HnRNPA2 is a novel histone acetyltransferase that mediates mitochondrial stress-induced nuclear gene expression
| Autor: | Jeelan Basha, Tapas K. Kundu, Edison Mejia, Hiroshi Nakagawa, Manti Guha, Gordon Ruthel, Ji-Kang Fang, Narayan G. Avadhani, Eric F. Rappaport, Kip E. Guja, Miguel Garcia-Diaz, Andres J. Klein-Szanto, Brett A. Kaufman, Andres Klein Szanto, M. Rebecca Glineburg, F. Brad Johnson, Satish Srinivasan |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Regulation of gene expression Mitochondrial DNA biology Chemistry Correction Cell Biology Histone acetyltransferase Biochemistry Chromatin Cell biology Nuclear receptor coactivator 1 03 medical and health sciences 030104 developmental biology Histone PCAF Histone methyltransferase Genetics biology.protein Molecular Biology |
| Zdroj: | Cell Discovery |
| ISSN: | 2056-5968 |
| Popis: | Reduced mitochondrial DNA copy number, mitochondrial DNA mutations or disruption of electron transfer chain complexes induce mitochondria-to-nucleus retrograde signaling, which induces global change in nuclear gene expression ultimately contributing to various human pathologies including cancer. Recent studies suggest that these mitochondrial changes cause transcriptional reprogramming of nuclear genes although the mechanism of this cross talk remains unclear. Here, we provide evidence that mitochondria-to-nucleus retrograde signaling regulates chromatin acetylation and alters nuclear gene expression through the heterogeneous ribonucleoprotein A2 (hnRNAP2). These processes are reversed when mitochondrial DNA content is restored to near normal cell levels. We show that the mitochondrial stress-induced transcription coactivator hnRNAP2 acetylates Lys 8 of H4 through an intrinsic histone lysine acetyltransferase (KAT) activity with Arg 48 and Arg 50 of hnRNAP2 being essential for acetyl-CoA binding and acetyltransferase activity. H4K8 acetylation at the mitochondrial stress-responsive promoters by hnRNAP2 is essential for transcriptional activation. We found that the previously described mitochondria-to-nucleus retrograde signaling-mediated transformation of C2C12 cells caused an increased expression of genes involved in various oncogenic processes, which is retarded in hnRNAP2 silenced or hnRNAP2 KAT mutant cells. Taken together, these data show that altered gene expression by mitochondria-to-nucleus retrograde signaling involves a novel hnRNAP2-dependent epigenetic mechanism that may have a role in cancer and other pathologies. |
| Databáze: | OpenAIRE |
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