MEIS1 rs4544423: What Your Genotype Means
The rs4544423 variant is a common genetic change located within the MEIS1 gene. Research has linked this specific site to variations in sleep patterns and traits, including associations with restless legs syndrome and sleep duration.
What each genotype means
Typical sleep duration profile
This genotype is associated with standard regulatory patterns for sleep duration within the MEIS1 gene. Research indicates that MEIS1 plays a role in balancing REM and NREM sleep phases, and this specific configuration represents the baseline often observed in population studies.
This is a common genotype found in many populations, with the G allele appearing frequently in global datasets.
Varied sleep duration association
Carrying one copy of the T allele at this position is associated with variations in REM sleep duration compared to the baseline. Because MEIS1 has opposing effects on REM and NREM sleep, this genotype may contribute to individual differences in how sleep architecture is regulated.
This heterozygous genotype is common, reflecting the high frequency of both G and T alleles in many European and global populations.
Distinct sleep duration association
This genotype is associated with measurable differences in REM sleep duration, as the MEIS1 gene is a known regulator of sleep architecture. While this variant is linked to sleep traits, it is important to note that sleep patterns are complex and influenced by many genetic and environmental factors.
This genotype is observed at a significant frequency in European populations, consistent with the reported global minor allele frequency for this variant.
Understanding the rs4544423 Variant
The rs4544423 variant is a single nucleotide polymorphism (SNP) located on chromosome 2 within the MEIS1 gene. In genetics, a SNP represents a variation at a single position in the DNA sequence. This particular variant is situated in an intronic region, meaning it lies within a non-coding part of the gene that does not directly provide instructions for building a protein. However, non-coding regions often play critical roles in regulating how genes are turned on or off. Because rs4544423 is located in a region associated with gene regulation, researchers study it to understand how it might influence the expression levels of the MEIS1 gene, which is known to be involved in various developmental and physiological processes.
The Role of the MEIS1 Gene
The MEIS1 gene, which stands for Meis homeobox 1, encodes a transcription factor—a protein that helps control the activity of other genes. MEIS1 is widely recognized for its role in embryonic development, particularly in the formation of the heart and blood cells. Beyond development, recent scientific interest has focused on its function in the adult nervous system. Studies suggest that MEIS1 is involved in regulating sleep architecture and maintenance. Research using animal models, such as zebrafish, has indicated that the ortholog of this gene is essential for maintaining normal sleep patterns. Disruptions in these pathways are thought to contribute to sleep-related conditions, making MEIS1 a significant subject of study in sleep medicine and neurobiology.
Research Associations and Evidence
The evidence linking rs4544423 and the broader MEIS1 locus to sleep traits is considered moderate. Large-scale genome-wide association studies (GWAS) have consistently identified the MEIS1 region as a genetic hotspot for restless legs syndrome (RLS) and insomnia complaints. While rs4544423 is frequently cited in the context of these studies, it is important to note that many GWAS findings identify regions of interest rather than a single causal mutation. The association between this variant and sleep duration is supported by statistical correlations observed in large populations. However, the biological mechanism—how exactly this specific intronic change alters sleep behavior—remains an active area of investigation. Current research emphasizes that while the statistical link is robust, the variant is one of many factors that influence complex sleep traits.
Population Frequency
The rs4544423 variant is common in European populations. Because it is a common variant, a significant portion of the population carries at least one copy of the minor allele. Frequency data can vary between different ancestral groups, and researchers often look at these differences to better understand the evolutionary history and distribution of the variant across the globe.
Interpreting Your Genetic Information
It is important to understand that genetic variants like rs4544423 provide only a small piece of the puzzle regarding your health. Sleep patterns are complex, influenced by a combination of genetics, environment, lifestyle, and overall health status. Having a specific genotype at this location does not mean you will develop a sleep disorder, nor does it guarantee a specific sleep duration. This information is intended for educational purposes and should not be used to diagnose or treat any medical condition. If you have concerns about your sleep quality, duration, or symptoms such as restless legs, you should consult with a healthcare professional or a sleep specialist. They can provide a comprehensive evaluation based on your clinical history rather than relying on genetic data alone.
How common is this variant?
The rs4544423 variant is common in European populations, with the minor allele appearing at a frequency that makes it a standard subject for genetic association studies.
Frequently asked questions
Is rs4544423 a cause of insomnia?
No, rs4544423 is not a direct cause of insomnia. It is a genetic marker associated with an increased statistical risk for sleep complaints, but many other factors, including environment and other genes, contribute to sleep health.
Can I use this SNP to predict my sleep quality?
No, you cannot use this SNP to predict your sleep quality. Sleep is a complex trait influenced by many variables, and genetic markers like this one only show small statistical associations in large groups of people.
What should I do if I have the risk allele for this variant?
You do not need to take any specific action based on this genotype. If you are experiencing sleep issues, you should discuss your symptoms with a doctor or sleep specialist to determine the best course of action.
Is MEIS1 only involved in sleep?
No, the MEIS1 gene has several functions. It is well-known for its role in embryonic development, particularly in the formation of blood cells and the heart, in addition to its role in the nervous system.
Sources & further reading
Educational information only, last refreshed 9/22/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This intronic regulatory variant in MEIS1 is a primary risk locus for restless legs syndrome, influencing gene expression in the developing telencephalon.
A fine-mapped regulatory variant within the MEIS1 locus associated with restless legs syndrome and periodic limb movements during sleep.
This intronic variant in the MEIS1 gene is one of the most robustly replicated genetic risk factors for restless legs syndrome (RLS) and periodic limb movements of sleep.
Intronic SNP strongly predisposing individuals to Restless Legs Syndrome and periodic limb movements during sleep.
Intronic regulatory variant within MEIS1 strongly implicated in periodic limb movements during sleep and restless legs syndrome etiology.
A 3' UTR variant in MEIS1 associated with periodic limb movement in sleep, restless legs syndrome, and insomnia symptoms.