DET1, a negative regulator of light-mediated development and gene expression in arabidopsis, encodes a novel nuclear-localized protein.
The mechanisms by which plants integrate light signals to modify endogenous developmental programs are largely unknown. One candidate for a signal transduction component that may integrate light with developmental pathways is the Arabidopsis DET1 gene product. Here we report the positional cloning of the DET1 locus and show that DET1 is a unique nuclear-localized protein. An analysis of a number of det1 mutants indicates that mutants with partial DET1 activity develop as light-grown plants in the dark. det1 null mutants share this phenotype, but also display severe defects in temporal and spatial regulation of gene expression. These results suggest that DET1 acts in the nucleus to control the cell type-specific expression of light-regulated promoters.
Plant Biology Laboratory, Salk Institute, San Diego, California 92186.
A
A
Pepper
T
T
Delaney
T
T
Washburn
D
D
Poole
J
J
Chory
D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development*; D029681:Arabidopsis Proteins; D002467:Cell Nucleus / Q000737:chemistry; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004252:DNA Mutational Analysis; D015870:Gene Expression; D047908:Intracellular Signaling Peptides and Proteins; D008027:Light; D008969:Molecular Sequence Data; D009154:Mutation / Q000502:physiology; D009687:Nuclear Proteins / Q000737:chemistry / Q000235:genetics*; D010641:Phenotype; D010937:Plant Growth Regulators; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis; D017422:Sequence Analysis, DNA; D015398:Signal Transduction / Q000235:genetics*
D029681:Arabidopsis Proteins; C088435:DET1 protein, Arabidopsis; D047908:Intracellular Signaling Peptides and Proteins; D009687:Nuclear Proteins; D010937:Plant Growth Regulators; D010940:Plant Proteins; D012333:RNA, Messenger