A Small RNA Mediated Regulation of a Stress-activated Retrotransposon and the Tissue Specific Transposition During the Reproductive Period in Arabidopsis

Overview

Journal Front Plant Sci

Date 2015 Feb 25

PMID 25709612

Citations 28

Authors

Wataru Matsunaga

Naohiko Ohama

Noriaki Tanabe

Yukari Masuta

Seiji Masuda

Namiki Mitani

Kazuko Yamaguchi-Shinozaki

Jian F Ma

Atsushi Kato

Hidetaka Ito

Affiliations

Soon will be listed here.

Abstract

Transposable elements (TEs) are key elements that facilitate genome evolution of the host organism. A number of studies have assessed the functions of TEs, which change gene expression in the host genome. Activation of TEs is controlled by epigenetic modifications such as DNA methylation and histone modifications. Several recent studies have reported that TEs can also be activated by biotic or abiotic stress in some plants. We focused on a Ty1/copia retrotransposon, ONSEN, that is activated by heat stress (HS) in Arabidopsis. We found that transcriptional activation of ONSEN was regulated by a small interfering RNA (siRNA)-related pathway, and the activation could also be induced by oxidative stress. Mutants deficient in siRNA biogenesis that were exposed to HS at the initial stages of vegetative growth showed transgenerational transposition. The transposition was also detected in the progeny, which originated from tissue that had differentiated after exposure to the HS. The results indicated that in some undifferentiated cells, transpositional activity could be maintained quite long after exposure to the HS.

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