MEIS1 rs12649500: What Your Genotype Means
The rs12649500 variant is a genetic marker located within the MEIS1 gene, which has been identified by researchers as a significant factor in the study of restless legs syndrome (RLS). This variant is situated in a non-coding, intronic region and is associated with the regulation of gene expression related to sleep and neurological health.
What each genotype means
Lower restless legs risk
This genotype is associated with a lower statistical likelihood of developing restless legs syndrome compared to those carrying the risk allele. While this variant is a well-studied marker for sleep-related traits, it is only one of many factors that influence your overall health. Please consult with a healthcare provider if you have concerns about sleep quality or limb movements.
This genotype is common in many populations, though the frequency of the risk allele varies significantly by ancestry.
Increased restless legs risk
Carrying one copy of this variant is associated with an increased statistical risk for restless legs syndrome and periodic limb movements during sleep. Research indicates this intronic variant may influence MEIS1 gene expression, which plays a role in neurological development. This association is based on population-level data and does not predict an individual diagnosis.
This heterozygous genotype is frequently observed, reflecting the high prevalence of the risk allele in European populations.
Higher restless legs risk
This genotype is associated with the highest statistical risk for restless legs syndrome and periodic limb movements during sleep within this variant's context. The MEIS1 locus is considered one of the strongest genetic predictors for these conditions in large-scale studies. If you experience symptoms such as an urge to move your legs, especially at night, discuss these findings with your clinician.
This genotype is common, with the risk allele appearing in approximately 48% of individuals of European ancestry.
Understanding the rs12649500 Variant
The rs12649500 variant is a single nucleotide polymorphism (SNP) located within the MEIS1 gene on chromosome 2. Specifically, it is an intronic variant, meaning it resides in a non-coding region of the gene that does not provide instructions for building a protein directly. Instead, intronic variants like rs12649500 are often involved in regulatory processes, acting as switches that influence how much of a specific protein is produced in different tissues. Because this variant is located in a highly conserved region of the genome, researchers have focused on it as a potential regulatory element that may impact the expression of the MEIS1 gene. By studying these non-coding regions, scientists aim to understand how subtle changes in DNA sequence can contribute to complex traits and neurological conditions, such as those affecting sleep patterns and limb movement.
The Role of the MEIS1 Gene
The MEIS1 gene, which stands for Myeloid Ecotropic Viral Integration Site 1, encodes a transcription factor that plays a critical role in normal embryonic development. Transcription factors are proteins that bind to specific DNA sequences to control the rate of gene transcription, effectively turning other genes on or off. Beyond its developmental functions, MEIS1 has been implicated in the regulation of iron homeostasis, a process essential for the proper functioning of the nervous system. Research has shown that reduced expression of MEIS1 can lead to changes in the levels of proteins involved in iron storage and transport, such as ferritin. Because iron deficiency is a well-known factor in the clinical presentation of restless legs syndrome, the link between MEIS1 expression and iron metabolism is a major area of investigation for understanding the biological pathways that may be disrupted in individuals with this condition.
Research Associations and Evidence Strength
Genome-wide association studies (GWAS) have consistently identified the MEIS1 locus as one of the most robust genetic risk factors for restless legs syndrome (RLS) and periodic limb movements during sleep (PLMS). The evidence for this association is strong, with multiple independent studies confirming that variants in and around the MEIS1 gene are linked to an increased risk of these conditions. However, while the statistical association is clear, the exact functional mechanism—how this specific variant alters the risk—remains a subject of ongoing research. Current evidence suggests that the risk-associated alleles may lead to decreased MEIS1 expression, which in turn affects neuronal development and iron regulation. It is important to note that while these genetic associations are statistically significant, they do not guarantee the development of a condition, as RLS is a complex disorder influenced by a combination of genetic, environmental, and lifestyle factors.
What You Can Do With This Information
Genetic information regarding variants like rs12649500 is primarily used for research and educational purposes to better understand the biological underpinnings of sleep disorders. It is crucial to understand that this information is not a medical diagnosis and cannot predict whether an individual will develop restless legs syndrome. If you are experiencing symptoms such as an uncomfortable urge to move your legs, especially at night, or if you have concerns about your sleep quality, you should consult a healthcare professional. A doctor can provide a proper clinical evaluation, which may include blood tests to check iron levels or a sleep study. Never use genetic data to make decisions about your health or to alter any prescribed medications without first discussing these steps with your clinician or pharmacist, who can provide guidance tailored to your specific medical history.
How common is this variant?
The risk allele for rs12649500 is relatively common, with a frequency of approximately 48% in European populations. Frequencies can vary significantly across different global ancestries.
Frequently asked questions
Is rs12649500 a diagnostic test for restless legs syndrome?
No, rs12649500 is not a diagnostic test. Restless legs syndrome is a clinical diagnosis made by a healthcare provider based on symptoms and medical history, not by genetic testing alone.
Does having the risk allele mean I will definitely get RLS?
No, having a risk allele does not mean you will develop the condition. Genetic risk factors only indicate a statistical predisposition, and many people with the risk allele never develop symptoms.
How does MEIS1 affect iron levels?
Research suggests that MEIS1 helps regulate genes involved in iron storage and transport. Reduced expression of MEIS1 has been linked to altered iron metabolism, which is a known factor in restless legs syndrome.
Can I change my genetic risk for RLS?
You cannot change your genetic sequence. However, managing environmental factors, such as maintaining healthy iron levels under medical supervision, is often part of the clinical approach to managing RLS symptoms.
Sources & further reading
Educational information only, last refreshed 9/24/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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A fine-mapped regulatory variant within the MEIS1 locus associated with restless legs syndrome and periodic limb movements during sleep.
This intronic regulatory variant in MEIS1 is a primary risk locus for restless legs syndrome, influencing gene expression in the developing telencephalon.
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.
A 3' UTR variant in MEIS1 associated with periodic limb movement in sleep, restless legs syndrome, and insomnia symptoms.
Non-coding regulatory variant in MEIS1 that is strongly associated with periodic limb movements during sleep and symptom severity in restless legs syndrome.