PMID- 10612401 OWN - NLM STAT- MEDLINE DCOM- 20000118 LR - 20220321 IS - 0092-8674 (Print) IS - 0092-8674 (Linking) VI - 99 IP - 6 DP - 1999 Dec 10 TI - Cycling vrille expression is required for a functional Drosophila clock. PG - 661-71 AB - We identified a novel regulatory loop within Drosophila's circadian clock. A screen for clock-controlled genes recovered vrille (vri), a transcription factor essential for embryonic development. vri is expressed in circadian pacemaker cells in larval and adult brains. vri RNA levels oscillate with a circadian rhythm. Cycling is directly regulated by the transcription factors dCLOCK and CYCLE, which are also required for oscillations of period and timeless RNA. Eliminating the normal vri cycle suppresses period and timeless expression and causes long-period behavioral rhythms and arrhythmicity, indicating that cycling vri is required for a functional Drosophila clock. We also show that dCLOCK and VRI independently regulate levels of a neuropeptide, pigment dispersing factor, which appears to regulate overt behavior. FAU - Blau, J AU - Blau J AD - Laboratory of Genetics, The Rockefeller University, New York, New York 10021, USA. FAU - Young, M W AU - Young MW LA - eng GR - GM54339/GM/NIGMS NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, Non-P.H.S. PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Cell JT - Cell JID - 0413066 RN - 0 (ARNTL Transcription Factors) RN - 0 (Basic Helix-Loop-Helix Transcription Factors) RN - 0 (Clk protein, Drosophila) RN - 0 (Drosophila Proteins) RN - 0 (Insect Proteins) RN - 0 (Trans-Activators) RN - 0 (Transcription Factors) RN - 0 (cyc protein, Drosophila) RN - 0 (vri protein, Drosophila) RN - EC 2.3.1.48 (CLOCK Proteins) SB - IM MH - ARNTL Transcription Factors MH - Animals MH - Basic Helix-Loop-Helix Transcription Factors MH - Biological Clocks/*genetics MH - Brain/metabolism MH - CLOCK Proteins MH - Circadian Rhythm/genetics MH - Drosophila/embryology/*genetics/metabolism MH - *Drosophila Proteins MH - Gene Expression Regulation, Developmental MH - Insect Proteins/genetics/*metabolism MH - Larva MH - Trans-Activators/genetics/metabolism MH - Transcription Factors/genetics/*metabolism EDAT- 1999/12/28 00:00 MHDA- 1999/12/28 00:01 CRDT- 1999/12/28 00:00 PHST- 1999/12/28 00:00 [pubmed] PHST- 1999/12/28 00:01 [medline] PHST- 1999/12/28 00:00 [entrez] AID - S0092-8674(00)81554-8 [pii] AID - 10.1016/s0092-8674(00)81554-8 [doi] PST - ppublish SO - Cell. 1999 Dec 10;99(6):661-71. doi: 10.1016/s0092-8674(00)81554-8.