GCDH rs752127949: Carrier Status and Glutaric Aciduria
The genetic variant rs752127949 is an extremely rare missense change located within the GCDH gene on chromosome 19. It is classified in clinical databases as a pathogenic variant linked to glutaric aciduria type 1 (GA1), an autosomal recessive neurometabolic disorder. Because GA1 requires two non-functioning gene copies to manifest, individuals carrying a single copy of rs752127949 are typically asymptomatic carriers.
What each genotype means
Typical GCDH gene profile
This genotype represents the most common sequence found at this location in the GCDH gene. It is not associated with the pathogenic changes linked to glutaric aciduria type 1. Individuals with this profile do not carry the specific variant identified as a potential risk factor for this condition.
This is the most common genotype observed across all global populations.
Carrier status
This genotype indicates that you carry one copy of the variant, which is classified as a pathogenic missense variant in the GCDH gene. Because glutaric aciduria type 1 is an autosomal recessive condition, carrying a single copy typically does not cause the disease, but you may be a carrier. You should discuss these results with a genetic counselor or healthcare provider to understand the implications for family planning.
This genotype is rare, with an allele frequency of less than 0.0001 in the general population.
Potential disease risk
This genotype indicates that both copies of the GCDH gene contain this variant. Because this variant is linked to glutaric aciduria type 1, this result warrants immediate clinical follow-up with a metabolic specialist or geneticist. Please consult with your healthcare provider to discuss diagnostic testing and clinical management options.
This genotype is extremely rare in the general population.
What Is rs752127949 and Where Is It Located?
The single nucleotide polymorphism rs752127949 sits in the GCDH gene, which maps to the short arm of chromosome 19 (19p13.13). At the molecular level, this marker represents a missense substitution that alters the coding sequence of the glutaryl-CoA dehydrogenase enzyme. In clinical repositories such as ClinVar and dbSNP, alterations at this position have been cataloged in connection with inborn errors of metabolism. Because it alters a specific amino acid in the encoded enzyme, the variant has the potential to compromise normal protein structure or enzymatic stability. Despite its documented clinical relevance, rs752127949 is exceptionally rare across global populations, meaning that finding this variant in consumer genetic data is an infrequent occurrence that requires careful verification.
The Biological Role of the GCDH Gene
The GCDH gene provides the genetic blueprint for glutaryl-CoA dehydrogenase, a flavoprotein enzyme localized to the mitochondrial matrix. This enzyme plays an essential role in cellular energy pathways by catalyzing the oxidative decarboxylation of glutaryl-CoA into crotonyl-CoA. This step is a critical juncture in the breakdown of dietary amino acids, specifically L-lysine, L-hydroxylysine, and L-tryptophan. When GCDH is severely deficient or absent, metabolic intermediates such as glutaric acid, 3-hydroxyglutaric acid, and glutarylcarnitine accumulate in body tissues and blood. If left unmanaged, this accumulation can lead to metabolic crises and selective damage to vulnerable neurological regions, particularly the striatum within the basal ganglia.
Evidence Strength and Clinical Associations
Pathogenic variants in GCDH are firmly established as the underlying cause of glutaric aciduria type 1 (GA1), an autosomal recessive disorder cataloged under OMIM #231670. However, the specific evidence base directly evaluating rs752127949 remains limited due to its extremely low incidence in the general population. In public registries, missense alterations like rs752127949 are classified as pathogenic or likely pathogenic primarily through pedigree analysis, functional homology, or in silico pathogenicity algorithms. Because GA1 is strictly recessive, carrying one altered allele does not cause the clinical disorder. Disease manifestation only occurs when an individual inherits two pathogenic alleles—either two copies of the same variant or two distinct variants in compound heterozygosity.
Understanding Population Frequency
Across large genomic reference projects like the Genome Aggregation Database (gnomAD), rs752127949 is categorized as an ultra-rare variant, with observed allele frequencies well below 0.0001 (0.01%). In many broad sub-populations, the variant is observed only in single individuals or not detected at all in population cohorts. While GA1 as an overall condition has an estimated incidence of roughly 1 in 90,000 to 1 in 100,000 newborns worldwide, specific founder mutations predominate in certain demographic isolates such as the Old Order Amish and Canadian Ojibwa populations. For rs752127949 specifically, current genomic data does not indicate substantial enrichment in any single modern population, underscoring its status as an uncommon global variant.
What You Can and Cannot Do With This Information
Learning about carrier status for rs752127949 provides informational insight into inherited carrier status rather than a direct personal diagnosis. Heterozygous carriers maintain sufficient functional glutaryl-CoA dehydrogenase from their unaffected allele, meaning they generally remain healthy and asymptomatic without developing GA1. Direct-to-consumer genetic findings should not be used to self-diagnose or make independent changes to diet, supplements, or medical care. If consumer or clinical testing reports an alteration at rs752127949, standard practice involves confirming the result with clinical-grade Sanger or targeted panel sequencing, followed by consultation with a medical geneticist or certified genetic counselor to evaluate reproductive implications.
How common is this variant?
The rs752127949 variant is extremely rare across global ancestries, with an overall gnomAD allele frequency estimated at less than 0.0001 (0.01%). The vast majority of people worldwide carry two reference copies of the sequence at this position.
Frequently asked questions
What is glutaric aciduria type 1 (GA1)?
Glutaric aciduria type 1 is a rare inherited metabolic condition where the body cannot properly break down the amino acids lysine, hydroxylysine, and tryptophan. This causes toxic organic acids to accumulate, which can trigger metabolic crises and damage parts of the brain that control movement.
Does carrying one copy of rs752127949 mean I have GA1?
No, carrying a single copy does not cause glutaric aciduria type 1. GA1 is inherited in an autosomal recessive manner, meaning a person must inherit two disrupted GCDH copies—one from each parent—to be clinically affected.
How common is rs752127949 in the general population?
The rs752127949 variant is exceptionally rare, observed at a frequency under 0.01% in broad reference cohorts such as gnomAD. Almost everyone in the general population carries two functional reference copies at this genetic site.
What should I do if my genetic data reports this variant?
Direct-to-consumer data should never be used alone for diagnostic or medical decisions. You should share your raw data or test report with a healthcare professional or genetic counselor, who can arrange clinical-grade confirmatory testing and discuss what carrier status means for family planning.
Sources & further reading
Educational information only, last refreshed 9/6/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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