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Plant Cell, Vol. 12, 1927-1938, October 2000, Copyright © 2000, American Society of Plant Physiologists

The Pea light-independent photomorphogenesis1 Mutant Results from Partial Duplication of COP1 Generating an Internal Promoter and Producing Two Distinct Transcripts

James A. Sullivana and John C. Graya
a Department of Plant Sciences and Cambridge Centre for Molecular Recognition, University of Cambridge, Downing Street, Cambridge, CB2 3EA, United Kingdom

Correspondence to: John C. Gray, jcg2{at}mole.bio.cam.ac.uk (E-mail), 44-1223-333953 (fax)

The pea lip1 (light-independent photomorphogenesis1) mutant shows many of the characteristics of light-grown development when grown in continuous darkness. To investigate the identity of LIP1, cDNAs encoding the pea homolog of COP1, a repressor of photomorphogenesis identified in Arabidopsis, were isolated from wild-type and lip1 pea seedlings. lip1 seedlings contained a wild-type COP1 transcript as well as a larger COP1' transcript that contained an internal in-frame duplication of 894 bp. The COP1' transcript segregated with the lip1 phenotype in F2 seedlings and could be translated in vitro to produce a protein of ~100 kD. The COP1 gene in lip1 peas contained a 7.5-kb duplication, consisting of exons 1 to 7 of the wild-type sequence, located 2.5 kb upstream of a region of genomic DNA identical to the wild-type COP1 DNA sequence. Transcription and splicing of the mutant COP1 gene was predicted to produce the COP1' transcript, whereas transcription from an internal promoter in the 2.5-kb region of DNA located between the duplicated regions of COP1 would produce the wild-type COP1 transcript. The presence of small quantities of wild-type COP1 transcripts may reduce the severity of the phenotype produced by the mutated COP1' protein. The genomic DNA sequences of the COP1 gene from wild-type and lip1 peas and the cDNA sequences of COP1 and COP1' transcripts have been submitted to the EMBL database under the EMBL accession numbers AJ276591, AJ276592, AJ289773, and AJ289774, respectively.




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