AQP4 rs162007: What Your Genotype Means
The rs162007 variant is a single-nucleotide polymorphism located within the AQP4 gene. Research has explored its potential role in cognitive performance and its interaction with sleep-related measures.
What each genotype means
Typical AQP4 expression
This genotype represents the major allele combination for this variant. Research suggests that individuals with this genotype may show different cognitive performance scores compared to those carrying the minor allele, particularly in studies of memory and attention. This variant is part of a larger genetic haplotype that may influence how the brain regulates sleep intensity and responds to sleep deprivation.
This is the most common genotype observed in most studied populations.
Associated with altered AQP4 expression
Carrying one copy of the minor allele (A) is associated with reduced AQP4 expression in certain tissues. Some studies indicate that carriers of this allele may demonstrate better performance on specific cognitive tests and potentially show enhanced sleep intensity during periods of sleep deprivation. These findings are based on statistical associations and should not be used to predict individual health outcomes.
This heterozygous genotype is found at moderate frequencies in many populations, though exact prevalence varies by ancestry.
Associated with reduced AQP4 expression
Individuals with this genotype carry two copies of the minor allele, which is linked to reduced AQP4 expression in pituitary tissue. Research suggests this genetic profile may be associated with differences in cognitive performance and how the brain manages sleep-related clearance processes. As these associations are based on population-level research, they do not provide a diagnostic assessment of your personal cognitive or sleep health.
This homozygous minor genotype is less common than the major allele homozygote in most populations.
Understanding the rs162007 Variant
The rs162007 variant is a specific genetic change, or single-nucleotide polymorphism (SNP), found within the AQP4 gene. Located on chromosome 18, this variant is categorized as an intronic variant, meaning it sits within a non-coding region of the gene. While it does not directly alter the protein sequence of the AQP4 channel, scientific databases like RegulomeDB have predicted it may have regulatory functions, potentially influencing how the gene is expressed or controlled within the body. Because it is located in a non-coding region, researchers often study it to see if it acts as a marker for broader genetic patterns or haplotypes that influence biological processes.
The Role of the AQP4 Gene
The AQP4 gene provides instructions for making the aquaporin-4 protein, which acts as a water channel in the brain. These channels are primarily found in the end-feet of astrocytes, a type of support cell in the central nervous system. Aquaporin-4 is essential for maintaining fluid balance and is a key component of the glymphatic system, a pathway that helps clear metabolic waste products from the brain. Because this clearance process is thought to be particularly active during sleep, the AQP4 gene has become a major focus for researchers investigating how sleep quality and brain health are connected. Variations in this gene are hypothesized to influence how efficiently the brain manages these waste-clearance tasks.
Research Associations and Evidence
Current research into rs162007 has yielded mixed but intriguing results. Some studies have observed a moderate association between this variant and cognitive performance, specifically in cross-sectional assessments like the AIBL PACC scores, where carriers of the minor allele have shown better performance compared to those with the major allele. Other research has investigated whether AQP4 variants, including rs162007, interact with sleep quality or sleep deprivation to influence brain health markers, such as amyloid-beta burden. However, it is important to note that the evidence is currently preliminary. While some studies suggest a link, others have found no significant association between this specific SNP and certain clinical conditions, such as fragile X-associated tremor/ataxia syndrome. Further longitudinal and interventional research is required to confirm these findings and understand their clinical relevance.
Population Frequency
The frequency of the rs162007 variant varies across different ancestral groups. In some studies, the minor allele frequency (MAF) has been reported at approximately 0.16, though comprehensive global data remains limited.
What This Information Means for You
Genetic information regarding variants like rs162007 is intended for educational purposes and should not be used for medical diagnosis or to guide personal health decisions. While research suggests potential links between AQP4 variants and cognitive or sleep-related traits, these associations are statistical in nature and do not predict individual outcomes. Many factors, including lifestyle, environment, and other genetic influences, contribute to brain health and sleep quality. If you have concerns about your sleep patterns, cognitive function, or neurological health, it is essential to consult with a qualified healthcare professional. They can provide personalized guidance based on your medical history and clinical symptoms, rather than relying on individual genetic markers.
How common is this variant?
The minor allele frequency for rs162007 is approximately 0.16 in some studied populations, though global frequency data is not fully established.
Frequently asked questions
Is rs162007 a diagnostic test for Alzheimer's disease?
No, rs162007 is not a diagnostic test. While researchers study AQP4 variants in the context of cognitive decline and amyloid burden, these findings are statistical associations and cannot be used to diagnose or predict Alzheimer's disease in an individual.
Does my AQP4 genotype mean I have a sleep disorder?
No. AQP4 variants are being studied for their potential role in sleep-related processes, but having a specific genotype does not mean you have a sleep disorder. Sleep health is complex and influenced by many factors beyond genetics.
Can I change my AQP4 gene expression?
You cannot change your genetic sequence. While some research explores how sleep quality might interact with AQP4, there is no established way to modify AQP4 gene expression through lifestyle changes based on this SNP.
Where can I find more information on AQP4 research?
You can search databases like PubMed or the GWAS Catalog for the latest peer-reviewed studies on AQP4. These resources provide access to the most current scientific literature regarding genetic associations.
Sources & further reading
Educational information only, last refreshed 10/30/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This AQP4 variant moderates the effect of sleep latency on brain amyloid-beta burden and has been linked to altered trajectories of cognitive decline.
This Aquaporin-4 variant is associated with poorer overall sleep quality and moderates the relationship between sleep duration and brain amyloid-beta burden.
This variant in the AQP4 gene moderates the association between sleep duration and brain amyloid-beta burden, where longer sleep duration is linked to higher amyloid levels in minor allele homozygotes.
This variant in the AQP4 gene is associated with the moderation of sleep latency effects on brain amyloid-beta and is implicated in cognitive decline trajectories.