GBA rs387906315: Understanding the 84GG Mutation
The rs387906315 variant, commonly referred to as the 84GG mutation, is a specific genetic alteration within the GBA gene. It is recognized as a pathogenic mutation associated with Gaucher disease, a condition involving the body's ability to process certain fats.
What each genotype means
Gaucher disease carrier
This genotype indicates you carry one copy of the 84GG mutation, also known as c.84dupG. Carriers are typically unaffected by Gaucher disease, but should discuss the implications of this carrier status with a genetic counselor or physician, especially regarding family planning.
This genotype is rare in the general population.
Gaucher disease associated
This genotype involves two copies of the 84GG mutation, which is a known causal mutation for Gaucher disease. This condition is a lysosomal storage disorder that requires clinical evaluation and management by a healthcare professional.
This genotype is extremely rare in the general population.
What is rs387906315?
The variant rs387906315 is a specific genetic change located within the GBA gene on chromosome 1. In scientific literature, this variant is frequently identified by the shorthand '84GG,' which describes the insertion of an extra guanine nucleotide into the gene's coding sequence. This insertion causes a frameshift, which essentially scrambles the genetic instructions that follow. Because of this shift, the cellular machinery that reads the gene to build proteins encounters an early stop signal, resulting in a truncated and non-functional version of the intended protein. This variant is categorized as a pathogenic mutation, meaning it is known to disrupt normal biological processes when present in the genetic code.
The Role of the GBA Gene
The GBA gene provides the essential instructions for producing an enzyme called lysosomal acid glucosylceramidase. This enzyme resides within lysosomes, which are the recycling centers of our cells. Its primary job is to break down a fatty substance called glucocerebroside into simpler components that the cell can reuse. When the GBA gene functions correctly, this recycling process keeps cellular waste in check. However, when mutations like 84GG occur, the production of this enzyme is severely reduced or entirely eliminated. Without enough functional enzyme, the fatty substance glucocerebroside begins to accumulate within the lysosomes, eventually leading to the cellular dysfunction characteristic of Gaucher disease.
Research and Clinical Associations
Research has firmly established a link between the 84GG mutation and Gaucher disease, an autosomal recessive condition. Because it is recessive, an individual typically needs to inherit a pathogenic variant in both copies of the GBA gene—one from each parent—to manifest the clinical features of the disease. The evidence for this association is considered strong in clinical genetics. Individuals who carry only one copy of the mutation are generally referred to as carriers and typically do not exhibit the full symptoms of the disease. However, the presence of this variant is a significant finding in genetic screening, particularly for families with a history of lysosomal storage disorders, as it helps in understanding the risk of passing the condition to future generations.
Population Frequency
The 84GG mutation is considered rare in the general population. Historically, it has been identified as a significant mutation in individuals of Ashkenazi Jewish ancestry, where it accounts for a portion of the previously unidentified Gaucher disease-causing alleles. Because it is a rare variant, it is not typically found in the general screening of the broader population. Its distribution is highly specific to certain ancestral groups, which is why genetic counseling often focuses on family history and specific ethnic backgrounds when assessing the likelihood of carrying this particular mutation.
Interpreting Your Genetic Information
Understanding your genetic status regarding rs387906315 is a matter of clinical significance that should be handled with professional guidance. If you have received information about this variant, it is important to remember that genetic testing results are not a medical diagnosis. A laboratory report indicating the presence of this variant does not automatically mean you have or will develop Gaucher disease. If you are concerned about your carrier status or potential health risks, you should consult with a certified genetic counselor or a medical specialist. They can help interpret the results in the context of your personal and family health history and provide appropriate guidance on whether further clinical testing or family screening is necessary.
How common is this variant?
The 84GG mutation is rare in the general population but has been identified as a notable mutation in individuals of Ashkenazi Jewish ancestry.
Frequently asked questions
What is the 84GG mutation?
The 84GG mutation is a specific genetic insertion in the GBA gene. It disrupts the production of an enzyme needed to break down fats in the body.
Does having the 84GG mutation mean I have Gaucher disease?
Not necessarily. Gaucher disease is typically recessive, meaning it usually requires two copies of a pathogenic mutation. If you are a carrier, you should speak with a genetic counselor.
Is rs387906315 the same as 84GG?
Yes, rs387906315 is the official SNP identifier used in scientific databases for the mutation commonly known as 84GG.
Should I get tested for GBA mutations?
Genetic testing is a personal decision often guided by family history or clinical symptoms. You should discuss the benefits and limitations of testing with a healthcare provider.
Sources & further reading
Educational information only, last refreshed 9/24/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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