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Phenotypes Associated with This Genotype
Genotype
MGI:3522462
Allelic
Composition		 Cry1tm1Jhjh/Cry1tm1Jhjh
Per2tm1Brd/Per2tm1Brd
Genetic
Background		 involves: 129P2/OlaHsd * 129S7/SvEvBrd * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cry1tm1Jhjh mutation (0 available); any Cry1 mutation (40 available)
Per2tm1Brd mutation (1 available); any Per2 mutation (73 available)
♀ phenotype observed in females
♂ phenotype observed in males
N normal phenotype
behavior/neurological
arrhythmic circadian behavior persistence ( J:79492 )
• when placed in DD, double homozygotes are completely arrhythmic (total absence of a circadian clock)

Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO)
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Send questions and comments to User Support. 		last database update
01/20/2026
MGI 6.24 		The Jackson Laboratory