Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcriptome analysis of dark-grown cop1 and cop1BBX22-GFPox plants

ABSTRACT: The proper accumulation of BBX22 mediated by COP1 is crucial for plants to maintain better growth fitness when growing in the dark environment as well as responding to seasonal changes in day-length. The constitutive-photomorphogenic development of the cop1 mutant is enhanced in cop1BBX22-GFPox plants, which show a short hypocotyl, high anthocyanin accumulation and expression of light-responsive genes. Target genes responsible for the exaggerated light phenotype in cop1BBX22-GFPox plants were revealed by comparing transcriptomes among dark-grown wild-type, cop1 and cop1BBX22-GFPox plants. Expression of genes regulated by light and multiple hormones are altered in plants over-accumulating BBX22, implying a coordination role of BBX22 in light- and hormone-mediated seedling development. Three biological replicates for 4-day-old etiolated seedlings of wild type (Col-0) and two mutants (cop1-4 and cop1-4BBX22-GFPox).

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Chiung-Swey Chang

PROVIDER: E-GEOD-22983 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

COP1-mediated degradation of BBX22/LZF1 optimizes seedling development in Arabidopsis.

Chang Chiung-Swey Joanne CS Maloof Julin N JN Wu Shu-Hsing SH

Plant physiology 20110322 1

Light regulates multiple aspects of growth and development in plants. Transcriptomic changes govern the expression of signaling molecules with the perception of light. Also, the 26S proteasome regulates the accumulation of positive and negative regulators for optimal growth of Arabidopsis (Arabidopsis thaliana) in the dark, light, or light/dark cycles. BBX22, whose induction is both light regulated and HY5 dependent, is a positive regulator of deetiolation in Arabidopsis. We found that during sk ...[more]

PMID: 21427283

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Project description:The proto-oncogenes ETV1, ETV4, and ETV5 encode members of the E26 transformation-specific (ETS) transcription factor family, which includes the most frequently rearranged and overexpressed genes in prostate cancer. Despite being critical regulators of development, little is known about their post-translational regulation. Here we identify the ubiquitin ligase COnstitutive Photomorphogenic-1 (COP1, also called RFWD2) as a tumor suppressor that negatively regulates ETV1, ETV4, and ETV5. ETV1, which is the member mutated more frequently in prostate cancer, was degraded after being ubiquitinated by COP1. Truncated ETV1 encoded by prostate cancer translocation TMPRSS2:ETV1 lacks the critical COP1 binding motifs (degrons) and was 50-fold more stable than wild-type ETV1. Almost all patient translocations eliminate these ETV1 degrons, implying that translocations rendering ETV1 insensitive to COP1 confer a significant selective advantage to prostate epithelial cells. Indeed, COP1 deficiency in mouse prostate elevated ETV1 levels and produced increased cell proliferation, hyperplasia, and early prostate intraepithelial neoplasia. The combined loss of COP1 and PTEN enhanced the invasiveness of mouse prostate adenocarcinomas. Finally, relatively rare human prostate cancer samples showed hemizygous loss of the COP1 gene, loss of COP1 protein expression, and abnormally elevated ETV1 protein while lacking a translocation event. These findings identify COP1 as a bona fide tumor suppressor whose down-regulation promotes prostatic epithelial cell proliferation and tumorigenesis. LNCap prostate cancer cell line were treated with 5 different sets of siRNAs: (1) control siRNA; (2) COP1 (RFWD2) siRNA; (3) COP1 siRNA + ETV1 siRNA; (4) COP1 siRNA + c-JUN siRNA; (5) COP1 siRNA + ETV1 siRNA + c-JUN siRNA. The experiments were conducted in two batches; each batch has its own control siRNA group, so that the batch effect can be properly modelled. Each group has 4-6 replicates; there are 31 samples in total.

Dataset Information

Transcriptome analysis of dark-grown cop1 and cop1BBX22-GFPox plants

Publications

COP1-mediated degradation of BBX22/LZF1 optimizes seedling development in Arabidopsis.

Similar Datasets

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