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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID 		Per1+
wild type
MGI:2434787
Summary 2 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
ht1
 		Per1Hftm/Per1+ C57BL/6J-Per1Hftm/JtJ MGI:3522344
ht2
 		Per1tm1Saco/Per1+ involves: 129S2/SvPas MGI:3845778


Genotype
MGI:3522344
ht1
Allelic
Composition		 Per1Hftm/Per1+
Genetic
Background		 C57BL/6J-Per1Hftm/JtJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Per1Hftm mutation (1 available); any Per1 mutation (65 available)
♀ phenotype observed in females
♂ phenotype observed in males
N normal phenotype
behavior/neurological
shortened circadian behavior period ( J:91116 )
• short circadian free-running period in constant darkness




Genotype
MGI:3845778
ht2
Allelic
Composition		 Per1tm1Saco/Per1+
Genetic
Background		 involves: 129S2/SvPas
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Per1tm1Saco mutation (0 available); any Per1 mutation (65 available)
♀ phenotype observed in females
♂ phenotype observed in males
N normal phenotype
behavior/neurological
abnormal circadian behavior phase ( J:98340 )
• following exposure to prolonged light the magnitude of the induced phase delay is slightly but significantly larger compared to wild-type controls




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
03/24/2026
MGI 6.24 		The Jackson Laboratory