PER3 rs150812083: Circadian Rhythm and Sleep Phase
The genetic variant rs150812083 is a rare missense single nucleotide polymorphism situated within the PER3 gene on chromosome 1. Published circadian biology research links this alteration to familial advanced sleep phase syndrome, a condition where individuals experience persistently early sleep and wake times. While functional studies show that it modifies core molecular clock dynamics, evidence across large diverse populations remains preliminary due to its rarity.
What each genotype means
Typical circadian rhythm profile
This is the most common genotype observed in the general population. It is considered the reference state for the PER3 gene in this context, and individuals with this genotype do not carry the specific variant associated with familial advanced sleep phase syndrome.
This is the predominant genotype found in the vast majority of the human population.
Potential circadian rhythm variation
This genotype involves one copy of the variant allele, which has been identified in research involving families with advanced sleep phase syndrome and seasonal mood traits. Because this variant is rare, its clinical significance in the general population is not fully established, and you should discuss any concerns regarding sleep patterns or mood with a healthcare professional.
This genotype is rare, occurring in less than 0.01% of the population based on gnomAD data.
Rare circadian rhythm variant
This genotype consists of two copies of the rare variant allele. Research has linked this variant to altered circadian clock function and potential associations with advanced sleep phase and mood-related traits, though evidence is primarily derived from specific family studies. Please consult with a clinician if you have questions about your sleep-wake cycle or behavioral health.
This genotype is extremely rare and is not commonly observed in general population cohorts.
Genomic Context and the rs150812083 Variant
The single nucleotide polymorphism rs150812083 represents a specific single-base substitution located within exon coding regions of the PER3 (period circadian regulator 3) gene on chromosome 1p36.23. The reference human genome assembly carries the ancestral allele, while the alternative allele causes a missense substitution that alters the underlying protein sequence of the PERIOD3 protein. Because coding changes can modify tertiary structure, protein stability, or binding affinities with partner molecules, missense variants in core timing machinery frequently capture scientific interest. Genomic registries such as dbSNP catalogue rs150812083 under circadian rhythm trait associations. Unlike common structural markers in this gene—such as the well-studied variable number tandem repeat (VNTR)—rs150812083 is an exceptionally low-frequency point mutation. Identifying this specific locus requires high-resolution targeted sequencing or high-density array genotyping, as it is largely absent from standard recreational panels.
The Biological Role of the PER3 Clock Gene
The PER3 gene encodes an essential member of the mammalian PERIOD family of proteins, functioning within the suprachiasmatic nucleus of the anterior hypothalamus to direct endogenous circadian rhythms. Circadian timing operates via an autoregulatory transcriptional-translational feedback loop. In this molecular circuit, CLOCK and BMAL1 (ARNTL) heterodimers activate the transcription of PER (PER1, PER2, PER3) and CRY genes. As PER and CRY proteins accumulate in the cytoplasm, they form complexes, undergo phosphorylation, and translocate back into the nucleus to repress CLOCK and BMAL1 activity, effectively completing an approximate 24-hour cycle. Although PER1 and PER2 are traditionally viewed as the primary pacemakers of this oscillation, PER3 fine-tunes clock resilience, circadian period length, sleep homeostasis, and light entrainment. Genetic variations in PER3 can subtly alter the kinetics of phosphorylation or degradation, shifting the biological clock earlier or later.
Scientific Evidence: Familial Advanced Sleep Phase Syndrome
Published research in chronobiology and sleep medicine has evaluated rs150812083 in the context of Familial Advanced Sleep Phase Syndrome 3 (FASPS3; OMIM 616882). Clinical observations demonstrate that individuals carrying this variant, often in combination or comparison with related missense alleles like rs139315125, exhibit an advanced sleep-wake phase characterized by compelling sleepiness in the early evening (often 6:00 PM to 8:00 PM) and spontaneous early-morning awakenings (often 2:00 AM to 4:00 AM). Experimental models and cellular assays published in chronobiology literature indicate that PER3 missense alterations can alter clock period length in vitro and modulate sleep-wake architectural homeostasis. However, scientific evidence strength is graded as moderate rather than conclusive: because familial cohorts are small and the variant is exceptionally rare in the general public, broad generalizability across diverse unselected populations remains limited.
