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Published on: June 26, 2020
NUSAP1 influences the DNA damage response by controlling BRCA1 protein levels
Shweta Kotian1, Tapahsama Banerjee1, Ainsley Lockhart1
1Department of Biomedical Informatics; The Ohio State University Comprehensive Cancer Center; The Ohio State University; Columbus, OH USA.
Nuclear protein NUSAP1 is crucial for DNA repair and centrosome duplication, impacting genomic stability. Its depletion impairs homologous recombination repair and centrosome number control by affecting BRCA1 levels, suggesting a role in carcinogenesis.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- NUSAP1 (Nuclear protein,ciaux) is known for roles in cell division processes like mitotic spindle assembly and chromosome segregation.
- Genomic stability is maintained by critical pathways including double-strand DNA break repair and centrosome duplication.
- Defects in these pathways are linked to cancer development (tumorigenesis).
Purpose of the Study:
- To investigate previously unrecognized functions of NUSAP1 in DNA repair and centrosome duplication.
- To elucidate the relationship between NUSAP1 and the BRCA1 pathway.
- To understand NUSAP1's potential role in carcinogenesis.
Main Methods:
- Depletion of NUSAP1 in cellular models.
- Assays for double-strand DNA break repair (homologous recombination and single-strand annealing).
- Analysis of centrosome numbers and BRCA1 protein levels.
- Assessment of BRCA1 recruitment to DNA damage sites.
Main Results:
- NUSAP1 depletion suppressed homologous recombination and single-strand annealing DNA repair pathways.
- NUSAP1 is essential for maintaining normal centrosome numbers.
- NUSAP1 regulates BRCA1 protein levels and its recruitment to DNA damage foci.
- BRCA1 overexpression partially rescued NUSAP1 depletion phenotypes.
Conclusions:
- NUSAP1 has novel functions in DNA repair and centrosome duplication, linked to the BRCA1 pathway.
- NUSAP1 influences genomic stability through regulation of BRCA1.
- NUSAP1's role in these fundamental cellular processes suggests its involvement in carcinogenesis.
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