rs6966836: Understanding Genetic Associations with Cluster Headache
The genetic variant rs6966836 is an intergenic single nucleotide polymorphism (SNP) located on chromosome 7. It has been identified through large-scale genome-wide association studies (GWAS) as being significantly associated with an increased risk of developing cluster headache.
What each genotype means
Baseline cluster headache risk
This genotype represents the baseline state for this genetic location. Research indicates that individuals carrying the C allele at this position have a statistically lower association with cluster headache compared to those carrying the T allele. This finding is based on large-scale genome-wide association studies, but it is important to remember that complex conditions like cluster headache are influenced by many genetic and environmental factors.
The C allele is the major allele at this position, making the CC genotype relatively common in populations of European ancestry.
Slightly increased headache risk
Carrying one copy of the T allele is associated with a modest increase in the statistical risk of developing cluster headache. This association was identified in large-scale genome-wide association studies, which observed an odds ratio of approximately 1.25 for the risk allele. This result is primarily based on European cohorts, and its applicability to other ancestral groups remains to be fully established.
This heterozygous genotype is found in a significant portion of the population, though exact frequencies vary by specific ancestral background.
Elevated cluster headache risk
Individuals with this genotype carry two copies of the T allele, which has been identified as a risk variant for cluster headache in genome-wide association studies. While this genotype is statistically associated with an increased risk of the condition, it does not mean that an individual will develop cluster headache, as the disorder is multifactorial. These findings are based on research involving European discovery samples and may not be representative of all global populations.
The TT genotype is less common than the CC or CT genotypes in most studied populations of European ancestry.
What is rs6966836?
The variant rs6966836 is a single nucleotide polymorphism, or SNP, which is a variation at a single position in the DNA sequence. This specific SNP is classified as intergenic, meaning it is located in the non-coding regions of the genome that lie between genes. Because it does not sit within a gene that codes for a protein, its exact biological function remains a subject of ongoing research. Scientists often use these intergenic variants as 'signposts' in the genome to help locate nearby regions that may influence disease susceptibility. In the case of rs6966836, its presence is statistically linked to the occurrence of cluster headache, a severe primary headache disorder characterized by intense, recurring attacks of pain.
Research and Evidence
The association between rs6966836 and cluster headache was established through genome-wide association studies (GWAS). These studies compare the DNA of individuals with a specific condition to those without it to identify genetic markers that appear more frequently in the affected group. Research has reported that rs6966836 reached genome-wide significance in discovery samples, with odds ratios indicating a moderate increase in the risk of cluster headache for carriers of the risk allele. While these findings are statistically significant, it is important to note that cluster headache is a complex condition likely influenced by many genetic and environmental factors. The evidence for this specific variant is considered moderate, and researchers continue to investigate how such variants might contribute to the underlying biological pathways of the disorder.
Population Frequency and Context
Genetic variants like rs6966836 are often studied within specific ancestral groups, primarily those of European descent in the context of current cluster headache research. The frequency of the risk allele can vary significantly across different global populations. Because GWAS results are often derived from specific cohorts, it is currently unclear to what extent these findings can be extrapolated to individuals of non-European ancestry. The scientific community emphasizes the need for larger, more diverse studies to better understand the global distribution of this variant and its impact on health across different populations. As with many complex traits, the presence of a risk allele does not guarantee the development of a condition, as genetic predisposition is only one piece of a much larger puzzle.
Interpreting Genetic Information
It is essential to understand that genetic associations identified in research studies are statistical observations, not medical diagnoses. Having a specific genotype at the rs6966836 locus does not mean an individual will develop cluster headache, nor does the absence of the variant guarantee protection. This information is intended for educational purposes to help the public understand the role of genetics in health. If you are concerned about symptoms of cluster headache or have questions about your health, you should consult with a qualified healthcare professional. Never use genetic data to make medical decisions or change treatments without the guidance of a clinician. Genetic research is an evolving field, and findings are frequently updated as new data becomes available.
How common is this variant?
The frequency of the rs6966836 alleles varies by ancestry, with current research primarily focusing on European cohorts where the risk allele has been identified as a significant marker for cluster headache susceptibility.
Frequently asked questions
Does having the rs6966836 variant mean I will get cluster headaches?
No. Genetic variants identified in GWAS are associated with a statistical increase in risk, not a certainty of disease. Many factors, including environment and other genes, contribute to the development of cluster headache.
Can I use this information to diagnose myself?
No. Genetic information should never be used for self-diagnosis. If you are experiencing severe headaches, please consult a neurologist or primary care physician for a proper clinical evaluation.
Is rs6966836 the only gene involved in cluster headache?
No. Cluster headache is a complex condition, and research has identified multiple genetic loci that may contribute to risk. It is likely that many different genes and variants play a role.
Where can I find more information about this SNP?
You can search for 'rs6966836' on the NCBI dbSNP database or the GWAS Catalog. These resources provide detailed, peer-reviewed data on genetic variants and their reported associations.
Sources & further reading
Educational information only, last refreshed 11/1/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs6966836?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29Related variants
This variant on chromosome 10 is a significant index variant associated with cluster headache susceptibility.
This missense variant (Asn141His) is associated with retinal thickness and foveal development, demonstrating a role in neural retina structure.
Variant in the estrogen receptor 1 locus associated with reproductive traits and susceptibility to idiopathic infertility.
Variant associated with sleep health traits and circadian regulation in large-scale genome-wide association studies.
Rare regulatory variant in the ESR1 locus implicated in the modulation of reproductive hormone responsiveness and fertility.
This variant has been linked to improved clinical outcomes and altered circadian regulation in specific pathologies.