Population Frequency and Ancestry Insights
According to the Genome Aggregation Database (gnomAD) and international reference sets, rs150812083 is an ultra-rare variant, presenting with an overall minor allele frequency well below 0.0001 (<0.01%). It has been identified almost exclusively within single-family pedigrees presenting with pronounced familial morning chronotypes or sporadic extreme-morning preference cohorts. The overwhelmingly common genotype across all global populations—including European, African, East Asian, South Asian, and Latino ancestries—is homozygous for the reference allele. Because the variant occurs at such negligible frequencies, statistical associations outside the framework of familial segregation studies must be interpreted with caution, as widespread epidemiological evidence in healthy unrelated cohorts is inherently sparse.
Interpreting Results: Practical Implications and Limitations
Discovering an atypical genotype at rs150812083 provides fascinating biological insights into personal chronobiology, but it is not an absolute medical diagnosis. Circadian timing and sleep habits represent complex multifactorial traits governed by dozens of genetic loci alongside environmental factors, such as ambient light exposure, occupational schedules, screen use, and age. Carrying a rare PER3 variant does not guarantee severe sleep disruption, nor does an ordinary reference genotype guarantee standard sleep timing. If an individual experiences disruptive daytime sleepiness, chronic phase mismatch, or suspected sleep-wake disorders, they should consult a board-certified sleep specialist or medical professional for objective clinical evaluation rather than relying on genomic reports alone.
How common is this variant?
The rs150812083 variant is ultra-rare in global population databases such as gnomAD, with a minor allele frequency documented at less than 0.0001 (<0.01%). The vast majority of individuals of all ancestries are homozygous for the common reference allele.
Frequently asked questions
What is familial advanced sleep phase syndrome?
Familial advanced sleep phase syndrome is an inherited circadian rhythm condition where a person's biological clock is shifted significantly earlier than normal. Individuals with this condition naturally feel sleepy early in the evening (often between 6:00 PM and 9:00 PM) and wake up spontaneously in the very early morning (between 2:00 AM and 5:00 AM), while still experiencing normal sleep quality and total duration.
Does having the rs150812083 variant mean I am definitely an extreme morning lark?
No. While the variant has shown moderate association with advanced sleep phase phenotypes within studied families, human sleep timing is polygenic and heavily influenced by environmental cues like sunlight, social schedules, and work habits. Genetics alone does not dictate an absolute sleep schedule.
How does PER3 influence the biological clock?
The PER3 gene provides instructions for making the PERIOD3 protein, which participates in the core feedback loop regulating circadian rhythms in the brain. PERIOD proteins accumulate and degrade on an approximate 24-hour cycle to govern metabolic processes, hormone release, and the body's natural sleep-wake cycle.
Can genetic testing for rs150812083 diagnose a circadian sleep disorder?
No, genetic testing for this single marker is not an approved standalone diagnostic tool for sleep disorders. Circadian rhythm sleep-wake disorders are diagnosed clinically by medical providers using sleep logs, actigraphy, and comprehensive medical evaluations.
Sources & further reading
Educational information only, last refreshed 9/7/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This SNP is associated with chronotype scores in older adults, suggesting a role in circadian regulation.
This SNP is associated with average delta power during sleep, a marker of sleep intensity.
Common synonymous variant in PER3 tightly linked with circadian diurnal preference and morningness-eveningness tendencies.
Missense variant P415A in PER3 associated with familial advanced sleep phase syndrome and circadian phase preference.
Promoter/intronic variant of PER3 tagging circadian phase angle, diurnal preference, and homeostatic sleep pressure response to sleep loss.
Part of a well-characterized functional haplotype in PER3 influencing individual diurnal preference and susceptibility to delayed sleep phase syndrome.