First published online March 7, 2002; 10.1104/pp.010742
Plant Physiol, April 2002, Vol. 128, pp. 1332-1345
Sequence Relationships, Conserved Domains, and Expression
Patterns for Maize Homologs of the Polycomb Group Genes
E(z), esc, and
E(Pc)1
Nathan M.
Springer,
Olga N.
Danilevskaya,
Pedro
Hermon,
Tim G.
Helentjaris,
Ronald L.
Phillips,
Heidi F.
Kaeppler, and
Shawn M.
Kaeppler*
Department of Agronomy, University of Wisconsin, Madison, Wisconsin
53706 (N.M.S., H.F.K., S.M.K.); Pioneer Hi-Bred International,
Johnston, Iowa 50131 (O.N.D., P.H., T.G.H.); and Department of
Agronomy, University of Minnesota, St. Paul, Minnesota 55108 (R.L.P.)
Polycomb group (PcG) proteins play an important role in
developmental and epigenetic regulation of gene expression in fruit fly
(Drosophila melanogaster) and
mammals. Recent evidence has shown that Arabidopsis homologs of PcG
proteins are also important for the regulation of plant
development. The objective of this study was to characterize the PcG
homologs in maize (Zea mays). The 11 cloned PcG proteins
from fruit fly and the Enhancer of zeste
[E(z)], extra sex combs
(esc), and Enhancer of Polycomb [E(Pc)] homologs from Arabidopsis were used as queries
to perform TBLASTN searches against the public maize expressed sequence
tag database and the Pioneer Hi-Bred database. Maize homologs were found for E(z), esc, and E(Pc), but not
for Polycomb, pleiohomeotic, Posterior sex combs, Polycomblike,
Additional sex combs, Sex combs on
midleg, polyhometoic, or multi sex
combs. Transcripts of the three maize Enhancer of
zeste-like genes, Mez1, Mez2, and
Mez3, were detected in all tissues tested, and the
Mez2 transcript is alternatively spliced in a
tissue-dependent pattern. Zea mays fertilization independent
endosperm1 (ZmFie1) expression was limited to
developing embryos and endosperms, whereas ZmFie2
expression was found throughout plant development. The conservation of
E(z) and esc homologs across kingdoms
indicates that these genes likely play a conserved role in repressing
gene expression.
1
This research was supported by the U.S.
Department of Agriculture (National Needs Fellowship no.
98-38420-5832) and by the National Science Foundation (grant no. 9975930).
*
Corresponding author; e-mail smkaeppl{at}facstaff.wisc.edu; fax
608-262-5217.
© 2002 American Society of Plant Physiologists
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