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CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the putative Drosophila ortholog of CLOCK INTERACTING PROTEIN CIRCADIAN

ABSTRACT: CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the putative Drosophila ortholog of CLOCK INTERACTING PROTEIN CIRCADIAN

PROVIDER: PRJNA693022 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13478600.fastq.gz	Fastqsanger.gz
	SRR13478601.fastq.gz	Fastqsanger.gz
	SRR13478602.fastq.gz	Fastqsanger.gz
	SRR13478603.fastq.gz	Fastqsanger.gz
	SRR13478604.fastq.gz	Fastqsanger.gz

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CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the Drosophila ortholog of CLOCK INTERACING PROTEIN, CIRCADIAN (RNA-Seq)

Project description:The Drosophila circadian clock is driven by a transcriptional feedback loop in which the bHLH transcription factor CLOCK-CYCLE (CLK-CYC) binds E-boxes to transcribe genes encoding the PERIOD-TIMELESS (PER-TIM) repressor, which releases CLK-CYC from E-boxes to inhibit transcription. The bHLH-Orange transcription factor CLOCKWORK ORANGE (CWO) reinforces repression by binding E-boxes to displace CLK-CYC, but also acts through an unknown mechanism to promote CLK-CYC transcription. To determine how CWO activates CLK-CYC transcription, we identified CWO DNA binding targets that are upregulated in the absence of CWO repression, conserved in mammals and preferentially expressed in brain pacemaker neurons. Among the genes identified was the Drosophila ortholog of mammalian Clock Interacting Protein Circadian (Cipc) that acts to repress CLOCK-BMAL1 transcription. Reducing or eliminating Drosophila Cipc expression shortens circadian period while overexpressing Cipc lengthens circadian period in flies, consistent with previous analysis showing that Drosophila Cipc represses CLK-CYC transcription in S2 cell culture. Long period rhythms of cwo mutant flies are largely rescued when Cipc expression is reduced or eliminated, indicating that increased Cipc expression mediates period lengthening of cwo mutants. These results suggest a mechanism for CWO-dependent CLK-CYC activation: CWO inhibition of CIPC repression promotes CLK-CYC transcription. Such a mechanism may be conserved given that orthologs of cwo and Cipc carry out analogous roles in the mammalian circadian clock.

2021-07-23 | GSE165043 | GEO

CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the putative Drosophila ortholog of CLOCK INTERACTING PROTEIN CIRCADIAN.

Project description:The Drosophila circadian clock is driven by a transcriptional feedback loop in which CLOCK-CYCLE (CLK-CYC) binds E-boxes to transcribe genes encoding the PERIOD-TIMELESS (PER-TIM) repressor, which releases CLK-CYC from E-boxes to inhibit transcription. CLOCKWORK ORANGE (CWO) reinforces PER-TIM repression by binding E-boxes to maintain PER-TIM bound CLK-CYC off DNA, but also promotes CLK-CYC transcription through an unknown mechanism. To determine how CWO activates CLK-CYC transcription, we identified CWO target genes that are upregulated in the absence of CWO repression, conserved in mammals, and preferentially expressed in brain pacemaker neurons. Among the genes identified was a putative ortholog of mouse Clock Interacting Protein Circadian (Cipc), which represses CLOCK-BMAL1 transcription. Reducing or eliminating Drosophila Cipc expression shortens period, while overexpressing Cipc lengthens period, which is consistent with previous work showing that Drosophila Cipc represses CLK-CYC transcription in S2 cells. Cipc represses CLK-CYC transcription in vivo, but not uniformly, as per is strongly repressed, tim less so, and vri hardly at all. Long period rhythms in cwo mutant flies are largely rescued when Cipc expression is reduced or eliminated, indicating that increased Cipc expression mediates the period lengthening of cwo mutants. Consistent with this behavioral rescue, eliminating Cipc rescues the decreased CLK-CYC transcription in cwo mutant flies, where per is strongly rescued, tim is moderately rescued, and vri shows little rescue. These results suggest a mechanism for CWO-dependent CLK-CYC activation: CWO inhibition of CIPC repression promotes CLK-CYC transcription. This mechanism may be conserved since cwo and Cipc perform analogous roles in the mammalian circadian clock.

| S-EPMC8511158 | biostudies-literature

CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the Drosophila ortholog of CLOCK INTERACING PROTEIN, CIRCADIAN (RNA-Seq)

Project description:CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the Drosophila ortholog of CLOCK INTERACING PROTEIN, CIRCADIAN (RNA-Seq)

| PRJNA693024 | ENA

CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the Drosophila ortholog of CLOCK INTERACING PROTEIN, CIRCADIAN (ChIP-Seq)

Project description:CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the Drosophila ortholog of CLOCK INTERACING PROTEIN, CIRCADIAN (ChIP-Seq)

| PRJNA693023 | ENA

CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the putative Drosophila ortholog of CLOCK INTERACTING PROTEIN CIRCADIAN

Project description:This SuperSeries is composed of the SubSeries listed below.

