09/04/2026
Usher syndrome can show up in a family with zero history of it. Here’s why.
The answer is in how it’s passed down.
Most Usher syndrome cases are inherited in an autosomal recessive pattern. This means a person usually needs two changed copies of the same USH gene to have Usher syndrome, one from each parent.
A person with just one changed copy is called a carrier. Carriers usually don’t have symptoms, so many people have no idea they’re carriers.
If both parents are carriers of changes in the same USH gene, each pregnancy has:
a 1-in-4 chance that the child will have Usher syndrome
a 1-in-2 chance that the child will be a carrier
a 1-in-4 chance that the child will inherit neither changed copy
Those chances start over with each pregnancy.
That’s how Usher syndrome can appear in a family even when no one else is known to have it.
Nobody did anything wrong. It’s simply how genes can be passed down. Understanding how it works can bring clarity and help families make informed choices about what comes next.
Next Friday: What actually happens when you get a genetic test?
ID: Graphic with white background, bold navy text, DNA helix images upper right and lower left. USH logo bottom right.