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A member of the Pyrin family, IFI16, is a novel BRCA1-associated protein involved in the p53-mediated apoptosis pathway

Abstract

We identified IFI16 as a BRCA1-associated protein involved in p53-mediated apoptosis. IFI16 contains the Pyrin/PAAD/DAPIN domain, commonly found in cell death-associated proteins. BRCA1 (aa 502–802) interacted with the IFI16 Pyrin domain (aa 1–130). We found that IFI16 was localized in the nucleoplasm and nucleoli. Clear nucleolar IFI16 localization was not observed in HCC1937 BRCA1 mutant cells, but reintroduction of wild-type BRCA1 restored IFI16 nuclear relocalization following IR (ionizing radiation). Coexpression of IFI16 and BRCA1 enhanced DNA damage-induced apoptosis in mouse embryonic fibroblasts from BRCA1 mutant mice expressing wild-type p53, although mutant IFI16 deficient in binding to BRCA1 did not induce apoptosis. Furthermore, tetracycline-induced IFI16 collaborated in inducing apoptosis when adenovirus p53 was expressed in DNA-damaged p53-deficient EJ cells. These results indicate a BRCA1-IFI16 role in p53-mediated transmission of DNA damage signals and apoptosis.

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Abbreviations

BASC:

BRCA1-associated genome surveillance complex

MEF:

mouse embryonic fibroblast

HEK293:

human embryonic kidney 293

IR:

ionizing radiation

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Acknowledgements

We are grateful to Drs David M Livingston and George R Stark for helpful discussion, Ralph Scully for HCC1937-BRCA1 cells, Mutsuko Ouchi for generating and characterizing anti-BRCA1 monoclonal antibodies, Dr Scott Henderson, Jane Sue and Bryan Kloos for confocal laser microscope analysis, and the Mount Sinai School of Medicine Core Facilities for the monoclonal antibody, DNA sequencing and microscopic analysis. This work was supported by an NIH Predoctoral Training Award (JAA), the New York City Council Speaker's Fund (TO), an EMPIRE Grant of State of New York (TO) and National Cancer Institute Awards CA80058, CA78356 (SWL), CA84199 (JQ) and CA79892 and CA90631 (TO).

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Correspondence to Toru Ouchi.

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Aglipay, J., Lee, S., Okada, S. et al. A member of the Pyrin family, IFI16, is a novel BRCA1-associated protein involved in the p53-mediated apoptosis pathway. Oncogene 22, 8931–8938 (2003). https://doi.org/10.1038/sj.onc.1207057

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