Plant Physiology Preview
Published on March 7, 2002; 10.1104/pp.010742
Received August 16, 2001
Returned for revision November 28, 2001
Accepted December 21, 2001
Sequence Relationships, Conserved Domains, and Expression
Patterns for Maize Homologs of the Polycomb Group Genes
E(z), esc, and
E(Pc)
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.)
* Corresponding author; email: smkaeppl{at}facstaff.wisc.edu.
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.
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