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PLANT PHYSIOLOGY , Vol 115, Issue 4 1385-1395, Copyright © 1997 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Identification of Proliferation-Induced Genes in Arabidopsis thaliana (Characterization of a New Member of the Highly Evolutionarily Conserved Histone H2A.F/Z Variant Subfamily)
D. Callard and L. Mazzolini
Laboratoire de Biologie Moleculaire des Relations Plantes-Microorganismes, Unite Mixte de Recherche no. 215 du Centre National de la Recherche Scientifique et de l'Institut National de la Recherche Agronomique, F-31326 Castanet-Tolosan, France (D.C., L.M.)
The changes in gene expression associated with the reinitiation of cell
division and subsequent progression through the cell cycle in Arabidopsis
thaliana cell-suspension cultures were investigated. Partial
synchronization of cells was achieved by a technique combining phosphate
starvation and a transient treatment with the DNA replication inhibitor
aphidicolin. Six cDNAs corresponding to genes highly induced in
proliferating cells and showing cell-cycle-regulated expression were
obtained by the mRNA differential display technique. Full-length cDNA
clones (cH2BAt and cH2AvAt) corresponding to two of the display products
were subsequently isolated. The cH2BAt clone codes for a novel histone H2B
protein, whereas the cH2AvAt cDNA corresponds to a gene encoding a new
member of the highly conserved histone H2A.F/Z subfamily of chromosomal
proteins. Further studies indicated that H2AvAt mRNA expression is tightly
correlated with cell proliferation in cell-suspension cultures, and that
closely related analogs of the encoded protein exist in Arabidopsis. The
implications of the conservation of histone H2A.F/Z variants in plants are
discussed.
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