Document Detail

Function of the DEMETER DNA glycosylase in the Arabidopsis thaliana male gametophyte.
MedLine Citation:
PMID:  21518889     Owner:  NLM     Status:  MEDLINE    
In double fertilization, the vegetative cell of the male gametophyte (pollen) germinates and forms a pollen tube that brings to the female gametophyte two sperm cells that fertilize the egg and central cell to form the embryo and endosperm, respectively. The 5-methylcytosine DNA glycosylase DEMETER (DME), expressed in the central cell, is required for maternal allele demethylation and gene imprinting in the endosperm. By contrast, little is known about the function of DME in the male gametophyte. Here we show that reduced transmission of the paternal mutant dme allele in certain ecotypes reflects, at least in part, defective pollen germination. DME RNA is detected in pollen, but not in isolated sperm cells, suggesting that DME is expressed in the vegetative cell. Bisulfite sequencing experiments show that imprinted genes (MEA and FWA) and a repetitive element (Mu1a) are hypomethylated in the vegetative cell genome compared with the sperm genome, which is a process that requires DME. Moreover, we show that MEA and FWA RNA are detectable in pollen, but not in isolated sperm cells, suggesting that their expression occurs primarily in the vegetative cell. These results suggest that DME is active and demethylates similar genes and transposons in the genomes of the vegetative and central cells in the male and female gametophytes, respectively. Although the genome of the vegetative cell does not participate in double fertilization, its DME-mediated demethylation is important for male fertility and may contribute to the reconfiguration of the methylation landscape that occurs in the vegetative cell genome.
Vera K Schoft; Nina Chumak; Yeonhee Choi; Mike Hannon; Marcelina Garcia-Aguilar; Adriana Machlicova; Lucyna Slusarz; Magdalena Mosiolek; Jin-Sup Park; Guen Tae Park; Robert L Fischer; Hisashi Tamaru
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2011-04-25
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  108     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-05-11     Completed Date:  2011-07-15     Revised Date:  2014-06-06    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  8042-7     Citation Subset:  IM    
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MeSH Terms
Arabidopsis / genetics,  metabolism*
Arabidopsis Proteins / genetics,  metabolism*
Base Sequence
DNA Methylation
DNA, Plant / genetics,  metabolism
Gene Expression Regulation, Plant
Genes, Plant
Genomic Imprinting
Germination / genetics,  physiology
N-Glycosyl Hydrolases / genetics,  metabolism*
Ovule / genetics,  metabolism
Pollen / genetics,  metabolism
Trans-Activators / genetics,  metabolism*
Grant Support
P21389-B03//PHS HHS; R01 GM069415/GM/NIGMS NIH HHS; R01-GM069415/GM/NIGMS NIH HHS
Reg. No./Substance:
0/Arabidopsis Proteins; 0/DNA, Plant; 0/Trans-Activators; EC 3.2.2.-/DEMETER protein, Arabidopsis; EC 3.2.2.-/N-Glycosyl Hydrolases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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