Period (gene)

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Structures	Swiss-model
Domains	InterPro

per
per
Identifiers
Organism	D. melanogaster
Symbol	per
Entrez	31251
RefSeq (mRNA)	NM_080317
RefSeq (Prot)	NP_525056
UniProt	P07663
Other data
Chromosome	X: 2.58 - 2.59 Mb
Structures
Search for
Structures	Swiss-model
Domains	InterPro

Period (per) is a gene located on the X chromosome of Drosophila melanogaster. Oscillations in levels of both per transcript and its corresponding protein PER have a period of approximately 24 hours and together play a central role in the molecular mechanism of the Drosophila biological clock driving circadian rhythms in eclosion and locomotor activity.^[1]^[2] Mutations in the per gene can shorten (per^S), lengthen (per^L), and even abolish (per⁰) the period of the circadian rhythm.^[1]

^ ^a ^b Cite error: The named reference PERcycle was invoked but never defined (see the help page).
^ Dunlap, JC (January 1999). "Molecular Bases for Circadian Clocks". Cell. 96 (2): 271–290. doi:10.1016/S0092-8674(00)80566-8. PMID 9988221. S2CID 14991100.

[PERcycle-1] Cite error: The named reference PERcycle was invoked but never defined (see the help page).

[DunlapReview-2] Dunlap, JC (January 1999). "Molecular Bases for Circadian Clocks". Cell. 96 (2): 271–290. doi:10.1016/S0092-8674(00)80566-8. PMID 9988221. S2CID 14991100.

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