Abstract
53BP1 is a p53 binding protein of unknown function that binds to the central DNA-binding domain of p53. It relocates to the sites of DNA strand breaks in response to DNA damage and is a putative substrate of the ataxia telangiectasia-mutated (ATM) kinase. To study the biological role of 53BP1, we disrupted the 53BP1 gene in the mouse. We show that, similar to ATM(-/-) mice, 53BP1-deficient mice were growth retarded, immune deficient, radiation sensitive, and cancer prone. 53BP1(-/-) cells show a slight S-phase checkpoint defect and prolonged G(2)/M arrest after treatment with ionizing radiation. Moreover, 53BP1(-/-) cells feature a defective DNA damage response with impaired Chk2 activation. These data indicate that 53BP1 acts downstream of ATM and upstream of Chk2 in the DNA damage response pathway and is involved in tumor suppression.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Carrier Proteins / genetics
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Carrier Proteins / metabolism*
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Cell Cycle / physiology
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Chromosomal Proteins, Non-Histone
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DNA Damage* / physiology
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DNA-Binding Proteins
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Gene Targeting
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Growth Disorders / complications
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Growth Disorders / genetics*
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Intracellular Signaling Peptides and Proteins*
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Lymphoma / complications
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Lymphoma / genetics*
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Lymphoma / pathology
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Mice
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Mice, Knockout
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Neoplastic Syndromes, Hereditary / complications
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Neoplastic Syndromes, Hereditary / genetics*
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Phenotype
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Phosphoproteins*
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Protein Binding / physiology
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Radiation Tolerance / genetics
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Tumor Suppressor Proteins / metabolism*
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Tumor Suppressor p53-Binding Protein 1
Substances
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Carrier Proteins
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Chromosomal Proteins, Non-Histone
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DNA-Binding Proteins
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Intracellular Signaling Peptides and Proteins
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Phosphoproteins
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Trp53bp1 protein, mouse
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Tumor Suppressor Proteins
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Tumor Suppressor p53-Binding Protein 1