MAD1L1 rs111595851: Understanding Your Genetic Sleep Association
The genetic variant rs111595851 is a common single-nucleotide polymorphism located near the MAD1L1 gene. Large-scale genome-wide association studies have identified this locus as a significant marker associated with habitual short sleep duration in human populations.
What each genotype means
Typical habitual sleep duration
You carry two copies of the common C allele for this variant near the MAD1L1 gene. Large-scale genome-wide association studies have linked this baseline genotype with typical, average sleep patterns rather than an increased predisposition toward habitual short sleep duration. However, sleep length is a complex polygenic trait influenced by numerous genetic loci as well as environmental factors and lifestyle habits.
Carried by approximately 84% to 85% of individuals of European ancestry and the majority of individuals in other continental populations.
Mild short sleep predisposition
You carry one copy of the T effect allele at rs111595851 near MAD1L1. In large multi-cohort genome-wide association studies, this allele is moderately associated with an increased statistical likelihood of reporting habitual short sleep duration (six hours or less per night). Because sleep duration is influenced by dozens of genes together with lifestyle and sleep hygiene, carrying this allele confers only a modest statistical shift.
Carried by approximately 14% to 15% of individuals of European ancestry, with lower frequencies generally observed in East Asian and African ancestry groups.
Elevated short sleep predisposition
You carry two copies of the T effect allele at rs111595851 near MAD1L1. In cross-biobank genome-wide association studies, this genotype shows the strongest statistical association at this locus with a tendency toward habitual short sleep duration. While this variant contributes incrementally to sleep length patterns, actual sleep duration remains largely governed by cumulative polygenic background and environmental factors.
Carried by less than 1% of individuals of European ancestry and is similarly rare in other major ancestral populations.
What is rs111595851?
The variant rs111595851 is a specific change in the DNA sequence, categorized as a single-nucleotide polymorphism (SNP). It is situated on chromosome 7, in the genomic region associated with the MAD1L1 gene. In genetic research, SNPs like rs111595851 serve as signposts that help scientists identify areas of the genome that may influence complex human traits. This particular variant has been highlighted in cross-biobank analyses, which aggregate genetic and health data from hundreds of thousands of individuals to find statistical links between specific DNA locations and observable characteristics. Because it is a common variant, it is found frequently across diverse ancestral groups, making it a subject of interest for researchers studying the genetic architecture of sleep patterns.
The Role of the MAD1L1 Gene
The MAD1L1 gene, or Mitotic Arrest Deficient 1-Like 1, encodes a protein that plays a critical role in the cell cycle. Specifically, it is a key component of the spindle-assembly checkpoint, a biological mechanism that ensures chromosomes are correctly aligned before a cell divides. By preventing the onset of anaphase until alignment is complete, the MAD1L1 protein helps maintain genomic stability. While its primary function is related to cell division and tumor suppression, researchers have also investigated its expression in the brain. The connection between this gene and sleep duration is an area of active study, as the biological pathways regulating the cell cycle and those governing circadian rhythms or sleep homeostasis may overlap in ways that are not yet fully understood.
Research and Sleep Associations
Evidence linking rs111595851 to sleep duration is considered strong within the context of genome-wide association studies (GWAS). Research published in journals such as Nature Communications has identified this locus as one of many independent risk loci associated with habitual short sleep duration. These studies compare the genetic profiles of individuals who report sleeping for shorter periods against those with normal sleep durations. While the statistical association is robust, it is important to note that sleep duration is a complex, polygenic trait. This means it is influenced by hundreds of small genetic variations, as well as environmental and lifestyle factors. The presence of this variant does not determine an individual's sleep habits, but rather contributes to the overall genetic predisposition observed in large population-level data.
Interpreting Your Genetic Information
Understanding your genotype for rs111595851 provides insight into your genetic makeup, but it cannot be used to diagnose sleep disorders or predict your personal sleep needs. Because sleep is influenced by a wide array of genetic and environmental factors, a single SNP provides only a tiny fraction of the picture. You cannot use this information to make medical decisions or change your health habits without professional guidance. If you have concerns about your sleep quality, duration, or overall health, it is essential to consult with a healthcare provider or a sleep specialist. They can evaluate your symptoms, medical history, and lifestyle to provide personalized advice. Genetic data should be viewed as a tool for scientific curiosity rather than a definitive guide for clinical health management.
How common is this variant?
The rs111595851 variant is considered common, meaning it appears at a high frequency across various global ancestral populations.
Frequently asked questions
Does having this variant mean I will have short sleep?
No. Genetic associations identify statistical trends across large groups of people, not individual outcomes. Many factors, including environment and lifestyle, play a much larger role in determining your actual sleep duration.
Can I use this information to diagnose a sleep disorder?
No. Genetic variants like rs111595851 are not diagnostic tools. If you are experiencing sleep issues, you should speak with a doctor to discuss your symptoms and potential clinical evaluations.
Is MAD1L1 only related to sleep?
No. The MAD1L1 gene is primarily known for its role in the mitotic spindle-assembly checkpoint, which is essential for cell division. Its association with sleep is a separate area of research.
Should I change my sleep habits based on my genotype?
No. You should not alter your health habits based on a single genetic variant. Always consult with a healthcare professional before making significant changes to your health or sleep routine.
Sources & further reading
Educational information only, last refreshed 10/27/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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