ATP6V0A2 rs80356755: Cutis Laxa Carrier Status
The genetic variant rs80356755 is an ultra-rare single nucleotide change located in the ATP6V0A2 gene on chromosome 12. In medical literature, pathogenic disruptions in this gene are associated with autosomal recessive cutis laxa type 2A (ARCL2A) and related connective tissue disorders. Because this condition follows an autosomal recessive inheritance model, carrying a single altered copy generally denotes carrier status rather than active clinical disease.
What each genotype means
Typical genetic profile
This genotype represents the common, non-pathogenic form of this genetic location. It is not associated with the development of ATP6V0A2-related cutis laxa.
This is the most common genotype found in the general population.
Carrier status
Individuals with this genotype carry one copy of the pathogenic variant associated with autosomal recessive cutis laxa with osteodystrophy. As this is an autosomal recessive condition, carriers typically do not exhibit symptoms of the disorder, but should consult with a genetic counselor regarding reproductive risks.
This genotype is rare in the general population.
Associated with clinical condition
This genotype is associated with ATP6V0A2-related cutis laxa, an autosomal recessive disorder characterized by connective tissue abnormalities and potential developmental delay. Clinical presentation can vary, and individuals with this result should discuss these findings with a medical geneticist or healthcare provider for appropriate clinical evaluation.
This genotype is extremely rare in the general population.
What is rs80356755 and Where Is It Located?
The variant rs80356755 represents a specific genomic locus situated within the ATP6V0A2 gene, located on chromosome 12 at band 12q24.31. Variants at this locus represent changes in the DNA sequence that encode essential cellular machinery. In human populations, the vast majority of individuals carry the standard wild-type sequence at this position, making alternative alleles extraordinarily uncommon. In genetic research and clinical curation pipelines, variants within this gene are tracked closely because severe coding disruptions can directly impact the structural integrity of the resulting protein. The variant rs80356755 is classified in genomic catalogs under carrier status and rare disease genetics due to its association with severe autosomal recessive connective tissue phenotypes.
The Biological Role of the ATP6V0A2 Gene
The ATP6V0A2 gene encodes the a2 subunit of the vacuolar H+-ATPase (V-ATPase) multi-protein complex. This molecular complex functions as an ATP-dependent proton pump that regulates the internal acidity (pH) of intracellular organelles, particularly the Golgi apparatus and endosomes. Proper acidification within the Golgi apparatus is critically required for the normal glycosylation of proteins—a biochemical process where sugar chains are attached to proteins. When V-ATPase function is compromised by pathogenic variants, the glycosylation of proteins responsible for assembling and maintaining extracellular matrix structures, such as elastic fibers, becomes disrupted. This cellular impairment places conditions caused by ATP6V0A2 variants at the intersection of connective tissue disorders and congenital disorders of glycosylation.
Associated Clinical Conditions and Evidence Strength
Biallelic loss-of-function variants in ATP6V0A2—meaning changes present on both copies of the gene—cause autosomal recessive cutis laxa type 2A (ARCL2A) and the related, milder phenotype known as wrinkly skin syndrome. These disorders are clinically recognized by redundant, inelastic, sagging skin, craniofacial features such as delayed fontanelle closure, developmental delays, and skeletal or osteodystrophic abnormalities. The clinical evidence linking damaging mutations in ATP6V0A2 to autosomal recessive cutis laxa is well established in medical genetics; however, individual literature and clinical database documentation for specific variants like rs80356755 often remain limited due to the extreme rarity of the condition. In individuals with only one copy of an altered allele, symptoms of cutis laxa typically do not manifest.
Population Frequency and Carrier Inheritance
The variant rs80356755 is exceptionally rare across global populations, appearing at near-zero frequencies in broad population databases such as gnomAD. Overall, cutis laxa has an estimated worldwide prevalence of roughly 1 in 4,000,000 live births, with ATP6V0A2-related forms representing a subset of these rare occurrences. Because the condition is inherited in an autosomal recessive manner, an individual must inherit two pathogenic ATP6V0A2 variants (one from each biological parent) to develop the clinical disorder. A person with one copy of the variant is considered an asymptomatic carrier, with a 25% chance of passing the condition to offspring if their reproductive partner is also a carrier of a pathogenic variant in the same gene.
Understanding and Using This Genetic Information
Discovering a rare variant such as rs80356755 on a personal genetic report primarily provides information relevant to reproductive planning and family carrier screening. Because commercial direct-to-consumer genotyping arrays can produce false-positive calls when probing extremely rare loci, any unexpected finding should be verified through clinical-grade Sanger sequencing or targeted gene sequencing before drawing medical conclusions. This genetic information does not constitute a clinical diagnosis, nor does carrying a single variant imply that an individual will develop loose skin, skeletal issues, or neurological symptoms. Individuals with questions regarding rare carrier results or a family history of connective tissue disorders should consult a certified genetic counselor or clinical geneticist.
How common is this variant?
The rs80356755 variant is extraordinarily rare globally, with allele frequencies approaching zero in major human reference panels such as gnomAD, and all forms of cutis laxa collectively affect roughly 1 in 4,000,000 individuals.
Frequently asked questions
What does a carrier status result for rs80356755 mean?
Being a carrier means having one altered copy of the ATP6V0A2 gene alongside one normal copy. Because cutis laxa type 2A is an autosomal recessive disorder, carriers do not typically experience symptoms, but they can potentially pass the variant to their children.
Can rs80356755 cause cutis laxa on its own?
No, a single copy of rs80356755 is generally insufficient to cause cutis laxa. Clinical disease requires two pathogenic variants—one inherited from each parent—which disrupt normal ATP6V0A2 protein production.
How reliable are consumer DNA test results for rare variants like rs80356755?
Consumer genotyping platforms are designed primarily for common variants and have higher error rates for ultra-rare mutations. Any finding involving an ultra-rare disease variant should always be confirmed through diagnostic clinical sequencing ordered by a medical professional.
What is the primary function of the ATP6V0A2 gene?
ATP6V0A2 provides instructions for assembling a component of the V-ATPase proton pump, which maintains optimal acidity inside cellular structures like the Golgi apparatus. This environment is essential for the glycosylation processes needed to build and preserve elastic fibers in connective tissues.
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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