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THE PLANT CELL, Vol 8, Issue 11 1951-1959, Copyright © 1996 by American Society of Plant Biologists
det1, cop1, and cop9 Mutations Cause Inappropriate Expression of Several Gene Sets
R. Mayer, D. Raventos and N. H. Chua
Laboratory of Plant Molecular Biology, The Rockefeller University, 1230 York Avenue, New York, New York 10021-6399
Genetic studies using Arabidopsis offer a promising approach to investigate
the mechanisms of light signal transduction during seedling development.
Several mutants, called det/cop, have been isolated based on their
deetiolated/constitutive photomorphogenic phenotypes in the dark. This
study examines the specificity of the det/cop mutations with respect to
their effects on genes regulated by other signal transduction pathways.
Steady state mRNA levels of a number of differently regulated gene sets
were compared between mutants and the wild type. We found that det2, cop2,
cop3, and cop4 mutants displayed a gene expression pattern similar to that
of the wild type. By contrast, det1, cop1, and cop9 mutations exhibited
pleiotropic effects. In addition to light-responsive genes, genes normally
inducible by plant pathogens, hypoxia, and developmental programs were
inappropriately expressed in these mutants. Our data provide evidence that
DET1, COP1, and COP9 most likely act as negative regulators of several sets
of genes, not just those involved in light-regulated seedling development.
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