Loss of full-length hnRNP R isoform impairs DNA damage response in motoneurons by inhibiting Yb1 recruitment to chromatin
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Neurons critically rely on the functions of RNA-binding proteins to maintain their polarity and resistance to neurotoxic stress. HnRNP R has a diverse range of post-transcriptional regulatory functions and is important for neuronal development by regulating axon growth. Hnrnpr pre-mRNA undergoes alternative splicing giving rise to a full-length protein and a shorter isoform lacking its N-terminal acidic domain. To investigate functions selectively associated with the full-length hnRNP R isoform, we generated a Hnrnpr knockout mouse (Hnrnpr(tm1a/tm1a)) in which expression of full-length hnRNP R was abolished while production of the truncated hnRNP R isoform was retained. Motoneurons cultured from Hnrnpr(tm1a/tm1a) mice did not show any axonal growth defects but exhibited enhanced accumulation of double-strand breaks and an impaired DNA damage response upon exposure to genotoxic agents. Proteomic analysis of the hnRNP R interactome revealed the multifunctional protein Yb1 as a top interactor. Yb1-depleted motoneurons were defective in DNA damage repair. We show that Yb1 is recruited to chromatin upon DNA damage where it interacts with gamma-H2AX, a mechanism that is dependent on full-length hnRNP R. Our findings thus suggest a novel role of hnRNP R in maintaining genomic integrity and highlight the function of its N-terminal acidic domain in this context.
Original language | English |
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Book series | Nucleic Acids Symposium Series |
Volume | 49 |
Issue number | 21 |
Pages (from-to) | 12284-12305 |
Number of pages | 22 |
ISSN | 0305-1048 |
DOIs | |
Publication status | Published - 2021 |
- NUCLEAR RIBONUCLEOPROTEIN-R, DETERMINING GENE-PRODUCT, ACTIN MESSENGER-RNA, COMET ASSAY, GENOME-WIDE, SPINAL-CORD, YB-1, SMN, INTERACTS, ENRICHMENT
Research areas
ID: 288925690