MMTV does not encode viral microRNAs but alters the levels of cancer-associated host microRNAs.

Abstract:

:Mouse mammary tumor virus (MMTV) induces breast cancer in mice in the absence of known virally-encoded oncogenes. Tumorigenesis by MMTV is thought to occur primarily through insertional mutagenesis, leading to the activation of cellular proto-oncogenes and outgrowth of selected cells. Here we investigated whether MMTV encodes microRNAs (miRNAs) and/or modulates host miRNAs that could contribute to tumorigenesis. High throughput small RNA sequencing analysis of MMTV-infected cells and MMTV-induced mammary tumors demonstrates that MMTV does not encode miRNAs. However, infected tissues have altered levels of several host miRNAs, including increased expression of members of the oncogenic miRNA cluster, miR-17-92. Notably, similar changes in miRNA levels have been previously reported in human breast cancers. Combined, our results demonstrate that virally encoded miRNAs do not contribute to MMTV-mediated tumorigenesis, but that changes in specific host miRNAs in infected cells may contribute to virus replication and tumor biology.

journal_name

Virology

journal_title

Virology

authors

Kincaid RP,Panicker NG,Lozano MM,Sullivan CS,Dudley JP,Mustafa F

doi

10.1016/j.virol.2017.09.030

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

180-187

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(17)30342-2

journal_volume

513

pub_type

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