Abstract:
:The Fanconi anemia pathway in coordination with homologous recombination is essential to repair interstrand crosslinks (ICLs) caused by cisplatin. TIP60 belongs to the MYST family of acetyltransferases and is involved in DNA repair and regulation of gene transcription. Although the physical interaction between the TIP60 and FANCD2 proteins has been identified that is critical for ICL repair, it is still elusive whether TIP60 regulates the expression of FA and HR genes. In this study, we found that the chemoresistant nasopharyngeal carcinoma cells, derived from chronic treatment of cisplatin, show elevated expression of TIP60. Furthermore, TIP60 binds to the promoters of FANCD2 and BRCA1 by using the chromatin immunoprecipitation experiments and promote the expression of FANCD2 and BRCA1. Importantly, the depletion of TIP60 significantly reduces sister chromatid exchange, a measurement of HR efficiency. The similar results were also shown in the FNACD2-, and BRCA1-deficient cells. Additionally, these TIP60-deficient cells encounter more frequent stalled forks, as well as more DNA double-strand breaks resulting from the collapse of stalled forks. Taken together, our results suggest that TIP60 promotes the expression of FA and HR genes that are important for ICL repair and the chemoresistant phenotype under chronic treatment with cisplatin.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Su WP,Ho YC,Wu CK,Hsu SH,Shiu JL,Huang JC,Chang SB,Chiu WT,Hung JJ,Liu TL,Wu WS,Wu PY,Su WC,Chang JY,Liaw Hdoi
10.1038/s41598-017-04223-5subject
Has Abstractpub_date
2017-06-20 00:00:00pages
3879issue
1issn
2045-2322pii
10.1038/s41598-017-04223-5journal_volume
7pub_type
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