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Genotoxic stress causes the accumulation of DNA‐dependent protein kinase catalytic subunit phosphorylated at serine 2056 at nuclear speckles and alters pre‐mRNA alternative splicing

RNA splicing has emerged as a critical player in the DNA damage response (DDR). However, the underlying mechanism(s) by which pre‐mRNA splicing is coordinately regulated by genotoxic stress has remained largely unclear. Here, we show that a DDR factor, DNA‐dependent protein kinase (DNA‐PK), particip...

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Autores principales: Liu, Shuang, Shao, Yuan, Wang, Qi, Zhai, Yonggong, Li, Xialu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6356181/
https://www.ncbi.nlm.nih.gov/pubmed/30761255
http://dx.doi.org/10.1002/2211-5463.12569
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author Liu, Shuang
Shao, Yuan
Wang, Qi
Zhai, Yonggong
Li, Xialu
author_facet Liu, Shuang
Shao, Yuan
Wang, Qi
Zhai, Yonggong
Li, Xialu
author_sort Liu, Shuang
collection PubMed
description RNA splicing has emerged as a critical player in the DNA damage response (DDR). However, the underlying mechanism(s) by which pre‐mRNA splicing is coordinately regulated by genotoxic stress has remained largely unclear. Here, we show that a DDR factor, DNA‐dependent protein kinase (DNA‐PK), participates in the modulation of pre‐mRNA splicing in the presence of DNA double‐strand break (DSB)‐induced genotoxic stress. Through indirect immunostaining, we made the surprising discovery that DNA‐PK catalytic subunits (DNA‐PKcs) autophosphorylated at serine 2056 (S2056) accumulate at nuclear speckles (dynamic nuclear structures that are enriched with splicing factors), following their dissociation from DSB lesions. Inactivation of DNA‐PKcs, either using a small molecule inhibitor or by RNA interference, alters alternative splicing of a set of pre‐mRNAs in A549 cells treated with the topoisomerase II inhibitor mitoxantrone, indicative of an involvement of DNA‐PKcs in modulating pre‐mRNA splicing following genotoxic stress. These findings indicate a novel physical and functional connection between the DNA damage response and pre‐mRNA splicing, and enhance our understanding of how mRNA splicing is involved in the cellular response to DSB lesions.
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spelling pubmed-63561812019-02-13 Genotoxic stress causes the accumulation of DNA‐dependent protein kinase catalytic subunit phosphorylated at serine 2056 at nuclear speckles and alters pre‐mRNA alternative splicing Liu, Shuang Shao, Yuan Wang, Qi Zhai, Yonggong Li, Xialu FEBS Open Bio Research Articles RNA splicing has emerged as a critical player in the DNA damage response (DDR). However, the underlying mechanism(s) by which pre‐mRNA splicing is coordinately regulated by genotoxic stress has remained largely unclear. Here, we show that a DDR factor, DNA‐dependent protein kinase (DNA‐PK), participates in the modulation of pre‐mRNA splicing in the presence of DNA double‐strand break (DSB)‐induced genotoxic stress. Through indirect immunostaining, we made the surprising discovery that DNA‐PK catalytic subunits (DNA‐PKcs) autophosphorylated at serine 2056 (S2056) accumulate at nuclear speckles (dynamic nuclear structures that are enriched with splicing factors), following their dissociation from DSB lesions. Inactivation of DNA‐PKcs, either using a small molecule inhibitor or by RNA interference, alters alternative splicing of a set of pre‐mRNAs in A549 cells treated with the topoisomerase II inhibitor mitoxantrone, indicative of an involvement of DNA‐PKcs in modulating pre‐mRNA splicing following genotoxic stress. These findings indicate a novel physical and functional connection between the DNA damage response and pre‐mRNA splicing, and enhance our understanding of how mRNA splicing is involved in the cellular response to DSB lesions. John Wiley and Sons Inc. 2018-12-28 /pmc/articles/PMC6356181/ /pubmed/30761255 http://dx.doi.org/10.1002/2211-5463.12569 Text en © 2018 The Authors. Published by FEBS Press and John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Liu, Shuang
Shao, Yuan
Wang, Qi
Zhai, Yonggong
Li, Xialu
Genotoxic stress causes the accumulation of DNA‐dependent protein kinase catalytic subunit phosphorylated at serine 2056 at nuclear speckles and alters pre‐mRNA alternative splicing
title Genotoxic stress causes the accumulation of DNA‐dependent protein kinase catalytic subunit phosphorylated at serine 2056 at nuclear speckles and alters pre‐mRNA alternative splicing
title_full Genotoxic stress causes the accumulation of DNA‐dependent protein kinase catalytic subunit phosphorylated at serine 2056 at nuclear speckles and alters pre‐mRNA alternative splicing
title_fullStr Genotoxic stress causes the accumulation of DNA‐dependent protein kinase catalytic subunit phosphorylated at serine 2056 at nuclear speckles and alters pre‐mRNA alternative splicing
title_full_unstemmed Genotoxic stress causes the accumulation of DNA‐dependent protein kinase catalytic subunit phosphorylated at serine 2056 at nuclear speckles and alters pre‐mRNA alternative splicing
title_short Genotoxic stress causes the accumulation of DNA‐dependent protein kinase catalytic subunit phosphorylated at serine 2056 at nuclear speckles and alters pre‐mRNA alternative splicing
title_sort genotoxic stress causes the accumulation of dna‐dependent protein kinase catalytic subunit phosphorylated at serine 2056 at nuclear speckles and alters pre‐mrna alternative splicing
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6356181/
https://www.ncbi.nlm.nih.gov/pubmed/30761255
http://dx.doi.org/10.1002/2211-5463.12569
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