CFTR rs104894301: Understanding This Rare Genetic Variant

What each genotype means

What is rs104894301?

The rs104894301 variant is a single nucleotide polymorphism (SNP) found within the CFTR gene. In genetics, a SNP represents a variation at a single position in the DNA sequence. This specific variant is categorized as a rare mutation, meaning it is not commonly found in the general population. Because the CFTR gene is large and complex, researchers track specific variants like rs104894301 to understand how they might alter the function of the protein the gene encodes. When a variant occurs in a gene associated with a recessive condition, it is often studied to determine if it contributes to disease symptoms or if it is a benign change that does not impact health. Geneticists use databases like ClinVar and gnomAD to catalog these variants and assess their frequency and potential clinical impact across different ancestral groups.

The Role of the CFTR Gene

The CFTR gene provides instructions for making the cystic fibrosis transmembrane conductance regulator protein. This protein functions as a channel across the membranes of cells that produce mucus, sweat, saliva, tears, and digestive enzymes. It is responsible for transporting negatively charged particles called chloride ions into and out of cells. This movement of chloride ions helps control the movement of water in tissues, which is necessary for the production of thin, freely flowing mucus. When the CFTR protein is dysfunctional or absent, the mucus becomes thick and sticky, which can lead to blockages and infections in the lungs, pancreas, and other organs. Because of its critical role in maintaining fluid balance, mutations in the CFTR gene are the primary cause of cystic fibrosis, a condition that affects the respiratory and digestive systems.

Research and Clinical Associations

Research into rs104894301 focuses on its potential to disrupt normal CFTR protein function. Clinical evidence for rare variants is often gathered through case studies and diagnostic testing of individuals presenting with symptoms of cystic fibrosis or CFTR-related disorders, such as chronic pancreatitis or bronchiectasis. Because this variant is rare, the evidence strength is currently considered moderate. Scientists look for evidence of pathogenicity by analyzing whether the variant is found in individuals with clinical symptoms and by using computational models to predict if the change in the DNA sequence will damage the resulting protein. It is important to note that the presence of a variant does not automatically equate to a diagnosis. Clinical interpretation requires a comprehensive review of an individual's symptoms, family history, and other genetic factors by a qualified healthcare professional.

Population Frequency

The rs104894301 variant is classified as rare in the general population. Population frequency data, such as that found in the Genome Aggregation Database (gnomAD), is essential for determining how often a variant appears in healthy individuals versus those with specific conditions. For rare variants, the frequency is often so low that it is difficult to establish a clear statistical association with disease without large-scale studies. Because frequencies can vary significantly between different ethnic and ancestral groups, a variant that is rare in one population might be slightly more common in another. Researchers continue to collect data to refine these frequency estimates, which helps clinicians distinguish between common benign variations and rare, potentially pathogenic mutations.

Navigating Genetic Information

If you have received information about the rs104894301 variant through genetic testing, it is important to understand what this means for your health. Genetic testing results can be complex and are often best interpreted in the context of a clinical consultation. You cannot diagnose yourself or determine your health risks based solely on a single variant report. If this variant was identified in a clinical report, discuss the findings with a genetic counselor or a physician who specializes in genetics. They can help explain the significance of the variant, whether it requires further testing, and how it relates to your specific health history. Avoid making medical decisions based on online information alone, as clinical context is essential for accurate assessment and care.

Frequently asked questions

Sources & further reading

Related variants in CFTR