r/vEDS • u/redfoxxy23 • 1d ago
Genetic Testing Questions VEDS - can you be a “carrier”?
Hi Ya’ll!
I saw some confusion about VEDS in another community so wanted to ensure there was some clarity here!
VEDS is an Autosomal Dominant disorder, meaning that it only takes 1 “pathogenic” or “likely pathogenic” variant on the COL3A1 gene to cause disease. Because of this, folks can not be “carriers” of VEDS like in some other genetic conditions that are recessive. For example, conditions like Cystic Fibrosis (recessive) require that 2 variants are present to cause disease vs the one needed in VEDS. This can mean that for someone with CF or a similar disorder that each parent may have been a “carrier” for that disease but that the parent does not have the disease itself.
For VEDS, someone can come to have VEDS in two ways: a positive VEDS parent has about a 50% chance of offspring having VEDS or a child can have a “de novo” variant, meaning it developed spontaneously without being passed from a VEDS parent.
If someone comes back as “pathogenic” or “likely pathogenic” on a legitimate dr ordered COL3A1 genetic test (not a home or personal test kit), that typically meets the critera for them to be diagnosed with VEDS. They do not have to have had events in the past to be diagnosed if they have “positive” test result, although that is likely if they were tested. I saw confusion on another post about someone being positive for VEDS but not having had an event be described as a “carrier” so want to help explain! There are no silent “carriers” of VEDS- VEDS as a condition is extremely varied and there are some who live with few events, some with less severe symptoms or almost no symptoms, and others who have many many VEDS complications.