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doi:10.1534/genetics.104.037770
A more recent version of this article appeared on April 1, 2005.
REGULAR RESEARCH PAPERS |
The Evolution of the SEPALLATA subfamily of MADS-box genes: A pre-angiosperm origin with multiple duplications throughout angiosperm history
Laura M. Zahn 1, Hongzhi Kong 1, James H. Leebens-Mack 1, Sangtae Kim 2, Pamela S. Soltis 2, Lena L. Landherr 1, Douglas E. Soltis 2, Claude W. dePamphilis 1 and Hong Ma 1*
1 Pennsylvania State University
2 University of Florida
* To whom correspondence should be addressed. E-mail: hxm16{at}psu.edu.
Submitted on October 20, 2004
Revised on November 15, 2004
Accepted on 21 December 2004
Members of the SEPALLATA (SEP) MADS-box subfamily are required for specifying the "floral state" by contributing to floral organ and meristem identity. SEP genes have not been detected in gymnosperms and seem to have originated since the lineage leading to extant angiosperms diverged from extant gymnosperms. Therefore, both functional and evolutionary studies suggest they may have been critical for the origin of the flower. To gain insights into the evolution of SEP genes, we isolated nine genes from plants that occupy phylogenetically important positions. Phylogenetic analyses of SEP sequences show that several gene duplications occurred during the evolution of this subfamily providing potential opportunities for functional divergence. The first duplication occurred prior to the origin of the extant angiosperms, resulting in the AGL2/3/4 and AGL9 clades. Subsequent duplications occurred within these clades in the eudicots and monocots. The timing of the first SEP duplication approximately coincides with duplications in the DEFICIENS/GLOBOSA and AGAMOUS MADS-box subfamilies, which may have resulted from either a proposed genome-wide duplication in the ancestor of extant angiosperms or multiple independent duplication events. Regardless of the mechanism of gene duplication, these pairs of duplicate transcription factors provided new possibilities of genetic interactions that may have been important in the origin of the flower.
Key Words: MADS-box, SEPALLATA, evolution, gene duplication, phylogeny
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