HNF1A rs774945535: Understanding This Rare Genetic Variant
The rs774945535 variant is a rare genetic change located within the HNF1A gene. It has been investigated for its potential role in maturity-onset diabetes of the young (MODY3), a condition characterized by impaired insulin secretion and altered glucose homeostasis.
What each genotype means
Typical HNF1A profile
This genotype represents the most common sequence found in the HNF1A gene. It is not associated with the specific genetic changes linked to maturity-onset diabetes of the young (MODY3).
This is the most common genotype observed across all global populations.
Potential HNF1A variant carrier
This genotype indicates the presence of the rs774945535 variant on one chromosome. While HNF1A variants are implicated in MODY3, which affects insulin secretion and glucose homeostasis, the clinical significance of this specific rare variant remains limited and requires professional clinical correlation. Please discuss these results with a healthcare provider or genetic counselor to understand if this finding is relevant to your personal health history.
This genotype is rare and is not frequently observed in large-scale population databases.
Rare HNF1A variant homozygous
This genotype indicates the presence of the rs774945535 variant on both chromosomes. Because this variant is rare and evidence regarding its specific impact on glucose metabolism is limited, its clinical implications are not fully established. You should consult with a medical professional to determine if this finding warrants further clinical investigation or metabolic screening.
This genotype is extremely rare and is not typically found in general population cohorts.
What is the rs774945535 Variant?
The rs774945535 variant is a specific change in the DNA sequence of the HNF1A gene. In genomics, a single nucleotide polymorphism (SNP) like this represents a variation at a single position in the genome. This particular variant is categorized as rare, meaning it is found in a very small percentage of the general population. Because it sits within the HNF1A gene, researchers study it to determine if it alters the protein's structure or function. When a variant occurs in a gene responsible for critical metabolic processes, scientists look for statistical associations between the presence of the variant and specific health traits, such as how the body manages blood sugar levels. Currently, the evidence linking this specific variant to clinical outcomes is considered limited, requiring further study to fully understand its biological impact.
The Role of the HNF1A Gene
The HNF1A gene provides instructions for making a protein called hepatocyte nuclear factor-1 alpha. This protein acts as a transcription factor, which means it binds to specific regions of DNA to help control the activity of other genes. HNF1A is highly active in the pancreas, where it plays a vital role in the development and function of beta cells. Beta cells are responsible for producing and releasing insulin, the hormone that regulates blood glucose levels. Beyond the pancreas, HNF1A is also expressed in the liver, kidneys, and intestines, where it helps regulate various metabolic pathways. Because of its central role in insulin production, variants that disrupt HNF1A function can lead to reduced insulin secretion. This is the primary mechanism behind HNF1A-MODY, a form of monogenic diabetes that typically presents in adolescence or early adulthood.
Research and Evidence Strength
Research into HNF1A variants has evolved significantly. While certain pathogenic mutations in HNF1A are well-established causes of MODY3, many other variants, including rare ones like rs774945535, have less clear clinical significance. Current scientific literature emphasizes that not all variants in this gene lead to disease. Some variants may have no effect, while others might even confer protective benefits against certain metabolic conditions. The evidence for rs774945535 is currently classified as limited, meaning that while it has been identified in the context of diabetes research, there is not yet a consensus on its exact functional impact or its ability to cause disease on its own. Large-scale population studies are essential to distinguish between variants that are truly causative and those that are benign or have only a minor influence on glucose homeostasis.
What This Information Means for You
If you have encountered this variant in a genetic report, it is important to understand that genetic data is only one piece of a complex health puzzle. The presence of a rare variant does not automatically imply a diagnosis or a specific health outcome. Many factors, including your overall genetic background, lifestyle, and environment, influence how your body regulates glucose. Because the evidence for rs774945535 is limited, it should not be used to make medical decisions or predict future health status. If you are concerned about your blood sugar levels or a family history of diabetes, the most effective step is to consult with a healthcare professional or a genetic counselor. They can provide context based on your personal medical history and clinical testing, which are far more reliable than individual SNP data for assessing your health.
How common is this variant?
The rs774945535 variant is considered rare in the general population, appearing at a very low frequency across most ancestral groups.
Frequently asked questions
Is rs774945535 a cause of diabetes?
The evidence linking rs774945535 to diabetes is currently limited. While HNF1A variants can be associated with MODY3, not every variant in this gene is pathogenic.
Should I be worried if I have this variant?
No. Genetic variants are common, and many have no impact on your health. You should discuss any concerns about your health or family history with a doctor.
Can I use this information to change my diet?
Genetic information should not be used to make medical or dietary changes without professional guidance. Always consult a registered dietitian or physician for personalized health advice.
Where can I learn more about HNF1A?
You can find reliable information on the HNF1A gene through resources like MedlinePlus Genetics or the National Center for Biotechnology Information (NCBI).
Sources & further reading
Educational information only, last refreshed 10/4/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Associated with variation in circulating high-sensitivity C-reactive protein (hsCRP) levels and glycemic traits.
A common missense variant (p.Ile27Leu) in HNF1A associated with modest alterations in high-sensitivity C-reactive protein levels and susceptibility to dysregulated glucose homeostasis.
Missense change (p.Ile27Leu) in HNF1A linked to variability in high-sensitivity C-reactive protein levels and predisposition to metabolic alterations.