2021-07-23 | GSE165044 | GEO

CLOCKWORK ORANGE promotes CLOCK-CYCLE activation via the Drosophila ortholog of CLOCK INTERACING PROTEIN, CIRCADIAN (ChIP-Seq)

Project description:CWO reinforces PER-TIM repression of core clock gene transcription by antagonizing CLK-CYC binding to E-boxes, but also functions to promote CLK-CYC transcription of core clock genes. To determine the relationship between CWO and CLK-CYC binding across the genome, we identified CWO and CLK binding sites via ChIP-seq.

2021-07-23 | GSE165042 | GEO

Clockwork orange-mediated control of sugar responsive transcription

Project description:Clockwork orange-mediated control of sugar responsive transcription

| PRJNA854137 | ENA

Clockwork orange encodes a transcriptional repressor important for circadian-clock amplitude in Drosophila.

Project description:Gene transcription is a central timekeeping process in animal clocks. In Drosophila, the basic helix-loop helix (bHLH)-PAS transcription-factor heterodimer, CLOCK/CYCLE (CLK/CYC), transcriptionally activates the clock components period (per), timeless (tim), Par domain protein 1 (Pdp1), and vrille (vri), which feed back and regulate distinct features of CLK/CYC function. Microarray studies have identified numerous rhythmically expressed transcripts, some of which are potential direct CLK targets. Here we demonstrate a circadian function for one such target, a bHLH-Orange repressor, CG17100/CLOCKWORK ORANGE (CWO). cwo is rhythmically expressed, and levels are reduced in Clk mutants, suggesting that cwo is CLK activated in vivo. cwo mutants display reduced-amplitude molecular and behavioral rhythms with lengthened periods. Molecular analysis suggests that CWO acts, in part, by repressing CLK target genes. We propose that CWO acts as a transcriptional and behavioral rhythm amplifier.

| S-EPMC1963421 | biostudies-literature

Disruption of circadian clockwork in in vivo reprogramming-induced mouse kidney tumors

Project description:The circadian clock, which regulates cellular physiology, such as energy metabolism, resides in each cell level throughout the body. Recently, it has been elucidated that the cellular circadian clock is closely linked with cellular differentiation. Moreover, the misregulation of cellular differentiation in mouse embryonic stem cells (ESCs) induced abnormally differentiated cells with impaired circadian clock oscillation, concomitant with the post-transcriptional suppression of CLOCK proteins. Here, we show that the circadian molecular oscillation is disrupted in dysdifferentiation-mediated mouse kidney tumors induced by partial in vivo reprogramming, resembling Wilms tumors. The expression of CLOCK protein was dramatically reduced in the tumor cells despite the Clock mRNA expression. We also showed that a similar loss of CLOCK was observed in human Wilms tumors, suggesting that the circadian molecular clockwork may be disrupted in dysdifferentiation-mediated embryonal tumors such as Wilms tumors, similar to the in vivo reprogramming induced mouse kidney tumors. These results support our previous reports and may provide a novel viewpoint for understanding the pathophysiological nature of cancers through the correlation between cellular differentiation and circadian clock.

2018-02-13 | GSE107261 | GEO

The role of clockwork orange in the circadian clock of the cricket Gryllus bimaculatus.

Project description:The circadian clock generates rhythms of approximately 24?h through periodic expression of the clock genes. In insects, the major clock genes period (per) and timeless (tim) are rhythmically expressed upon their transactivation by CLOCK/CYCLE, with peak levels in the early night. In Drosophila, clockwork orange (cwo) is known to inhibit the transcription of per and tim during the daytime to enhance the amplitude of the rhythm, but its function in other insects is largely unknown. In this study, we investigated the role of cwo in the clock mechanism of the cricket Gryllus bimaculatus. The results of quantitative RT-PCR showed that under a light/dark (LD) cycle, cwo is rhythmically expressed in the optic lobe (lamina-medulla complex) and peaks during the night. When cwo was knocked down via RNA interference (RNAi), some crickets lost their locomotor rhythm, while others maintained a rhythm but exhibited a longer free-running period under constant darkness (DD). In cwoRNAi crickets, all clock genes except for cryptochrome 2 (cry2) showed arrhythmic expression under DD; under LD, some of the clock genes showed higher mRNA levels, and tim showed rhythmic expression with a delayed phase. Based on these results, we propose that cwo plays an important role in the cricket circadian clock.

| S-EPMC7659126 | biostudies-literature

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