期刊
CELL DEATH AND DIFFERENTIATION
卷 16, 期 8, 页码 1108-1117出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/cdd.2009.25
关键词
limb development; p63; p63 C-terminal isoforms; skin
资金
- National Cancer Institute
- Carol Baldwin Breast Cancer Award
- Deutsche Krebshilfe
- Deutsche Forschungsgemeinschaft
p63, an ancestral transcription factor of the p53 family, has three C-terminal isoforms whose relative in vivo functions are elusive. The p63 gene is essential for skin and limb development, as vividly shown by two independent global knockout mouse models. Both strains, although constructed differently, have identical and severe phenotypes, characterized by absent epidermis and hindlimbs and only rudimentary forelimbs at birth. Here we show that mice from one model, Brdm2, express normal levels of truncated p63 proteins that contain the DNA binding and oligomerization domain but lack the long carboxy-terminal SAM (sterile alpha-motif) and post-SAM domains that are specific for the alpha and beta isoforms. As such, transcriptionally active p63 proteins from Brdm2 mice resemble the naturally occurring p63 gamma isoforms, which of all the p63 isoforms most closely resemble p53. Thus, Brdm2 mice are p63 alpha/beta isoform-specific knockout mice, gaining unexpected new importance. Our studies identify that p63 alpha/beta but not p63 gamma are absolutely required for proper skin and limb development. Cell Death and Differentiation (2009) 16, 1108-1117; doi:10.1038/cdd.2009.25; published online 20 March 2009
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