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Molecular and Cellular Biology, October 1998, p. 6075-6082, Vol. 18, No. 10
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Biased Suppression of Hematopoiesis and Multiple Developmental Defects in Chimeric Mice Containing Shp-2 Mutant Cells

Cheng-Kui Qu,1,2,3 Wen-Mei Yu,1,2,3 Biagio Azzarelli,4 Scott Cooper,2,3,5 Hal E. Broxmeyer,2,3,5 and Gen-Sheng Feng1,2,3,*

Departments of Biochemistry and Molecular Biology,1 Pathology and Laboratory Medicine,4 and Microbiology and Immunology5 and Walther Oncology Center,2 Indiana University School of Medicine, Indianapolis, Indiana 46202-5254, and Walther Cancer Institute, Indianapolis, Indiana 462083

Received 12 May 1998/Returned for modification 16 June 1998/Accepted 16 July 1998

Shp-2 is a cytoplasmic tyrosine phosphatase that contains two Src homology 2 (SH2) domains at the N terminus. Biochemical data suggests that Shp-2 acts downstream of a variety of receptor and cytoplasmic tyrosine kinases. A targeted deletion mutation in the N-terminal SH2 (SH2-N) domain results in embryonic lethality of homozygous mutant mice at midgestation. In vitro embryonic stem (ES) cell differentiation assays suggest that Shp-2 might play an important role in hematopoiesis. By aggregating homozygous mutant (Shp-2-/-) ES cells and wild-type (WT) embryos, we created Shp-2-/--WT chimeric animals. We report here an essential role of Shp-2 in the control of blood cell development. Despite the widespread contribution of mutant cells to various tissues, no Shp-2-/- progenitors for erythroid or myeloid cells were detected in the fetal liver and bone marrow of chimeric animals by using the in vitro CFU assay. Furthermore, hematopoiesis was defective in Shp-2-/- yolk sacs. In addition, the Shp-2 mutation caused multiple developmental defects in chimeric mice, characterized by short hind legs, aberrant limb features, split lumbar vertebrae, abnormal rib patterning, and pathological changes in the lungs, intestines, and skin. These results demonstrate a functional involvement of Shp-2 in the differentiation of multiple tissue-specific cells and in body organization. More importantly, the requirement for Shp-2 is more stringent in hematopoiesis than in other systems.

* Corresponding author. Mailing address: Walther Oncology Center, Indiana University School of Medicine, 1044 W. Walnut St. Room 302, Indianapolis, IN 46202-5254. Phone: (317) 274-7515. Fax: (317) 274-7592. E-mail: gfeng{at}iupui.edu.

Molecular and Cellular Biology, October 1998, p. 6075-6082, Vol. 18, No. 10
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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