BTD rs397514351: Understanding Biotinidase Deficiency Carrier Status
The rs397514351 variant is a genetic change located within the BTD gene, which provides instructions for the biotinidase enzyme. This variant is associated with carrier status for biotinidase deficiency, a condition that affects the body's ability to recycle the essential vitamin biotin.
What each genotype means
Typical biotinidase activity
This genotype represents the most common genetic sequence at this location. It is not associated with biotinidase deficiency, and individuals with this result are not considered carriers of this specific variant.
This is the most common genotype observed in the general population.
Biotinidase deficiency carrier
This genotype indicates you carry one copy of a variant associated with biotinidase deficiency. Carriers typically have sufficient enzyme activity to remain healthy, but you should discuss this result with a genetic counselor or healthcare provider to understand the implications for family planning.
This genotype is rare in the general population.
Potential biotinidase deficiency
This genotype indicates the presence of two copies of the variant. Individuals with this result may have reduced biotinidase enzyme activity, which is the underlying cause of biotinidase deficiency. Please consult with a medical professional or metabolic specialist to discuss clinical testing and potential management.
This genotype is extremely rare.
What is the rs397514351 Variant?
The rs397514351 variant is a specific change in the DNA sequence of the BTD gene. In genetics, a variant like this is often referred to as a single nucleotide polymorphism (SNP) or a mutation, depending on its frequency and impact. This particular variant is located on chromosome 3. It represents a variation in the genetic code that can alter the production or function of the biotinidase enzyme. Because the BTD gene is responsible for creating an enzyme that recycles biotin, changes in this gene can lead to reduced enzyme activity. Researchers track these variants to understand how they contribute to inherited metabolic conditions. While many variants in the BTD gene are benign, others are linked to clinical symptoms, making the study of specific markers like rs397514351 important for understanding individual health profiles and potential risks for inherited disorders.
The Role of the BTD Gene
The BTD gene provides the blueprint for the biotinidase enzyme, which is critical for the body's metabolism. Biotin, also known as vitamin B7, is an essential nutrient found in foods like egg yolks, liver, and milk. Under normal conditions, biotinidase recycles biotin by removing it from proteins in the diet, allowing the body to reuse this vitamin for various metabolic processes. When the BTD gene contains variants that reduce or eliminate the activity of this enzyme, the body cannot effectively recycle biotin. This leads to a deficiency that can impact the breakdown of fats, proteins, and carbohydrates. Biotinidase deficiency is categorized into two main types: profound deficiency, where enzyme activity is less than 10 percent of normal, and partial deficiency, where activity is between 10 and 30 percent. Proper enzyme function is vital for preventing developmental delays and other health complications.
Research and Clinical Associations
Research into rs397514351 links it to carrier status for biotinidase deficiency. Being a carrier typically means an individual has one copy of a variant that could cause a condition if inherited alongside another variant from the other parent. In the context of biotinidase deficiency, clinical screening—often performed as part of newborn screening programs—is used to detect reduced enzyme activity. Evidence for specific variants in the BTD gene is often derived from clinical case reports and population studies. While some variants are well-established as pathogenic, others may have limited or conflicting evidence regarding their exact impact on enzyme function. It is important to note that genetic associations are statistical in nature. The presence of a variant does not guarantee that an individual will experience symptoms, as environmental factors and other genetic modifiers can influence the clinical outcome of biotinidase deficiency.
Understanding Your Results
If you have received information about your status regarding rs397514351, it is essential to understand what this means in a clinical context. Genetic testing for carrier status is often used for family planning and to understand the risk of passing a condition to offspring. However, this information should never be used to self-diagnose or make medical decisions. If you are concerned about your results or have a family history of metabolic disorders, you should consult with a healthcare professional or a genetic counselor. They can provide context based on your full medical history and explain the implications of your genotype. Furthermore, if you are currently taking any supplements or medications, discuss these with your clinician or pharmacist, as they can provide guidance on whether your genetic profile necessitates any changes to your health management or monitoring.
How common is this variant?
The rs397514351 variant is considered rare in the general population. Specific frequency data can vary significantly by ancestry and is often documented in large-scale genomic databases like gnomAD.
Frequently asked questions
What is biotinidase deficiency?
Biotinidase deficiency is an inherited metabolic disorder where the body cannot recycle biotin. If untreated, it can lead to symptoms like seizures, skin rashes, and developmental delays.
Does being a carrier mean I have the disease?
Generally, being a carrier means you have one copy of a variant and typically do not show symptoms of the condition. However, you should discuss your specific results with a genetic counselor to understand your personal risk.
How is biotinidase deficiency treated?
Biotinidase deficiency is typically managed through lifelong supplementation with biotin. Early detection through newborn screening allows for treatment that can prevent most complications.
Should I change my diet if I am a carrier?
Carrier status does not usually require dietary changes. Always consult with your doctor or a registered dietitian before making significant changes to your diet or supplement regimen.
Sources & further reading
Educational information only, last refreshed 9/26/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs397514351?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29Related variants in BTD
This variant is identified as a carrier mutation for biotinidase deficiency.
This variant is a known carrier mutation for biotinidase deficiency.
This variant is associated with carrier status for biotinidase deficiency.
Carrier variant associated with autosomal recessive biotinidase deficiency.
Carrier variant indicating predisposition to pass on autosomal recessive biotinidase deficiency.
Pathogenic missense variant causing biotinidase deficiency, a recessive metabolic disorder, making single-copy carriers important for reproductive genetic screening.