HNF1A rs1169305: What Your Genotype Means
The rs1169305 variant is a genetic change located within the HNF1A gene. It has been studied for its statistical association with variations in high-sensitivity C-reactive protein (hs-CRP) levels and potential links to metabolic health markers.
What each genotype means
Baseline CRP and metabolic traits
You carry two copies of the reference A allele (coding for isoleucine at position 27). In population studies, this genotype is considered the baseline profile and is not associated with the alterations in hepatic high-sensitivity C-reactive protein (hs-CRP) transcription or the modest shifts in glycemic parameters observed with the variant allele. Because this is a common benign background variant, it does not imply a monogenic diagnosis or mandate any alteration to standard health screenings.
Found in approximately 35% to 50% of individuals globally, making it one of the most common genotypes across most ancestries.
Modest hs-CRP and glycemic variation
You carry one copy of the C allele (p.Ile27Leu), which is a common benign missense variant. Research indicates that the C allele is modestly associated with differences in circulating high-sensitivity C-reactive protein (hs-CRP) levels and slight population-level variations in metabolic traits. Although ClinVar classifies this variant as benign, evidence regarding its role in modifying diabetes risk or age of onset remains limited and should not be used for diagnosis or standalone medical decisions.
Carried by approximately 40% to 50% of individuals in European and global populations.
Altered hs-CRP and metabolic predisposition
You carry two copies of the C allele (p.Ile27Leu). In epidemiological studies, homozygous carriers often show the most pronounced shifts in hepatic transcription of high-sensitivity C-reactive protein (hs-CRP) and have demonstrated weak associations with early metabolic variation in some cohorts. These findings represent subtle polygenic or biomarker influences rather than a diagnostic cause of diabetes, so ongoing wellness and metabolic health should follow standard clinical guidelines.
Observed in roughly 10% to 16% of individuals across European, Asian, and other global populations.
Understanding the rs1169305 Variant
The rs1169305 variant is a single nucleotide polymorphism (SNP) situated within the HNF1A gene, which provides instructions for making the hepatocyte nuclear factor-1 alpha protein. In genetic research, SNPs are common variations where a single building block of DNA, known as a nucleotide, differs between individuals. This specific variant is categorized as a missense change, meaning the alteration in the DNA sequence results in a different amino acid being incorporated into the protein structure. Specifically, this variant is often discussed in the context of the p.Ile27Leu change. Researchers track these variations to understand how they might influence biological processes, such as the regulation of proteins in the blood or metabolic pathways. It is important to note that the presence of a specific SNP does not determine a health outcome on its own, but rather contributes to the complex, polygenic landscape of human biology.
The Role of the HNF1A Gene
The HNF1A gene encodes a transcription factor called hepatocyte nuclear factor-1 alpha. Transcription factors are proteins that bind to specific regions of DNA to help control the activity of other genes. HNF1A is primarily active in the liver, but it also plays a critical role in the pancreas, kidneys, and intestines. By regulating the expression of various genes, HNF1A helps manage processes such as glucose metabolism, insulin secretion, and the production of certain proteins in the blood. Because of its central role in these metabolic pathways, variations in the HNF1A gene have been the subject of extensive scientific investigation. Understanding how this gene functions provides context for why researchers look for associations between its variants and biomarkers like C-reactive protein, which is a common indicator of inflammation in the body.
Research Associations and Evidence Strength
Scientific research, including genome-wide association studies (GWAS), has identified links between common variants in the HNF1A gene and plasma levels of C-reactive protein (CRP). CRP is a protein produced by the liver in response to inflammation. Studies have observed that certain HNF1A variants are statistically associated with lower or higher concentrations of this protein in the blood. However, the evidence for the specific clinical impact of rs1169305 remains limited. While these associations are statistically significant in large population studies, they do not necessarily imply a direct causal relationship or a specific disease state. The genetic architecture of traits like CRP levels is highly complex, involving many genes and environmental factors. Consequently, while rs1169305 is a recognized marker in genetic databases, it is not currently used as a standalone diagnostic tool for clinical decision-making.
Interpreting Your Genetic Information
If you have received information about your rs1169305 genotype, it is helpful to view it as a small piece of a much larger biological puzzle. Genetic associations are based on population-level data and cannot predict individual health outcomes. Factors such as diet, physical activity, age, and overall medical history play a much larger role in determining your metabolic health and inflammation levels than any single SNP. You cannot use this information to diagnose yourself or to make changes to prescribed medications. If you are concerned about your CRP levels or metabolic health, the most appropriate step is to consult with a healthcare professional. They can interpret your results in the context of your complete medical profile and provide guidance based on established clinical standards rather than isolated genetic markers.
How common is this variant?
The rs1169305 variant is common, with a minor allele frequency (MAF) typically ranging between 0.30 and 0.40 across various global populations.
Frequently asked questions
Is rs1169305 a cause of disease?
No, rs1169305 is a genetic variant associated with variations in biomarkers like C-reactive protein, not a direct cause of disease. Genetic associations reflect statistical trends in populations rather than individual medical diagnoses.
Should I change my diet based on this SNP?
There is no evidence to suggest that you should alter your diet based on this specific genetic variant. Decisions regarding diet and lifestyle should be made in consultation with a doctor or a registered dietitian based on your overall health status.
Can this variant predict my risk of heart disease?
While some HNF1A variants are studied in the context of cardiovascular markers, this SNP is not a clinical predictor of heart disease. Cardiovascular risk is determined by a combination of many genetic, environmental, and lifestyle factors.
Where can I find more information about my specific genotype?
You can search for the rsID on public databases like the NCBI dbSNP or the GWAS Catalog. These resources provide summaries of published research regarding the variant's associations.
Sources & further reading
Educational information only, last refreshed 10/19/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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A rare variant in the HNF1A gene associated with maturity-onset diabetes of the young type 3 (MODY3).
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.