BCKDHB rs1057516795: What Your Genotype Means
The rs1057516795 variant is a genetic alteration located within the BCKDHB gene. This gene is associated with Maple Syrup Urine Disease (MSUD), a rare inherited metabolic disorder that affects the body's ability to break down certain amino acids.
What each genotype means
Carrier status
This genotype indicates you carry one copy of the deletion and one copy of the reference sequence. As MSUD is an autosomal recessive disorder, carriers typically do not exhibit symptoms of the condition but may pass the variant to their biological children.
Carrier frequency for this specific variant is low across most global populations, though it may be higher in specific ancestral groups where the variant is documented.
Typical genetic profile
This genotype represents the reference sequence at this location. It is not associated with the metabolic dysfunction characteristic of Maple Syrup Urine Disease linked to this specific variant.
This is the most common genotype observed in the general population.
Understanding the BCKDHB Gene
The BCKDHB gene provides instructions for creating the beta subunit of an enzyme complex known as branched-chain alpha-ketoacid dehydrogenase (BCKD). This complex is essential for the normal metabolism of three specific amino acids: leucine, isoleucine, and valine. These amino acids are building blocks of proteins found in many common foods, such as meat, eggs, and dairy. When the BCKD complex functions correctly, it breaks these amino acids down so the body can use them for energy or other vital processes. If the BCKDHB gene contains mutations that disrupt this process, these amino acids and their toxic byproducts can accumulate in the body. This buildup is particularly harmful to the nervous system and is the primary cause of the symptoms observed in individuals with Maple Syrup Urine Disease.
What is the rs1057516795 Variant?
The rs1057516795 variant is a specific change in the DNA sequence of the BCKDHB gene. In genetic databases, this variant is categorized as a structural or insertion-deletion type change, often involving a sequence of nucleotides rather than a single letter swap. It is documented in clinical databases like ClinVar and SNPedia as a variant of interest within the context of MSUD. Because the BCKDHB gene is critical for metabolic health, variants in this region are studied to determine if they reduce or eliminate the activity of the BCKD enzyme complex. While some variants in this gene are well-characterized as pathogenic, the clinical significance of any specific variant depends on its impact on protein function. Researchers use genomic sequencing to identify these changes and correlate them with clinical presentations of metabolic disorders.
Research and Clinical Associations
Research into the BCKDHB gene has identified over 90 different mutations linked to MSUD. The evidence for the pathogenicity of variants in this gene is generally strong, as MSUD is a well-defined autosomal recessive condition. However, the strength of evidence for any single variant, such as rs1057516795, can vary based on the number of reported clinical cases and functional studies. Most individuals with MSUD inherit two copies of a pathogenic variant—one from each parent. In clinical settings, identifying these variants is crucial for confirming a diagnosis of MSUD, which typically presents in infancy with symptoms like poor feeding, lethargy, and a characteristic sweet odor in the urine. Because MSUD is a serious condition, clinical geneticists evaluate these variants carefully to distinguish between benign changes and those that cause disease.
Population Frequency and Interpretation
The rs1057516795 variant is considered rare in the general population. Genetic variants associated with rare metabolic disorders like MSUD often show significant differences in frequency across various ancestral groups, sometimes appearing as founder mutations in specific populations. Because this variant is rare, it is unlikely to be found in the general public without a specific clinical reason for testing. If you have received information about this variant from a genetic report, it is important to understand that this does not constitute a medical diagnosis. Genetic testing results should always be interpreted by a qualified healthcare professional, such as a genetic counselor or a metabolic specialist, who can place the finding in the context of your personal and family health history.
Managing Genetic Information
If you are concerned about this variant or have a family history of metabolic conditions, the most appropriate step is to consult with a medical professional. You cannot diagnose yourself or determine your health risk based solely on a single SNP result. A clinician can order validated diagnostic tests, interpret the results accurately, and discuss potential implications for you or your family members. Avoid making any changes to your diet or health regimen based on raw genetic data. Instead, use this information as a starting point for a conversation with your doctor. They can provide guidance on whether further clinical testing is necessary and help you understand the difference between a carrier status and a clinical diagnosis of a metabolic disorder.
How common is this variant?
The rs1057516795 variant is documented as rare in global population databases, with specific frequencies varying significantly by ancestry.
Frequently asked questions
What is Maple Syrup Urine Disease?
Maple Syrup Urine Disease is a rare, inherited metabolic disorder where the body cannot break down certain amino acids. This leads to a buildup of toxic substances that can cause serious health issues if not managed.
Does having this variant mean I have MSUD?
No, having a variant does not automatically mean you have the disease. MSUD is typically an autosomal recessive condition, meaning it usually requires two pathogenic variants to manifest symptoms.
Should I change my diet if I have this variant?
You should never change your diet based on a genetic report. Consult with a metabolic specialist or a registered dietitian before making any changes to your nutritional intake.
How can I get a formal diagnosis?
A formal diagnosis is made by a healthcare provider through clinical evaluation, blood tests for amino acid levels, and confirmatory genetic testing performed in a certified laboratory.
Where can I find a genetic counselor?
You can find a board-certified genetic counselor through professional organizations like the National Society of Genetic Counselors (NSGC) or by asking your primary care physician for a referral.
Sources & further reading
Educational information only, last refreshed 10/10/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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Pathogenic missense mutation (p.Arg183Pro / R183P) in BCKDHB causing autosomal recessive maple syrup urine disease type 1B.
Pathogenic BCKDHB missense variant (p.Arg183Pro) causative of Maple Syrup Urine Disease (MSUD) type 1B, common in expanded carrier panels.
A missense variant (c.548A>G, p.Asn183Ser) in BCKDHB causing classic Maple Syrup Urine Disease (MSUD) type 1B in homozygotes and defining Ashkenazi Jewish carrier status.
Carrier variant for maple syrup urine disease type 1B (c.827T>G; p.Arg276Gly), common in the Ashkenazi Jewish population.