MEIS1 rs12927184: Genetic Link to Restless Legs Syndrome
The rs12927184 polymorphism is a non-coding, intronic single nucleotide variant situated within the MEIS1 gene on human chromosome 2. Large-scale genome-wide association studies have identified this locus as being statistically associated with restless legs syndrome and disrupted sleep architecture. While carrying the risk allele correlates with higher odds of these traits in population studies, it represents a predisposing factor rather than a deterministic cause.
What each genotype means
Typical baseline risk
You carry two copies of the common MEIS1 reference allele associated with typical baseline risk. In large genetic association studies, this genotype has not been linked to increased vulnerability to restless legs syndrome or related sleep disruptions. It reflects the standard population background profile for this locus.
Carried by approximately 30% to 40% of individuals of European ancestry and is the predominant genotype across East Asian populations.
Modestly increased RLS risk
You carry one copy of the MEIS1 risk allele linked to altered intronic regulation. Population-based research observes a modest statistical increase in the likelihood of experiencing restless legs syndrome and minor variations in sleep architecture. Having this variant does not cause the condition or diagnose any disorder.
Carried by approximately 45% to 50% of individuals of European ancestry and is less frequent in African and Asian populations.
Higher relative RLS risk
You carry two copies of the MEIS1 risk allele associated with restless legs syndrome. Genome-wide association studies show an elevated statistical predisposition to restless legs symptoms and disrupted nocturnal sleep compared to the general population. Because complex traits involve many environmental and genetic contributors, carrying this genotype alone is not diagnostic.
Carried by roughly 12% to 20% of people of European ancestry and is relatively uncommon in East Asian ancestries.
Genetic Architecture and Genomic Location
The single nucleotide polymorphism rs12927184 is located on chromosome 2 within an intronic region of the MEIS1 gene. Because it lies within a non-coding intron rather than an exon, it does not alter the primary amino acid sequence of the resulting protein. Instead, variants in this region often reside within evolutionary conserved non-coding regulatory sequences, such as enhancers, that can modulate the transcription and expression levels of the MEIS1 transcript across various neural and developmental tissues. MEIS1 sits in a haplotype block known to harbor multiple variants in high linkage disequilibrium that collectively associate with sensorimotor and sleep phenotypes.
Biological Role of the MEIS1 Gene
The MEIS1 gene encodes Meis homeobox 1, a homeodomain-containing transcription factor essential for embryonic development, pattern formation, and hematopoiesis. In the central nervous system, MEIS1 coordinates complex regulatory networks and interacts with cofactor proteins to guide limb development and neuronal differentiation. Additionally, laboratory and translational research models have linked MEIS1 function to central iron homeostasis. Because central nervous system iron insufficiency is an established physiological hallmark of restless legs syndrome, disruption of MEIS1 expression through non-coding regulatory changes is thought to contribute to altered neural function and involuntary limb movements during periods of rest.
Strength of Scientific Evidence and Trait Associations
Genome-wide association studies have consistently identified the MEIS1 genomic locus as among the most statistically significant genetic regions associated with restless legs syndrome (RLS) susceptibility and related sleep disruptions. While the overall MEIS1 locus demonstrates robust genome-wide significance, individual tagging variants like rs12927184 possess limited direct functional validation on their own due to tight correlation with other neighboring markers. Furthermore, restless legs syndrome is a complex, polygenic trait where no single genetic variant is deterministic. Environmental factors, dietary iron levels, metabolic conditions, and general health status all strongly modulate clinical presentation.
Interpreting Genetic Results in Daily Life
Learning your rs12927184 genotype provides an educational glimpse into your underlying genetic architecture, but it is not a medical diagnosis. Carrying one or two risk alleles does not mean you will develop restless legs syndrome, nor does carrying protective alleles guarantee that you will never experience sleep disturbances. Genotype information from consumer platforms should never be used to initiate, discontinue, or adjust prescription treatments or nutritional supplements. If you experience uncomfortable sensations in your legs, uncontrollable urges to move while resting, or chronic insomnia, you should seek a comprehensive clinical assessment from a qualified healthcare professional.
How common is this variant?
The risk allele for rs12927184 is common in people of European ancestry, showing an estimated frequency of approximately 0.35 to 0.45 across Western European reference populations, while frequencies vary across other continental ancestries.
Frequently asked questions
What is the rs12927184 variant?
The rs12927184 variant is an intronic single nucleotide polymorphism located in the MEIS1 gene on chromosome 2. It has been examined in genetic research for its association with restless legs syndrome and patterns of disrupted sleep.
Does having the rs12927184 risk allele mean I will get restless legs syndrome?
No, it does not. Restless legs syndrome is a complex condition influenced by numerous genetic variants as well as lifestyle, iron levels, and other environmental factors. The variant only slightly shifts statistical risk in populations.
Can I use my rs12927184 result to guide iron supplementation?
No, you should never start or change iron supplements based on a genetic variant. Iron supplementation should only be guided by formal blood tests, such as serum ferritin levels, and under the direct supervision of a healthcare provider.
Why are non-coding variants in MEIS1 important?
Although intronic variants do not alter the protein sequence directly, they frequently reside within regulatory regions like enhancers. These sequences can influence how much MEIS1 protein is produced, impacting biological pathways such as neuronal function and iron regulation.
Sources & further reading
Educational information only, last refreshed 9/13/2026. 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.