin Tsai
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  2. Rene Opavsky
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  3. Nidhi Sharma
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  4. Lizhao Wu
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  5. Shan Naidu
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  6. Eric Nolan
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  7. Enrique Feria-Arias
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  8. Cynthia Timmers
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  9. Jana Opavska
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  10. Alain de Bruin
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  11. Jean-Leon Chong
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  12. Prashant Trikha
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  13. Soledad A. Fernandez
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  14. Paul Stromberg
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  15. Thomas J. Rosol
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  16. Gustavo Leone
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Corresponding author

Correspondence toGustavo Leone.

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Tsai, SY., Opavsky, R., Sharma, N. et al. Mouse development with a single E2F activator.Nature 454, 1137–1141 (2008). https://doi.org/10.1038/nature07066

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Editorial Summary

E2F proteins: reasons for diversity

The E2F family is a family of proteins, some of which act as transcription activators and others as repressors. Here Shih-Yin Tsai et al. tested why there is such genetic complexity by inactivating the entire subset of activators singly or in combination in mice. They show that E2f3a is sufficient to support mouse embryonic and postnatal development. However, expression of E2f3b or E2f1 from the E2f3a locus suppressed all the postnatal phenotypes associated with the inactivation of E2f3a. They conclude there is functional redundancy among activators and that the requirement for E2f3a during postnatal development is dictated by its regulatory sequences, not by its protein function. These findings provide a molecular basis for the observed specificity among E2F activators during development.