Xenopus Furry Contributes to Release of MicroRNA Gene Silencing

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2010 Oct 27

PMID 20974966

Citations 9

Authors

Toshiyasu Goto

Akimasa Fukui

Hiroshi Shibuya

Ray Keller

Makoto Asashima

Affiliations

Soon will be listed here.

Abstract

A transcriptional corepressor, Xenopus furry (Xfurry), is expressed in the chordamesodermal region and induces secondary dorsal axes when overexpressed on the ventral side of the embryo. The N-terminal furry domain functions as a repressor, and the C-terminal leucine zipper (LZ) motifs /coiled-coil structure, found only in vertebrate homologs, contributes to the nuclear localization. The engrailed repressor (enR)+LZ repressor construct, which has properties similar to Xfurry, induced several chordamesodermal genes. In contrast, an antisense morpholino oligonucleotide, Xfurry-MO, and the activating construct, herpes simplex virus protein (VP16)+LZ, had effects opposite those of Xfurry overexpression. Because blocking protein synthesis with cycloheximide superinduced several Xfurry transcriptional targets, and because expression of enR+LZ induced such genes under cycloheximide treatment, we analyzed the role of an Xfurry transcriptional target, microRNA miR-15. Cycloheximide reduced the expression of primary miR-15 (pri-miR-15), whereas miR-15 reduced the expression of genes superinduced by cycloheximide treatment. These results show that Xfurry regulates chordamesodermal genes by contributing to repression of pretranscriptional gene silencing by miR-15.

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