PER2 rs1029124354: Understanding Your Circadian Clock Variant
The rs1029124354 variant is a rare genetic change located within the PER2 gene, which plays a central role in regulating the body's internal clock. Research has associated this specific variant with variations in sleep timing and the development of evening chronotypes.
What each genotype means
Typical circadian rhythm
This genotype represents the most common genetic state for this location in the PER2 gene. It is not associated with the specific sleep timing variations linked to this variant in research studies. You likely follow standard population patterns for circadian regulation.
This is the most common genotype, found in the vast majority of the global population.
Potential circadian variation
This genotype includes one copy of the variant associated with familial delayed sleep phase syndrome and evening chronotypes. While research suggests an association with altered sleep timing, the clinical significance for an individual carrier is not fully established and may be influenced by other genetic and environmental factors. Please consult a sleep specialist if you experience persistent sleep-wake disturbances.
This genotype is very rare, occurring in approximately 0.03% of the general population based on current gnomAD data.
Rare circadian variant
This genotype carries two copies of the variant linked to familial delayed sleep phase syndrome and evening chronotypes. Research indicates this variant may influence your internal circadian clock, potentially predisposing you to a later sleep-wake preference. Because this is a rare finding, its impact on your specific sleep health should be discussed with a healthcare provider or sleep medicine specialist.
This genotype is extremely rare, with a frequency significantly lower than 0.01% in the general population.
What is the rs1029124354 Variant?
The rs1029124354 variant is a single-nucleotide polymorphism (SNP) situated in an intronic region of the PER2 gene. Introns are non-coding segments of DNA that reside within a gene but are removed during the process of creating a protein. While they do not directly provide the instructions for building a protein, intronic variants can influence how genes are expressed, regulated, or spliced. In the case of rs1029124354, its location within the PER2 gene suggests it may play a role in modulating the activity of the circadian clock system. Because this variant is located in a region that helps govern the timing of biological processes, researchers study it to understand how subtle genetic differences contribute to the wide spectrum of human sleep patterns and preferences.
The Role of the PER2 Gene
The PER2 gene, or Period Circadian Regulator 2, is a fundamental component of the mammalian circadian clock. It is expressed in the suprachiasmatic nucleus, the brain's primary pacemaker, and helps coordinate the 24-hour cycle of physiological processes, including sleep, metabolism, and body temperature. The protein encoded by PER2 functions as part of a complex feedback loop; it is upregulated by other clock proteins and subsequently acts to repress that same activity, creating a rhythmic oscillation. Because of this critical role, mutations or variations in PER2 are frequently investigated in the context of sleep-wake disorders. While some variants are linked to extreme conditions like Familial Advanced Sleep Phase Syndrome, others are associated with more common variations in chronotype, such as a natural preference for staying up late or waking up early.
Research and Evidence
Current research into rs1029124354 is focused on its association with sleep timing and chronotype. Scientific literature has identified this variant in studies exploring familial delayed sleep phase syndrome and evening-oriented sleep preferences. The evidence strength for this specific association is currently considered moderate, as the field of circadian genetics is complex and involves many interacting genes. While some variants in PER2 have been clearly linked to Mendelian sleep disorders, the functional impact of intronic variants like rs1029124354 is often more nuanced. Researchers continue to analyze how such variants might alter the timing of the circadian clock, but it is important to note that sleep behavior is a polygenic trait, meaning it is influenced by many different genes and environmental factors working in concert.
Population Frequency
The rs1029124354 variant is classified as very rare in the general population. According to data from the Genome Aggregation Database (gnomAD), the minor allele frequency is approximately 0.00017. This low frequency means that the vast majority of individuals do not carry this specific variant. Because it is so uncommon, large-scale population studies are required to fully understand its distribution across different ancestral groups. The rarity of the variant also highlights the importance of studying specific families or cohorts where the variant may be more prevalent, as these groups provide the most valuable insights into how the variant influences sleep phenotypes in a real-world context.
Interpreting Your Genetic Information
If you have information about your status for the rs1029124354 variant, it is important to view it as one small piece of a much larger biological puzzle. Genetic variants do not act in isolation; your sleep habits are shaped by a combination of your unique genetic makeup, your environment, and your lifestyle choices. This information is for educational purposes and should not be used to diagnose any sleep disorder or medical condition. If you are experiencing persistent issues with your sleep, such as difficulty falling asleep, staying awake, or maintaining a consistent schedule, you should consult with a healthcare professional or a sleep specialist. They can provide a comprehensive evaluation and discuss evidence-based strategies to help you manage your sleep health effectively.
How common is this variant?
The rs1029124354 variant is very rare in general populations, with a minor allele frequency of approximately 0.00017 according to gnomAD.
Frequently asked questions
Can this variant diagnose a sleep disorder?
No, this variant cannot be used to diagnose a sleep disorder. Sleep disorders are complex conditions that require a clinical evaluation by a healthcare professional.
What is an evening chronotype?
An evening chronotype, often called a 'night owl,' refers to a natural preference for going to sleep later and waking up later than the average person.
Is the PER2 gene only involved in sleep?
While PER2 is best known for its role in the circadian clock, it also influences other physiological processes, including metabolism and body temperature regulation.
Should I change my sleep schedule based on this result?
You should not change your medical or sleep management based on a single genetic variant. Always discuss your sleep concerns with a doctor or sleep specialist.
Sources & further reading
Educational information only, last refreshed 9/20/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Pathogenic missense variant (Ser662Gly) in PER2 that impairs casein kinase phosphorylation, causing familial advanced sleep phase syndrome (FASPS-1).
This intronic variant in the PER2 gene is associated with individual differences in circadian rhythm, sleep timing, and chronotype.
Common missense/synonymous tagging variant in core clock gene PER2 modulating eveningness preference and diurnal phase delay.
Variant in the circadian regulator PER2 associated with circadian rhythm phase, chronotype, and timing of habitual sleep.
This variant is associated with familial advanced sleep phase syndrome, affecting the timing of the sleep-wake cycle.
A mutation in the PER2 gene associated with familial advanced sleep phase syndrome, leading to an earlier sleep-wake cycle.