The architectural chromatin factor high mobility group A1 enhancesdna Ligase IV activity influencingdna repair

Ilenia Pellarin, Laura Arnoldo, Silvia Costantini, Silvia Pegoraro, Gloria Ros, Carlotta Penzo, Gianluca Triolo, Francesca Demarchi, Riccardo Sgarra, Alessandro Vindigni, Guidalberto Manfioletti

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6 Scopus citations

Abstract

The HMGA1 architectural transcription factor is an oncogene overexpressed in the vast majority of human cancers. HMGA1 is a highly connected node in the nuclear molecular network and the key aspect of HMGA1 involvement in cancer development is that HMGA1 simultaneously confers cells multiple oncogenic hits, ranging from global chromatin structural and gene expression modifications up to the direct functional alterations of key cellular proteins. Interestingly, HMGA1 also modulates DNA damage repair pathways. In this work, we provide evidences linking HMGA1 with Non-Homologous End Joining DNA repair. We show that HMGA1 is in complex with and is a substrate for DNA-PK. HMGA1 enhances Ligase IV activity and it counteracts the repressive histone H1 activity towards DNA ends ligation. Moreover, breast cancer cells overexpressing HMGA1 show a faster recovery upon induction of DNA double-strand breaks, which is associated with a higher survival. These data suggest that resistance to DNA-damaging agents in cancer cells could be partially attributed to HMGA1 overexpression thus highlighting the relevance of considering HMGA1 expression levels in the selection of valuable and effective pharmacological regimens.

Original languageEnglish
Article numbere0164258
JournalPloS one
Volume11
Issue number10
DOIs
StatePublished - Oct 2016

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    Pellarin, I., Arnoldo, L., Costantini, S., Pegoraro, S., Ros, G., Penzo, C., Triolo, G., Demarchi, F., Sgarra, R., Vindigni, A., & Manfioletti, G. (2016). The architectural chromatin factor high mobility group A1 enhancesdna Ligase IV activity influencingdna repair. PloS one, 11(10), [e0164258]. https://doi.org/10.1371/journal.pone.0164258