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Molecular bases for the constitutive photomorphogenic phenotypes in Arabidopsis

View ORCID ProfileVinh Ngoc Pham, View ORCID ProfileXiaosa Xu, View ORCID ProfileEnamul Huq
doi: https://doi.org/10.1101/388157
Vinh Ngoc Pham
Department of Molecular Biosciences and The Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX 78712
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  • ORCID record for Vinh Ngoc Pham
Xiaosa Xu
Department of Molecular Biosciences and The Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX 78712
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Enamul Huq
Department of Molecular Biosciences and The Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX 78712
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Summary statement

Strikingly similar morphological and gene expression phenotypes among cop1, spaQ and pifQ mutants suggest that the cop phenotype of the cop1 and spaQ mutants might be due in part to a reduced level of PIFs

Abstract The transition from skotomorphogenesis to photomorphogenesis is regulated in part by COP1/SPA complex and PIFs in Arabidopsis. The constitutive photomorphogenic (cop) phenotypes of the cop1 and spaQ mutants were shown to be due to a high abundance of the positively acting transcription factors. Here we show that the four major PIF proteins are unstable in cop1 mutant, and an overexpression of P1F1, P1F3, P1F4 and P1F5 suppresses the cop1 phenotypes in the dark. A comparison of the transcriptome data among cop1, spaQ and pifQ reveals remarkably overlapping gene expression profiles with a preferential regulation of the PIF direct target genes. Additionally, HFR1 strongly inhibits the in vivo binding and transcriptional activation activity of PIF1 in the dark. Taken together, these data suggest that the cop phenotypes of the cop1 and spaQ mutants might be due to a combination of the reduced level of PIFs, increased level of the positive factors (e.g., HY5/HFR1 and others), and the HFR1-mediated inhibition of PIF targeted gene expression in the dark.

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Posted August 09, 2018.
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Molecular bases for the constitutive photomorphogenic phenotypes in Arabidopsis
Vinh Ngoc Pham, Xiaosa Xu, Enamul Huq
bioRxiv 388157; doi: https://doi.org/10.1101/388157
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Molecular bases for the constitutive photomorphogenic phenotypes in Arabidopsis
Vinh Ngoc Pham, Xiaosa Xu, Enamul Huq
bioRxiv 388157; doi: https://doi.org/10.1101/388157

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