Understanding rs786200905 and the RAPSN Gene
The genetic variant rs786200905 is a specific change in the human genome located within the RAPSN gene. It has been identified in clinical databases as a factor associated with certain forms of congenital myasthenic syndrome.
What each genotype means
Typical genetic profile
This genotype represents the reference sequence at this position in the RAPSN gene. It is considered the common or typical state observed in the general population.
This is the most common genotype observed in the general population.
Heterozygous carrier status
This genotype indicates that you carry one copy of the variant allele. Research in clinical databases has associated the G allele with pathogenic outcomes in the RAPSN gene, so you should discuss this finding with a genetic counselor or clinician to understand its implications for your health.
The frequency of this specific heterozygous genotype is not well-documented in large-scale population databases.
Pathogenic variant profile
This genotype consists of two copies of the variant allele, which has been classified as pathogenic in clinical databases. This variant is associated with the RAPSN gene, and you should consult with a medical professional to discuss the clinical significance of this result.
This genotype is rare and its specific frequency across global populations is currently unknown.
What is rs786200905?
The identifier rs786200905 refers to a specific single nucleotide polymorphism (SNP) located on chromosome 11. In the human genome, this variant is positioned within the RAPSN gene, which provides instructions for making a protein essential for the function of the neuromuscular junction. The neuromuscular junction is the critical site where nerve cells communicate with muscle cells to trigger contraction. When a variant occurs in this region, it can potentially alter the structure or expression of the associated protein, which may impact how signals are transmitted between nerves and muscles. Scientists track these specific genomic locations to better understand how variations in our DNA sequence contribute to biological diversity and, in some cases, the development of rare inherited conditions.
The Role of the RAPSN Gene
The RAPSN gene encodes the receptor-associated protein of the synapse, commonly known as rapsyn. This protein plays a vital role in clustering and anchoring acetylcholine receptors at the neuromuscular junction. By keeping these receptors in the correct position, rapsyn ensures that the chemical signals sent from nerves are effectively received by muscle fibers. Without functional rapsyn, these receptors may become scattered or unstable, leading to a breakdown in communication between the nervous system and the muscular system. Research into the RAPSN gene is primarily focused on how mutations or variants within this sequence affect the stability of these synaptic connections, which is a fundamental area of study in neuromuscular biology and clinical genetics.
Clinical Associations and Evidence
Clinical databases, including ClinVar, have documented rs786200905 in the context of congenital myasthenic syndromes. These are a group of rare, inherited disorders characterized by muscle weakness that worsens with physical exertion. The evidence linking this specific variant to these conditions is derived from clinical observations and research into allelic variants. It is important to note that the presence of a variant does not automatically result in a clinical diagnosis. The interpretation of such variants is complex and often depends on the presence of other genetic factors or the specific inheritance pattern involved. Because this variant is associated with rare clinical presentations, it is categorized as a high-attention marker in clinical genetics, requiring professional evaluation for any individual who may be concerned about its potential health implications.
Understanding Your Information
If you have encountered this variant in a personal genetic report, it is essential to understand that this information is for educational purposes only. Genetic variants are pieces of data that require professional interpretation within the context of your full medical history, family background, and physical symptoms. You cannot use this information to diagnose yourself or others. If you are concerned about muscle weakness, fatigue, or any other symptoms, you should consult with a qualified healthcare provider or a genetic counselor. They can provide the necessary clinical context, order appropriate diagnostic testing if needed, and help you understand what these findings mean for your health. Never make changes to your medical care or lifestyle based solely on a genetic report without first discussing the findings with your clinician.
How common is this variant?
The population frequency for rs786200905 is currently unknown, as it is a rare variant primarily identified in clinical research settings rather than broad population studies.
Frequently asked questions
What is a congenital myasthenic syndrome?
Congenital myasthenic syndromes are a group of rare, inherited disorders that cause muscle weakness. They occur because of defects in the proteins that allow nerves to communicate with muscles.
Does having this variant mean I have a disease?
No, having a specific genetic variant does not mean you have a disease. Genetic findings must be interpreted by a doctor who can consider your symptoms and family history.
Where can I find more information on the RAPSN gene?
You can search for the RAPSN gene on the National Library of Medicine's MedlinePlus Genetics website. It provides comprehensive, plain-language summaries of genes and their roles in health.
Should I be worried if I see this in my report?
It is normal to have questions about genetic reports, but you should not be worried. Discuss the report with your healthcare provider, who can explain the findings in the context of your overall health.
Sources & further reading
Educational information only, last refreshed 10/4/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs786200905?
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
This variant in the TYK2 gene is identified as a shared causal signal in the genetic architecture of psoriasis and rheumatoid arthritis.
This TYK2 variant shows evidence of antagonistic pleiotropy, with opposite effects on the risk of psoriasis versus rheumatoid arthritis.
This SNP acts as an intermediate allele tag for the C9orf72 repeat expansion, which is linked to both ALS risk and longevity outcomes.
This variant in the CDKN2B-AS1 long noncoding RNA gene is associated with extreme longevity in genome-wide association studies.
This variant has been identified as a shared genetic signal between longevity and Alzheimer's disease risk.
A variant in the ALOX5 gene associated with potential modulation of inflammatory responses to dietary factors.