A long non-coding RNA targets microRNA miR-34a to regulate colon cancer stem cell asymmetric division.

Abstract:

:The roles of long non-coding RNAs (lncRNAs) in regulating cancer and stem cells are being increasingly appreciated. Its diverse mechanisms provide the regulatory network with a bigger repertoire to increase complexity. Here we report a novel LncRNA, Lnc34a, that is enriched in colon cancer stem cells (CCSCs) and initiates asymmetric division by directly targeting the microRNA miR-34a to cause its spatial imbalance. Lnc34a recruits Dnmt3a via PHB2 and HDAC1 to methylate and deacetylate the miR-34a promoter simultaneously, hence epigenetically silencing miR-34a expression independent of its upstream regulator, p53. Lnc34a levels affect CCSC self-renewal and colorectal cancer (CRC) growth in xenograft models. Lnc34a is upregulated in late-stage CRCs, contributing to epigenetic miR-34a silencing and CRC proliferation. The fact that lncRNA targets microRNA highlights the regulatory complexity of non-coding RNAs (ncRNAs), which occupy the bulk of the genome.

journal_name

Elife

journal_title

eLife

authors

Wang L,Bu P,Ai Y,Srinivasan T,Chen HJ,Xiang K,Lipkin SM,Shen X

doi

10.7554/eLife.14620

subject

Has Abstract

pub_date

2016-04-14 00:00:00

issn

2050-084X

journal_volume

5

pub_type

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