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BRCTx is a novel, highly conserved RAD18-interacting protein
David J Adams1, Louise van der Weyden, Fanni V Gergely
1The Wellcome Trust Sanger Institute Hinxton, Cambs CB10 1SA, United Kingdom.
Molecular and Cellular Biology
|January 6, 2005
Summary
The novel gene Brctx, containing a BRCT domain, is not essential for DNA repair or cell cycle control in mice. Brctx-deficient mice show normal development, suggesting functional redundancy in these processes.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- The BRCA1 C-terminus (BRCT) domain is crucial for DNA damage response, DNA repair, and cell cycle regulation.
- A novel gene, Brctx, featuring a BRCT motif, has been identified and characterized.
Purpose of the Study:
- To clone, characterize, and perform targeted mutagenesis of the novel Brctx gene.
- To investigate the role of Brctx in DNA damage response, DNA repair, and cell cycle control.
Main Methods:
- Gene cloning and characterization of Brctx.
- Targeted mutagenesis to create Brctx-deficient mice.
- Yeast two-hybrid and immunoprecipitation assays to study protein interactions.
- Analysis of DNA damage sensitivity, cell growth, and cell cycle parameters in Brctx-deficient murine embryonic fibroblasts (MEFs) and thymocytes.
Main Results:
- Brctx is ubiquitously expressed, with highest levels in the testis.
- Brctx-deficient mice exhibit normal development, fertility, and lack pathological abnormalities.
- Brctx interacts with hRAD18 and localizes to the nucleus and centrosome.
- Brctx deficiency does not confer sensitivity to DNA-damaging agents in MEFs.
- Cell cycle parameters in thymocytes are indistinguishable between wild-type and Brctx knockout mice.
Conclusions:
- Brctx is not essential for DNA damage checkpoint regulation, DNA repair, or cell cycle control.
- The BRCT domain of Brctx mediates nuclear and centrosomal localization.
- Brctx may be functionally redundant in the investigated cellular processes.