MTNR1B rs1387153: Understanding Your Melatonin Receptor Variant
The rs1387153 variant is a common genetic change located near the MTNR1B gene, which encodes a receptor for the hormone melatonin. Research suggests this variant is associated with variations in fasting glucose levels and may influence how the body regulates circadian-related metabolic processes.
What each genotype means
Typical glucose regulation profile
This genotype represents the more common version of this variant. Research indicates that individuals with this profile do not carry the specific genetic association linked to altered fasting glucose levels or increased risk of gestational diabetes observed with the T allele. This is considered the baseline state for this genetic position.
Carried by approximately 49% of individuals in many European and Hispanic populations, based on a minor allele frequency of roughly 0.30.
Intermediate glucose regulation profile
Carrying one copy of the T allele has been associated in some studies with slight variations in fasting glucose levels and potential differences in insulin secretion. While some research suggests an association with an increased risk for gestational diabetes or type 2 diabetes, the evidence is mixed and often shows only a modest statistical effect. You should discuss your metabolic health and any concerns about glucose levels with your clinician.
Carried by approximately 42% of individuals in many European and Hispanic populations, based on a minor allele frequency of roughly 0.30.
Increased glucose sensitivity profile
Carrying two copies of the T allele is statistically associated with higher fasting glucose levels and potential changes in beta-cell function compared to those without the allele. Some studies have linked this genotype to a higher risk of developing gestational diabetes or type 2 diabetes, though these findings can vary by ancestry and study population. Please consult with your healthcare provider to monitor your metabolic health and discuss appropriate screening.
Carried by approximately 9% of individuals in many European and Hispanic populations, based on a minor allele frequency of roughly 0.30.
What is the rs1387153 Variant?
The rs1387153 variant is a single nucleotide polymorphism (SNP) located in the genomic region surrounding the MTNR1B gene on chromosome 11. In genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. This specific variant is categorized as an upstream variant, meaning it sits in the regulatory region of the gene rather than within the protein-coding sequence itself. Because it is located in a regulatory area, researchers investigate whether it influences how much of the MTNR1B protein is produced or when it is expressed in different tissues. It is considered a common variant, meaning it appears frequently across various human populations, and it has been identified through large-scale genome-wide association studies (GWAS) that look for links between specific DNA markers and physiological traits.
The Role of the MTNR1B Gene
The MTNR1B gene provides instructions for creating the melatonin receptor type 1B, a protein found primarily in the brain and the retina. This receptor is a G-protein coupled receptor, a type of cellular "switch" that helps transmit signals from outside the cell to the inside. Melatonin, often called the "hormone of darkness," is produced by the pineal gland and plays a critical role in regulating the body's internal clock, or circadian rhythm. By binding to receptors like MTNR1B, melatonin helps coordinate sleep-wake cycles and other light-dependent physiological functions. Beyond its role in sleep, the MTNR1B receptor is involved in metabolic processes, including the regulation of insulin secretion from the pancreas. Because of this, the gene is a subject of intense study regarding how circadian signaling might influence blood sugar levels and metabolic health.
Research Associations and Evidence
Scientific research has identified associations between variants in the MTNR1B region and metabolic traits, particularly fasting glucose levels. Large meta-analyses, such as those conducted by the Meta-Analyses of Glucose and Insulin-related traits Consortium (MAGIC), have highlighted that SNPs in this locus are statistically linked to small changes in blood glucose concentrations. While these associations are statistically significant in large population studies, the evidence is considered limited in terms of clinical predictability for an individual. The effect size of any single variant like rs1387153 on glucose levels is typically very small, and these traits are influenced by a complex interplay of many genetic factors, lifestyle choices, and environmental exposures. It is important to note that these findings are based on population-level data and do not indicate that an individual will develop a specific health condition based solely on their genotype.
Population Frequency
The rs1387153 variant is relatively common, with a minor allele frequency of approximately 0.30 in European and Hispanic populations. This means that a significant portion of the population carries at least one copy of the variant allele. Because it is a common variant, it is widely distributed across different ancestral groups, though exact frequencies can vary depending on the specific population studied. Genetic databases like gnomAD and dbSNP provide ongoing updates on these frequencies as more diverse genomic data becomes available. Understanding that this variant is common helps contextualize its role as a normal part of human genetic diversity rather than a rare mutation. Researchers continue to study how these frequencies differ globally to better understand the evolutionary history and potential functional impact of this specific genetic marker.
Interpreting Your Genetic Information
If you have received information about your rs1387153 genotype, it is helpful to view it as one small piece of a much larger biological puzzle. Genetic associations identified in research studies are meant to help scientists understand human biology and disease pathways, not to provide personal medical diagnoses. Because the influence of this variant on metabolic traits is subtle and influenced by many other factors, it cannot be used to predict your personal health outcomes or risk for conditions like type 2 diabetes. If you have concerns about your blood glucose levels, sleep patterns, or metabolic health, the most effective approach is to consult with a healthcare professional. They can evaluate your overall health, family history, and lifestyle to provide personalized guidance. Never use genetic information to make changes to your diet, exercise, or medication regimen without first discussing it with your doctor or a qualified pharmacist.
How common is this variant?
The rs1387153 variant is common, with a minor allele frequency of approximately 0.30 in European and Hispanic populations.
Frequently asked questions
Does rs1387153 mean I have diabetes?
No. This variant is associated with small, population-level differences in fasting glucose, but it is not a diagnostic marker for diabetes. Many factors, including diet, exercise, and other genes, play a much larger role in your metabolic health.
Can I change my genotype?
No, your genotype is determined at conception and remains the same throughout your life. However, you can influence how your genes are expressed through lifestyle choices like maintaining a healthy diet and consistent sleep schedule.
Should I take melatonin supplements if I have this variant?
Genetic variants do not provide specific instructions for supplement use. You should discuss any concerns about sleep or melatonin supplementation with your healthcare provider to ensure it is safe and appropriate for your specific health needs.
Where can I find more information about this SNP?
You can look up rs1387153 in public databases like the NCBI dbSNP or the GWAS Catalog. These resources provide technical details and links to the original research studies that identified the variant.
Sources & further reading
Educational information only, last refreshed 9/29/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant is associated with increased fasting blood glucose levels and risk of type 2 diabetes.
This variant in the melatonin receptor 1B gene is significantly associated with REM sleep latency and the duration of melatonin secretion.
Links melatonin signaling to higher fasting blood glucose levels.