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Plant Cell Advance Online Publication
Published on January 17, 2003; 10.1105/tpc.006759

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Received July 30, 2002
Accepted November 6, 2002

Duplicated fie Genes in Maize: Expression Pattern and Imprinting Suggest Distinct Functions

Olga N. Danilevskaya 1*, Pedro Hermon 1, Sabine Hantke 1, Michael G. Muszynski 1, Krishna Kollipara 1, and Evgueni V. Ananiev 1

1 Pioneer Hi-Bred International, Inc., 7250 NW 62nd Avenue, Johnston, Iowa 50131

* To whom correspondence should be addressed. E-mail: olga.danilevskaya{at}pioneer.com.

Two maize genes with predicted translational similarity to the Arabidopsis FIE (Fertilization-Independent Endosperm) protein, a repressor of endosperm development in the absence of fertilization, were cloned and analyzed. Genomic sequences of fie1 and fie2 show significant homology within coding regions but none within introns or 5' upstream. The fie1 gene is expressed exclusively in the endosperm of developing kernels starting at ~6 days after pollination. fie1 is an imprinted gene showing no detectable expression of the paternally derived fie1 allele during kernel development. Conversely, fie2 is expressed in the embryo sac before pollination. After pollination, its expression persists, predominantly in the embryo and at lower levels in the endosperm. The paternal fie2 allele is not expressed early in kernel development, but its transcription is activated at 5 days after pollination. fie2 is likely to be a functional ortholog of the Arabidopsis FIE gene, whereas fie1 has evolved a distinct function. The maize FIE2 and sorghum FIE proteins form a monophyletic group, sharing a closer relationship to each other than to the FIE1 protein, suggesting that maize fie genes originated from two different ancestral genomes.




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