Triticum enhancer of zeste 1 (Tezl), a homolog of enhancer of zeste in Triticum monococcum Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ht24wm692

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  • The Polycomb group (PcG) of genes of Drosophila melanogaster Meigen are involved in developmental regulation through chromatin remodeling. Homologs of PcG genes have been identified in both plant and animal species. In this study, we detail the identification and characterization of Triticum enhancer of zeste 1 (Tez1), a homolog of the Drosophila PcG gene Enhancer of zeste [E(z)], from cultivated einkorn wheat (Triticum monococcum L.). Tez1 encoded a 2,670- nucleotide transcript for an 890-amino acid (99-kDa) predicted protein. The TEZ1 predicted protein contained protein-protein, DNA binding, nuclear localization, and histonemethyltransferase domains typically found in E(z) homologs. The transcript of Tez1 was found in both reproductive and vegetative tissues suggesting that it is involved in global biological processes. Using common wheat (Triticum aestivum L.) aneuploid stocks, two Tez1 homologous loci, Xorw9 (Tez1)-4A and Xorw10 (Tez1)-4D, were localized to chromosomes 4A and 4D. Linkage mapping showed that Xorw9 (Tez1)-4A was localized in the terminal end of the short arm of chromosome 4A. Chromosome deletion bin mapping showed that Xorw9 (Tezl)-4A (on bin 4AS-0.20-0.63) and Xorw10 (Tez1)-4D (on bin 4DL-0.31-0.56) were located in homoeologous regions on chromosomes 4A and 4D, respectively. Furthermore, comparative mapping suggested that the E(z) homologs Tez1 from wheat (T. aestivum), OsiEZ1 from rice (Oryza sativa L.), and Mez2 from maize (Zea mays L.) were orthologous genes. Phylogenetic analysis also indicated that TEZ1 of T. monococcum most closely resembled OsiEZl of rice followed by MEZ2 and MEZ3 of maize. TEZ1, OsiEZ1, MEZ2 and MEZ3 were more closely to SWINGER (SWN) of Arabidopsis thaliana (L.) Heynh. than to CURLY LEAF (CLF) or MEDEA (MEA).
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