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Leukemia. 2019 Jun 10. doi: 10.1038/s41375-019-0498-5. [Epub ahead of print]

The effects of MicroRNA deregulation on pre-RNA processing network in multiple myeloma.

Author information

1
Jerome Lipper Multiple Myeloma Disease Center, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA.
2
Institute of Medical Research, Ilia State University, Tbilisi, Georgia.
3
The Jackson Laboratory for Genomic Medicine, Farmington, CT, USA.
4
Laboratory of Hematology, University Hospital, Nantes, France.
5
Peking University, School of Life Sciences, Beijing, China.
6
Genomics of Myeloma Laboratory, University Hospital, Toulouse, France.
7
Jerome Lipper Multiple Myeloma Disease Center, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA. Nikhil_munshi@dfci.harvard.edu.
8
Jerome Lipper Multiple Myeloma Disease Center, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA. Kenneth_anderson@dfci.harvard.edu.

Abstract

Over the last few years, a detailed map of genetic and epigenetic lesions that underlie multiple myeloma (MM) has been created. Regulation of microRNA (miR)-dependent gene expression and mRNA splicing play significant roles in MM pathogenesis; however, to date an interplay between these processes is not yet delineated. Here we investigated miR-mediated regulation of splicing networks at the transcriptome level. Our studies show that a significant number (78%) of miRs which are either up- or down-regulated in patient CD138+ MM cells, but not in healthy donors (HD) CD138+ plasma cells (PC), target genes involved in early stages of pre-mRNA splicing. We also identified deregulated miRs that target core splicing factors (SF) and modifiers (SM, enhancers/silencers) which cause altered splicing in MM. Our studies suggest that Let-7f, in combination other miRs which are frequently and significantly deregulated in patients with overt MM, targets genes that regulate intron excision. Importantly, deregulated expression of certain miRs in MM promote increased intron retention, a novel characteristic of the MM genome, by inducing deregulated expression of the genes that regulate the splicing network. Our studies, therefore, provide the rationale for therapeutically targeting deregulated miRs to reverse aberrant splicing and improve patient outcome in MM.

PMID:
31182781
DOI:
10.1038/s41375-019-0498-5

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