PMID- 10521578 OWN - NLM STAT- MEDLINE DCOM- 19991223 LR - 20190826 IS - 0169-328X (Print) IS - 0169-328X (Linking) VI - 71 IP - 2 DP - 1999 Aug 25 TI - Circadian regulation of cryptochrome genes in the mouse. PG - 238-43 AB - Cryptochromes are non-opsin photoactive pigments which have been recently implicated in circadian photoentrainment. In humans and mice, two cryptochromes, called CRY1 and CRY2, have been identified. Previously, it was shown that the expression of mCry1 oscillates with circadian periodicity in the suprachiasmatic nucleus (SCN) of the mouse. Herein, we have investigated the expression patterns of both mCry1 and mCry2 in various tissues and the effect of Cry2 knockout on Cry1 expression. First, the expression of Cry1 in the SCN, in contrast to mPer1 and other immediate early genes, is not inducible by acute light pulses. Second, we found that Cry1 transcription follows a circadian pattern in the liver and skeletal muscle. Third, mutation in Cry2 causes a phase delay in Cry1 and mPer1 expression both in the SCN and internal organs relative to wild-type animals. Finally, no obvious periodicity in mCry2 expression was seen in all tissues tested. FAU - Miyamoto, Y AU - Miyamoto Y AD - Department of Biochemistry and Biophysics, Mary Ellen Jones Bldg., CB# 7260, University of North Carolina School of Medicine, Chapel Hill, NC 27599-7260, USA. FAU - Sancar, A AU - Sancar A LA - eng SI - GENBANK/AB000777 SI - GENBANK/AB002108 SI - GENBANK/AB003433 GR - GM31082/GM/NIGMS NIH HHS/United States PT - Journal Article PT - Research Support, U.S. Gov't, P.H.S. PL - Netherlands TA - Brain Res Mol Brain Res JT - Brain research. Molecular brain research JID - 8908640 RN - 0 (CRY1 protein, human) RN - 0 (CRY2 protein, human) RN - 0 (Cry1 protein, mouse) RN - 0 (Cry2 protein, mouse) RN - 0 (Cryptochromes) RN - 0 (Drosophila Proteins) RN - 0 (Eye Proteins) RN - 0 (Flavoproteins) RN - 0 (Receptors, G-Protein-Coupled) RN - 0 (cry protein, Drosophila) RN - EC 3.1.- (Ribonucleases) SB - IM MH - Animals MH - Biological Clocks/*genetics MH - Cells, Cultured MH - *Circadian Rhythm/*physiology MH - Cryptochromes MH - *Drosophila Proteins MH - *Eye Proteins MH - Flavoproteins/*genetics MH - *Gene Expression Regulation MH - Liver/metabolism MH - Male MH - Mice MH - Mice, Inbred C57BL MH - Molecular Sequence Data MH - Muscle, Skeletal/metabolism MH - *Photoreceptor Cells, Invertebrate MH - Receptors, G-Protein-Coupled MH - Ribonucleases/metabolism MH - Suprachiasmatic Nucleus/metabolism MH - Testis/metabolism EDAT- 1999/10/16 00:00 MHDA- 1999/10/16 00:01 CRDT- 1999/10/16 00:00 PHST- 1999/10/16 00:00 [pubmed] PHST- 1999/10/16 00:01 [medline] PHST- 1999/10/16 00:00 [entrez] AID - S0169328X99001928 [pii] AID - 10.1016/s0169-328x(99)00192-8 [doi] PST - ppublish SO - Brain Res Mol Brain Res. 1999 Aug 25;71(2):238-43. doi: 10.1016/s0169-328x(99)00192-8.