ADRB1 rs121912613: What Your Genotype Means
The rs121912613 variant is a rare genetic change located in the ADRB1 gene. It has been identified in scientific studies as a potential contributor to familial natural short sleep, a trait where individuals require less sleep than average without negative health impacts.
What each genotype means
Typical sleep duration
This genotype represents the common, non-variant form of the ADRB1 gene. It is not associated with the familial natural short sleep trait identified in research studies. Most individuals in the general population carry this genotype.
This is the most common genotype found in the general population across all ancestries.
Potential short sleep association
This genotype includes a rare variant (often referred to as A187V or c.560C>T) that has been identified in families with a natural short sleep trait, where individuals require only 4 to 6 hours of sleep without negative health effects. However, research indicates that the presence of this variant in the general population does not consistently correlate with self-reported short sleep duration, suggesting that its effect may be highly dependent on specific genetic or environmental contexts. This finding is based on limited family-based studies and should not be used to infer personal sleep requirements.
This specific variant is rare and is not commonly found in the general population.
Understanding the Variant
The variant rs121912613, also known as c.560C>T or p.Ala187Val, is a single nucleotide change in the ADRB1 gene. This specific mutation results in an amino acid substitution where alanine is replaced by valine at position 187 within the protein structure. This site is located in the fourth transmembrane domain of the beta-1 adrenergic receptor, a region that is highly conserved across species. Because this variant is rare, it is not typically found in the general population at high frequencies. Researchers identified this change through 'phenotype-first' studies, where they first observed families with the natural short sleep trait and then performed genetic sequencing to find the underlying cause. This approach differs from 'genotype-first' studies, which look at large population databases to see how a specific genetic change affects the average person.
The Role of the ADRB1 Gene
The ADRB1 gene provides instructions for creating the beta-1 adrenergic receptor. This receptor is a type of G protein-coupled receptor that plays a critical role in the body's response to catecholamines, such as epinephrine and norepinephrine. These chemicals are essential for regulating various physiological processes, including heart rate and the sleep-wake cycle. In the brain, ADRB1-expressing neurons are known to be active during wakefulness and REM sleep. Research suggests that the mutated version of this receptor may alter the activity of these neurons, potentially making them more easily activated. This increased sensitivity could theoretically contribute to the wakefulness-promoting effects observed in individuals who carry this variant, as the receptor's altered function may influence how the brain manages the transition between sleep and wake states.
Evidence and Associations
The evidence linking rs121912613 to familial natural short sleep is considered moderate and is primarily derived from studies of specific, multigenerational families. In these family-based studies, the variant was found to segregate with the short sleep trait, meaning family members who slept significantly less than average (typically 4 to 6 hours) also carried the mutation. However, it is important to note that when researchers looked for this variant in large, population-based cohorts like the UK Biobank, they did not find a clear association between this specific variant and self-reported short sleep duration in the general population. This suggests that while the variant may be a strong driver of the trait within specific family lineages, its effect in the broader, genetically diverse population remains uncertain and may be influenced by other genetic or environmental factors.
What This Information Means for You
If you have received information about this variant, it is important to interpret it within the context of current scientific limitations. This variant is extremely rare, and its association with sleep patterns is based on limited family studies rather than broad population data. Having this variant does not necessarily mean you will exhibit the natural short sleep trait, nor does it provide a complete picture of your sleep health. Genetic testing results should never be used to self-diagnose or make medical decisions. If you have concerns about your sleep duration, quality, or daytime functioning, the most appropriate step is to consult with a healthcare professional or a sleep specialist. They can evaluate your symptoms, medical history, and lifestyle to provide personalized guidance, rather than relying on individual genetic markers that may not be predictive for the general public.
How common is this variant?
The rs121912613 variant is considered rare across all major ancestral populations. It is not commonly observed in large-scale genomic databases.
Frequently asked questions
Is rs121912613 a cause of insomnia?
No, this variant is associated with 'familial natural short sleep,' which is distinct from insomnia. Individuals with this trait sleep for fewer hours than average but do not experience the daytime fatigue or negative health consequences typically associated with insomnia.
Can I use this test to see if I need less sleep?
No. Current research indicates that this variant is rare and its effects are not well-established in the general population. You should not use genetic testing to determine your sleep needs or to justify sleep deprivation.
What should I do if I have this variant?
If you are concerned about your sleep patterns, you should discuss them with a doctor or a sleep specialist. They can assess your overall health and sleep quality, which are more important than the presence of a single genetic variant.
Is this variant found in everyone?
No, this is a rare variant. The vast majority of the human population carries the common C allele at this position in the ADRB1 gene.
Sources & further reading
Educational information only, last refreshed 10/14/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This SNP in the beta-1 adrenergic receptor gene is involved in catecholamine signaling, potentially influencing heart rate response and cardiovascular adaptation to aerobic exercise.
The Ser49Gly missense polymorphism alters beta-1 adrenergic receptor downregulation, impacting resting heart rate and peak cardiovascular output during endurance performance.
Rare missense variant (Ala187Val) in the beta-1 adrenergic receptor gene ADRB1 that causes familial natural short sleep phenotype via altered adrenergic signaling in sleep-wake circuitry.
A rare missense variant (p.Ala187Val) in the beta-1 adrenergic receptor gene ADRB1 linked to hereditary natural short sleep trait in humans.