HCRTR2 rs114138760: Understanding This Genetic Variant
The rs114138760 variant is located within the HCRTR2 gene, which encodes a receptor involved in the hypocretin/orexin system. While historically studied for potential links to cluster headache susceptibility, current scientific evidence remains limited and inconsistent regarding its clinical impact.
What each genotype means
Typical hypocretin receptor function
You carry two copies of the common C allele in the HCRTR2 gene. This baseline genotype is not associated with the increased susceptibility to cluster headaches or altered daytime somnolence patterns identified in preliminary studies of the minor variant. Because evidence linking this locus to headache disorders and sleep regulation remains limited and inconsistent across different cohorts, having this typical genotype represents standard population risk.
Carried by approximately 92% of individuals of European ancestry and is the predominant genotype across global populations.
Modestly altered receptor profile
You carry one copy of the less common T allele in the HCRTR2 gene. Early candidate gene studies have explored this hypocretin/orexin receptor variant in connection with cluster headache susceptibility and daytime sleepiness regulation, but overall evidence is limited and findings have not been uniformly replicated across independent populations. Carrying a single copy of this variant indicates only a modest statistical association rather than a clinical diagnosis or certainty of symptoms.
Carried by approximately 7% to 8% of individuals of European ancestry; it occurs at substantially lower frequencies in East Asian and African ancestries.
Atypical hypocretin receptor genotype
You carry two copies of the rare T allele in the HCRTR2 gene. While some research has suggested that variation at this hypocretin/orexin locus may correlate with altered sleepiness regulation or a modified risk profile for neurovascular conditions such as cluster headaches, evidence across studies remains limited and mixed. Having this genotype does not cause headaches or daytime somnolence on its own, and any treatment or diagnostic evaluations should always be guided by clinical presentation with your healthcare provider.
Carried by fewer than 1 in 500 individuals of European descent (~0.2%) and is exceptionally rare in non-European ancestries.
What is rs114138760?
The rs114138760 variant is a single nucleotide polymorphism (SNP) situated within the HCRTR2 gene. In genomics, a SNP represents a variation at a single position in a DNA sequence among individuals. This specific variant is cataloged in public databases like dbSNP, which track genetic variations across human populations. Because it is located within a gene that plays a role in neurological signaling, researchers have investigated whether this specific change in the DNA code might influence how the body regulates certain physiological processes. However, the presence of a variant does not automatically imply a functional change in the protein produced by the gene. Geneticists often study such variants to determine if they correlate with specific health traits or conditions, but identifying a statistical association is only the first step in a long process of biological validation.
The Role of the HCRTR2 Gene
The HCRTR2 gene provides instructions for creating the hypocretin receptor 2 protein. This receptor is a critical component of the hypocretin (also known as orexin) system, which is primarily expressed in the hypothalamus of the brain. This system is essential for regulating the sleep-wake cycle, energy balance, and arousal. By binding to hypocretin neuropeptides, the receptor helps maintain wakefulness and modulates various autonomic functions. Because of its central role in these regulatory pathways, the HCRTR2 gene has been a frequent candidate for studies investigating disorders related to sleep, circadian rhythms, and pain modulation. When a variant occurs in this gene, researchers hypothesize that it might subtly alter the receptor's function or expression levels, potentially impacting how the brain processes signals related to pain or sleep stability.
Evidence and Research Associations
Research into HCRTR2 variants, including those related to cluster headache, has produced mixed results. While some early candidate gene studies suggested that certain polymorphisms in HCRTR2 might be associated with an increased risk of cluster headache, subsequent large-scale meta-analyses and independent replication studies have often failed to confirm these findings. The evidence for rs114138760 specifically is considered limited. In the context of complex, multi-factorial conditions like cluster headache, it is common for initial reports of genetic associations to be difficult to replicate across different populations. This inconsistency often arises from differences in study design, sample sizes, and the genetic background of the participants. Consequently, the scientific community generally views the link between this specific variant and clinical outcomes as inconclusive, requiring further rigorous investigation before any definitive conclusions can be drawn.
Population Frequency
The rs114138760 variant has a minor allele frequency (MAF) of approximately 0.04 in European populations. This means that the variant is relatively uncommon but present in a significant portion of the population. Genetic frequencies can vary substantially across different ancestral groups, and it is important to note that a frequency observed in one population may not be representative of others. Because the prevalence of this variant is low, large sample sizes are required to achieve the statistical power necessary to detect potential associations with health traits. The current data reflects the frequency observed in available genomic databases, which are heavily weighted toward certain ancestral backgrounds, highlighting the need for more diverse genetic research to fully understand the distribution and potential impact of this variant globally.
Interpreting Your Genetic Information
It is important to understand that having a specific genotype for rs114138760 does not constitute a medical diagnosis. Genetic variants are only one of many factors—including environment, lifestyle, and other genetic influences—that contribute to an individual's health. Because the evidence linking this variant to specific clinical outcomes is limited and inconsistent, this information should not be used to predict disease risk or guide medical decisions. If you have concerns about your health, such as recurring headaches or sleep issues, you should consult with a qualified healthcare professional. They can provide a comprehensive evaluation based on your clinical history and symptoms. Never make changes to your medication or treatment plan based on genetic test results without first discussing them with your doctor or pharmacist, as they are best equipped to interpret how your unique genetic profile fits into your overall health picture.
How common is this variant?
The variant has a minor allele frequency of approximately 0.04 in European populations, indicating it is relatively uncommon.
Frequently asked questions
Is rs114138760 a cause of cluster headache?
No. While some HCRTR2 variants have been studied in relation to cluster headache, the evidence for this specific variant is limited and inconsistent. It is not considered a direct cause of the condition.
Should I be worried if I have the variant allele?
No. Genetic variants are common and often have no significant impact on your health. This variant is not a diagnostic marker for any disease.
Can I use this information to change my medication?
No. You should never change your medication or treatment plan based on genetic information. Always consult your doctor or pharmacist regarding any changes to your medical care.
Where can I find more information about HCRTR2?
You can search resources like MedlinePlus Genetics or the NCBI Gene database for general information about the HCRTR2 gene. These sites provide reliable, peer-reviewed summaries of gene functions.
Sources & further reading
Educational information only, last refreshed 10/24/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Non-synonymous variant (Val308Ile) in hypocretin/orexin receptor type 2 implicated in daytime somnolence and altered sleep architecture.
Hypocretin/orexin receptor 2 regulatory variant linked to excessive daytime sleepiness and disrupted REM sleep stabilization.
Variant in HCRTR2 associated with sleep architecture and daytime sleepiness.