NDLI: The mop1 (mediator of paramutation1) Mutant Progressively Reactivates One of the Two Genes Encoded by the MuDR Transposon in Maize

Content Provider	PubMed Central
Author	Woodhouse, Margaret Roth Freeling, Michael Lisch, Damon
Copyright Year	2006
Abstract	Transposons make up a sizable portion of most genomes, and most organisms have evolved mechanisms to silence them. In maize, silencing of the Mutator family of transposons is associated with methylation of the terminal inverted repeats (TIRs) surrounding the autonomous element and loss of mudrA expression (the transposase) as well as mudrB (a gene involved in insertional activity). We have previously reported that a mutation that suppresses paramutation in maize, mop1, also hypomethylates Mu1 elements and restores somatic activity to silenced MuDR elements. Here, we describe the progressive reactivation of silenced mudrA after several generations in a mop1 background. In mop1 mutants, the TIRA becomes hypomethylated immediately, but mudrA expression and significant somatic reactivation is not observed until silenced MuDR has been exposed to mop1 for several generations. In subsequent generations, individuals that are heterozygous or wild type for the Mop1 allele continue to exhibit hypomethylation at Mu1 and mudrA TIRs as well as somatic activity and high levels of mudrA expression. Thus, mudrA silencing can be progressively and heritably reversed. Conversely, mudrB expression is never restored, its TIR remains methylated, and new insertions of Mu elements are not observed. These data suggest that mudrA and mudrB silencing may be maintained via distinct mechanisms.
Related Links	http://dx.doi.org/10.1534/genetics.105.051383
Ending Page	592
Page Count	14
Starting Page	579
File Format	PDF
ISSN	00166731
Journal	Genetics
Issue Number	1
Volume Number	172
Language	English
Publisher	Copyright © 2006 by the Genetics Society of America
Publisher Date	2005-10-01
Access Restriction	Open
Rights Holder	Copyright © 2006 by the Genetics Society of America
Subject Keyword	Genetics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics

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The mop1 (mediator of paramutation1) mutant progressively reactivates one of the two genes encoded by the MuDR transposon in maize

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The mop1 (mediator of paramutation1) Mutant Progressively Reactivates One of the Two Genes Encoded by the MuDR Transposon in Maize

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