Learn About Usher Syndrome

What is the definition of Usher Syndrome?

Usher syndrome is a condition characterized by partial or total hearing loss and vision loss that worsens over time. The hearing loss is classified as sensorineural, which means that it is caused by abnormalities of the inner ear. The loss of vision is caused by an eye disease called retinitis pigmentosa (RP), which affects the layer of light-sensitive tissue at the back of the eye (the retina). Vision loss occurs as the light-sensing cells of the retina gradually break down. Loss of night vision begins first, followed by blind spots that develop in the side (peripheral) vision. Over time, these blind spots enlarge and merge to produce tunnel vision. In some cases, vision is further impaired by clouding of the lens of the eye (cataracts). However, many people with retinitis pigmentosa retain some central vision throughout their lives.

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What are the causes of Usher Syndrome?

Usher syndrome can be caused by mutations in several different genes. Mutations in at least six genes can cause Usher syndrome type I. The most common of these are MYO7A gene mutations, followed by mutations in the CDH23 gene. Usher syndrome type II can result from mutations in three genes; USH2A gene mutations account for most cases of type II. Usher syndrome type III is most often caused by mutations in the CLRN1 gene.

How prevalent is Usher Syndrome?

Usher syndrome affects around 4 to 17 in 100,000 people. Types I and II are the most common forms of Usher syndrome in most countries. Certain genetic mutations resulting in type 1 Usher syndrome are more common among people of Ashkenazi (eastern and central European) Jewish or French Acadian heritage than in the general population.

Is Usher Syndrome an inherited disorder?

All of the types of Usher syndrome are inherited in an autosomal recessive pattern, which means both copies of a gene in each cell have a mutation. The parents of an individual with Usher syndrome each carry one copy of the mutated gene, but they do not have any signs and symptoms of the condition.

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What are the latest Usher Syndrome Clinical Trials?
Adaptive Optics Imaging of Outer Retinal Diseases

Summary: The objective of the study is to collect adaptive optics (AO) retinal images from human subjects with outer retinal diseases (diseases of the outer retina including photoreceptor, retinal pigment epithelium (RPE), basement membrane or choroidal pathologies) to develop new diagnostic methods, biomarkers, and clinical endpoints.

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Natural History Study of Usher Syndrome in a Cohort of Patients Followed Longitudinally for 5 Years

Summary: Clinical centres in the LIGHT4DEAF consortium have developed and will continue to improve a reliable, early molecular diagnosis and protocols for full clinical characterisation of Usher syndrome, which will be valuable for the foreseen USH clinical trials. The clinical arm of the project aims at performing a deep-phenotyping of retinal degeneration, hearing loss, vestibular dysfunction, neurocogni...

Who are the sources who wrote this article ?

Published Date: May 17, 2021Published By: National Institutes of Health

What are the Latest Advances for Usher Syndrome?
The First Epiretinal Implant for Hereditary Blindness in the Asia-Pacific Region.
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Genetic diagnosis of a pedigree affected with Usher syndrome type 1D/F.