A role of human RNase P subunits, Rpp29 and Rpp21, in homology directed-repair of double-strand breaks

Enas R. Abu-Zhayia, Hanan Khoury-Haddad, Noga Guttmann-Raviv, Raphael Serruya, Nayef Jarrous*, Nabieh Ayoub

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

DNA damage response (DDR) is needed to repair damaged DNA for genomic integrity preservation. Defective DDR causes accumulation of deleterious mutations and DNA lesions that can lead to genomic instabilities and carcinogenesis. Identifying new players in the DDR, therefore, is essential to advance the understanding of the molecular mechanisms by which cells keep their genetic material intact. Here, we show that the core protein subunits Rpp29 and Rpp21 of human RNase P complex are implicated in DDR. We demonstrate that Rpp29 and Rpp21 depletion impairs double-strand break (DSB) repair by homology-directed repair (HDR), but has no deleterious effect on the integrity of non-homologous end joining. We also demonstrate that Rpp29 and Rpp21, but not Rpp14, Rpp25 and Rpp38, are rapidly and transiently recruited to laser-microirradiated sites. Rpp29 and Rpp21 bind poly ADP-ribose moieties and are recruited to DNA damage sites in a PARP1-dependent manner. Remarkably, depletion of the catalytic H1 RNA subunit diminishes their recruitment to laser-microirradiated regions. Moreover, RNase P activity is augmented after DNA damage in a PARP1-dependent manner. Altogether, our results describe a previously unrecognized function of the RNase P subunits, Rpp29 and Rpp21, in fine-tuning HDR of DSBs.

Original languageAmerican English
Article number1002
JournalScientific Reports
Volume7
Issue number1
DOIs
StatePublished - 1 Dec 2017

Bibliographical note

Publisher Copyright:
© 2017 The Author(s).

Fingerprint

Dive into the research topics of 'A role of human RNase P subunits, Rpp29 and Rpp21, in homology directed-repair of double-strand breaks'. Together they form a unique fingerprint.

Cite this