High-frequency developmental abnormalities in p53-deficient mice

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High-frequency developmental abnormalities in p53-deficient mice

BACKGROUND Several strains of mice carrying null mutations of the tumour suppressor gene p53 have been developed. It has been reported that homozygous mice from all of these strains develop normally to birth, but then succumb rapidly to neoplasia. RESULTS Here, we report that a significant proportion of female p53-/- mice die during embryogenesis or in the period between birth and weaning, be...

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Behavioral Abnormalities Observed in Zfhx2-Deficient Mice

Zfhx2 (also known as zfh-5) encodes a transcription factor containing three homeobox domains and 18 Zn-finger motifs. We have reported that Zfhx2 mRNA is expressed mainly in differentiating neurons in the mouse brain and its expression level is negatively regulated by the antisense transcripts of Zfhx2. Although the expression profile of Zfhx2 suggests that ZFHX2 might have a role in a particul...

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Spontaneous and ionizing radiation-induced chromosomal abnormalities in p53-deficient mice.

Chromosomal abnormalities have been assessed in p53-deficient mice. The in vivo frequency of spontaneous stable aberrations in bone marrow cells was elevated by approximately 20-fold in p53 nulls and 13-fold in p53 heterozygotes compared to wild-type. No excessive induction of stable aberrations by gamma-irradiation was observed, but p53 deficiency resulted in excess radiation-induced hyperploi...

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Bax accelerates tumorigenesis in p53-deficient mice.

Bax is a Bcl-2 family member that promotes apoptosis and counters the protective effect of Bcl-2. Bax is a downstream effector of p53-induced apoptosis and is transcriptionally regulated by p53. Moreover, the introduction of Bax deficiency accelerates the onset of tumors in transgenic mice expressing truncated large T antigen. These results implicate Bax as a tumor suppressor. Consequently, we ...

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Developmental defects and p53 hyperacetylation in Sir2 homolog (SIRT1)-deficient mice.

SIRT1 is a mammalian homolog of the Saccharomyces cerevisiae chromatin silencing factor Sir2. Dominant-negative and overexpression studies have implicated a role for SIRT1 in deacetylating the p53 tumor suppressor protein to dampen apoptotic and cellular senescence pathways. To elucidate SIRT1 function in normal cells, we used gene-targeted mutation to generate mice that express either a mutant...

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ژورنال

عنوان ژورنال: Current Biology

سال: 1995

ISSN: 0960-9822

DOI: 10.1016/s0960-9822(95)00183-7