FADS1 rs174547: What Your Genotype Means
The rs174547 variant is a single-nucleotide polymorphism located within the FADS1 gene. It is associated with variations in how efficiently the body converts plant-based fats into essential long-chain polyunsaturated fatty acids.
What each genotype means
Higher enzyme efficiency
This genotype is associated with higher efficiency in the FADS1 enzyme's ability to convert plant-based fats into essential Omega-3 and Omega-6 fatty acids. Research suggests this variant may influence your baseline levels of long-chain polyunsaturated fatty acids in the blood. Please discuss any dietary changes or supplement needs with your healthcare provider.
The frequency of this genotype varies significantly by ancestry, being more common in populations with a long history of specific dietary adaptations.
Intermediate enzyme efficiency
This genotype represents an intermediate state for the FADS1 enzyme's catalytic efficiency in processing fatty acids. You may experience metabolic responses to dietary fats that fall between the extremes observed in other genotypes. Consult with a registered dietitian or physician to understand how your specific metabolic profile might interact with your current dietary intake.
This is a common heterozygous genotype found across many global populations.
Reduced enzyme efficiency
This genotype is associated with reduced catalytic efficiency of the FADS1 enzyme, which can create a metabolic bottleneck when converting plant-based fats like alpha-linolenic acid into EPA and DHA. Some studies indicate this may correlate with lower levels of certain lipids, such as HDL cholesterol, particularly when dietary intake of linoleic acid is high. Please discuss your nutritional status and any potential need for targeted supplementation with your clinician or a qualified nutritionist.
This genotype is observed at varying frequencies globally and is notably common in certain populations, though it remains less frequent than the G allele in many groups.
Understanding the rs174547 Variant
The rs174547 variant is a common genetic change, specifically a single-nucleotide polymorphism (SNP), located on chromosome 11 at position 61,803,311. It sits within an intron of the FADS1 gene, which is part of a cluster of genes involved in fatty acid metabolism. In genetic terms, this variant involves a substitution of the nucleotides cytosine (C) and thymine (T). Because it is located in a non-coding region, it does not change the protein sequence directly, but research indicates it influences the expression levels of the FADS1 gene. This means that individuals with different genotypes may produce varying amounts of the enzymes necessary for processing dietary fats. Scientists study this SNP to understand how genetic diversity contributes to the wide range of lipid profiles observed across different human populations.
The Role of the FADS1 Gene
The FADS1 gene provides instructions for making an enzyme called delta-5 desaturase. This enzyme is a critical component of the metabolic pathway that converts dietary polyunsaturated fatty acids (PUFAs), such as linoleic acid and alpha-linolenic acid, into more complex, long-chain fatty acids like arachidonic acid and eicosapentaenoic acid (EPA). These long-chain fats are essential for maintaining cell membrane integrity and supporting various physiological processes. When the FADS1 gene is highly active, the body is more efficient at synthesizing these long-chain fats from plant-based precursors. Conversely, reduced expression of this gene can lead to lower levels of these specific fatty acids in the blood. Because the rs174547 variant is associated with these differences in gene expression, it serves as a key focus for researchers investigating how genetics influence nutritional requirements and lipid metabolism.
Research Associations and Evidence
The association between rs174547 and lipid metabolism is supported by a strong body of evidence from genome-wide association studies (GWAS). Research has consistently linked this variant to differences in plasma phospholipid fatty acid composition, including levels of arachidonic acid and linoleic acid. Furthermore, studies have observed associations between this SNP and various lipid markers, such as total cholesterol, LDL cholesterol, and triglyceride levels. Some research suggests that the minor C allele may be associated with lower cardiovascular risk markers, though these findings can be complex and context-dependent. It is important to note that while these statistical associations are robust, they represent population-level trends rather than individual health outcomes. The influence of this variant on health is also likely modulated by environmental factors, such as dietary intake of omega-3 and omega-6 fatty acids, making it a subject of ongoing investigation in the field of nutrigenomics.
Population Frequency and Variability
The frequency of the rs174547 alleles varies significantly across different global populations. Data from large-scale genomic projects indicate that the minor allele frequency (MAF) for the C allele is approximately 0.33, though this can fluctuate depending on the specific ancestral background of the group being studied. For instance, some studies have noted higher frequencies of certain FADS1 variants in specific Amerindian populations compared to others. This geographic and ethnic variability is a common feature of genetic markers that have been subject to different evolutionary pressures, such as historical dietary patterns. Understanding these frequency differences is essential for researchers to avoid bias in genetic studies and to ensure that findings are applicable across diverse groups. Because of this variability, the impact of the rs174547 genotype on lipid profiles may not be uniform across all individuals or populations.
Interpreting Your Genetic Information
If you have access to your genetic data regarding rs174547, it is important to view this information as a piece of a much larger puzzle. While this variant is associated with how your body processes fats, it does not determine your overall health or dictate your dietary needs in isolation. Many factors, including your total diet, physical activity, age, and other genetic markers, play a significant role in your lipid profile and cardiovascular health. You cannot use this information to diagnose a condition or to make specific medical decisions. If you are concerned about your cholesterol levels, fatty acid intake, or cardiovascular health, you should consult with a qualified healthcare provider or a registered dietitian. They can help you interpret your health data in the context of your personal medical history and provide guidance on evidence-based lifestyle or dietary adjustments.
How common is this variant?
The C allele of rs174547 has a global minor allele frequency of approximately 0.33, though this frequency varies significantly across different ancestral populations.
Frequently asked questions
Does my rs174547 genotype mean I need to take fish oil supplements?
Genetic variants like rs174547 influence how your body processes fats, but they do not provide a direct recommendation for supplementation. You should discuss your lipid profile and dietary needs with a healthcare provider to determine if supplements are appropriate for you.
Can this variant predict my risk of heart disease?
While rs174547 is associated with lipid markers like cholesterol and triglycerides, it is only one of many factors that contribute to cardiovascular health. It is not a diagnostic tool for heart disease and should not be used to predict individual risk.
Is the rs174547 variant the same as the FADS1 gene?
No, rs174547 is a specific genetic variant (a SNP) located within the FADS1 gene. The gene itself is the segment of DNA that codes for the delta-5 desaturase enzyme, while the variant is a single-letter difference in that DNA sequence.
Why do some populations have different frequencies of this variant?
Differences in allele frequencies across populations are often the result of evolutionary history and adaptation to local environments, including historical dietary habits. These variations reflect the diverse ways human populations have adapted to different nutritional landscapes over time.
Sources & further reading
Educational information only, last refreshed 10/9/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Key regulatory polymorphism governing the efficiency of dietary polyunsaturated fatty acid (PUFA) conversion to arachidonic and eicosapentaenoic acids.
Regulatory variant in FADS1 associated with the efficiency of long-chain polyunsaturated fatty acid biosynthesis.
Variant in the FADS gene cluster associated with plasma levels of long-chain polyunsaturated fatty acids.
Regulates fatty acid desaturase expression, altering conversion efficiency of dietary alpha-linolenic acid to EPA and DHA.
The ancestral C allele of this FADS1 variant influences blood fatty acid profiles, specifically reducing arachidonic acid.
Influences the efficiency of processing plant-based Omega-3 into EPA/DHA.