Fig. 6. Clustering analysis of light-regulated transcription factor genes. (A) An overview of the hierarchical cluster display for those transcription factor genes in our microarray regulated by light and COP1. Only those genes that exhibited twofold or more differential change in at least one sample pair of the four light intensity pairs tested were included for comparison. There are 53 genes included in the cluster (see supplementary data at http://dev.biologists.org/supplemental/ or http://plantgenomics.biology.yale.edu/ for detail). The gray color indicates that high quality data was not available. The lanes are as follows: 1, WT/1.5 µmol/m²/second WL vs. WT/D; 2, WT/15 µmol/m²/second WL vs. WT/D; 3, WT/150 µmol/m²/second WL vs. WT/D; 4 WT/2500 µmol/m²/second WL vs. WT/D. (B) The expression profiles of 5 representative genes from wild-type seedlings grown at four different light intensities and dark-grown cop1 alleles. The four lanes in the left panels of B are the same as in A, for the four light intensities used. The four lanes in the right panels of B are different cop1 alleles with increasing severity. Lane 1, dark-grown N282 and wild-type seedlings; lane 2, dark-grown cop1-6 and wild-type seedlings; lane 3, dark-grown cop1-1 and wild-type seedlings; lane 4, dark-grown cop1-5 and wild-type seedlings.

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