Letter | Published:

The SH2 tyrosine phosphatase Shp2 is required for mammalian limb development

Nature Genetics volume 24, pages 420423 (2000) | Download Citation

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Abstract

The tyrosine phosphatase Shp2 is recruited into tyrosine-kinase signalling pathways through binding of its two amino-terminal SH2 domains to specific phosphotyrosine motifs, concurrent with its re-localization and stimulation of phosphatase activity1. Shp2 can potentiate signalling through the MAP-kinase pathway2,3,4,5,6 and is required during early mouse development for gastrulation4,7. Chimaeric analysis can identify, by study of phenotypically normal embryos, tissues that tolerate mutant cells (and therefore do not require the mutated gene) or lack mutant cells (and presumably require the mutated gene during their developmental history8). We therefore generated chimaeric mouse embryos to explore the cellular requirements for Shp2. This analysis revealed an obligatory role for Shp2 during outgrowth of the limb. Shp2 is specifically required in mesenchyme cells of the progress zone (PZ), directly beneath the distal ectoderm of the limb bud. Comparison of Ptpn11 (encoding Shp2)-mutant and Fgfr1 (encoding fibroblast growth factor receptor-1)-mutant chimaeric limbs indicated that in both cases mutant cells fail to contribute to the PZ of phenotypically normal chimaeras, leading to the hypothesis that a signal transduction pathway, initiated by Fgfr1 and acting through Shp2, is essential within PZ cells. Rather than integrating proliferative signals, Shp2 probably exerts its effects on limb development by influencing cell shape, movement or adhesion. Furthermore, the branchial arches, which also use Fgfs during bud outgrowth, similarly require Shp2. Thus, Shp2 regulates phosphotyrosine-signalling events during the complex ectodermal-mesenchymal interactions that regulate mammalian budding morphogenesis.

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Acknowledgements

We thank A. Cheng for BrdU injections; S. McMaster for animal husbandry; D. Duboule and R. Johnson for Hoxd13 and Lmx1b in situ probes, respectively; F. Gertler for the anti-Mena antibody; and G.R. Martin for critically reading the manuscript. Predoctoral support for T.M.S. was from the Medical Research Council of Canada. This work was supported by a grant from Bristol Myers-Squibb, a Terry Fox Programme grant from the National Cancer Institute of Canada and a Howard Hughes International Scholar award to T.P.

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Author notes

    • Tracy M. Saxton

    Present address: Department of Anatomy and Program in Developmental Biology, School of Medicine, University of California at San Francisco, San Francisco, California, USA.

Affiliations

  1. Programme in Molecular Biology and Cancer, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.

    • Tracy M. Saxton
    • , Doug Holmyard
    • , Sarang Kulkarni
    • , Ken Harpal
    •  & Tony Pawson
  2. Department of Molecular and Medical Genetics, University of Toronto, Toronto, Ontario, Canada.

    • Tracy M. Saxton
    • , Brian G. Ciruna
    • , Janet Rossant
    •  & Tony Pawson
  3. Programme in Development and Fetal Health, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.

    • Brian G. Ciruna
    •  & Janet Rossant

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Correspondence to Tracy M. Saxton or Tony Pawson.

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DOI

https://doi.org/10.1038/74279

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