Abstract
The mouse Polycomb-group gene, embryonic ectoderm development (eed), appears to regulate cellular growth and differentiation in a developmental and tissue specific manner. During embryogenesis, eed regulates axial patterning, whereas in the adult eed represses proliferation of myeloid and B cell precursors. The present report demonstrates two novel functional activities of eed: alteration of thymocyte maturation and suppression of thymic lymphoma development. Mice that inherit the viable hypomorphic 17Rn51989SB eed allele sustain a partial developmental block at or before the CD4−CD8−CD44−CD25+ stage of thymocyte differentiation. Furthermore, mice that are homozygous or heterozygous for the hypomorphic eed allele have an increased incidence and decreased latency of N-methyl-N-nitrosourea-induced thymic lymphoma compared to wild-type littermates. These findings support the notion that Polycomb-group genes exert pleiotrophic effects dictated by developmental stage and cellular context.
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Acknowledgements
This work was supported in part by ACS grant RPG-93-002-04-CN, NIEHS Center Grant ES07784, M.D. Anderson Core Grant CA16672, and a Bruce McMillan, Jr., Fdn. grant to ER Richie; NHGRI grant HG00370 and The Department of Energy BER Program under contract DE-AC 05-96OR22464 with Lockheed Martin Energy Research Corp. to EM Rinchik; and HD24462 to T Magnuson. The authors are grateful to Dr Lezlee Coghlan and Dale Weiss for maintenance of the animal colony at SPRD. We also thank Dr John Repass for PCR analysis, Dr Dennis Johnston for performing the statistical analyses and Carrie McKinley for assistance with manuscript preparation.
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Richie, E., Schumacher, A., Angel, J. et al. The Polycomb-group gene eed regulates thymocyte differentiation and suppresses the development of carcinogen-induced T-cell lymphomas. Oncogene 21, 299–306 (2002). https://doi.org/10.1038/sj.onc.1205051
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DOI: https://doi.org/10.1038/sj.onc.1205051
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