Per2 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
.infobox .infobox-gene
| Gene Symbol | PER2 |
|---|---|
| Gene Name | Period Circadian Regulator 2 |
| Chromosome | 2p13 |
| NCBI Gene ID | 8864 |
| OMIM ID | 603714 |
| Ensembl ID | ENSG00000132266 |
| UniProt ID | Q8BZD0 |
| Associated Diseases | Familial Advanced Sleep Phase Syndrome, Alzheimer's Disease, Depression, Metabolic Disorders |
| --- | --- |
| Categories | Circadian Rhythm, Transcriptional Regulation, Sleep Biology |
PER2 (Period Circadian Regulator 2) is a key circadian clock gene that plays a fundamental role in maintaining circadian rhythms in mammals. As part of the core clock machinery, PER2 works in concert with PER1 and PER3 to generate the approximately 24-hour oscillations that regulate sleep, metabolism, hormone release, and numerous other physiological processes [1][2]. Mutations in PER2 have been linked to familial advanced sleep phase syndrome (FASPS) and have been associated with increased risk for neurodegenerative diseases, metabolic disorders, and mood disorders.
PER2 is a core clock gene essential for circadian rhythm generation. It plays a critical role in the negative feedback loop of the molecular clock and links environmental cues to circadian timing[1].
PER2 is central to the circadian transcriptional-translational feedback loop:
PER2 is particularly important for light entrainment:
PER2 regulates metabolic genes:
PER2 dysregulation contributes to AD pathophysiology:
PER2 is implicated in mood disorders:
Circadian variation in stroke:
PER2 mutations are strongly associated with familial advanced sleep phase syndrome (FASPS), characterized by early sleep times (6-9 PM) and early morning awakenings (2-4 AM). The S662G mutation in PER2 is a well-documented cause of FASPS, demonstrating the critical role of PER2 in regulating sleep timing [3][4].
PER2 plays a significant role in metabolic regulation, influencing glucose homeostasis, insulin sensitivity, and lipid metabolism. Disruption of PER2 rhythms contributes to metabolic syndrome and obesity. Time-restricted feeding that aligns with circadian rhythms can improve metabolic outcomes in part through PER2-mediated mechanisms [5].
PER2 functions as a tumor suppressor, with decreased expression observed in various cancers including breast, prostate, and hepatocellular carcinoma. The circadian clock disruption through PER2 dysregulation promotes cell proliferation and tumor growth [6].
The study of Per2 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
[1] PER2 clock function (2020)
[2] PER2 metabolic regulation (2019)