Disease or Syndrome
Usher syndrome
[ uhsh-er sin-drohm, -druhm ]
Subclass of:
Sensorineural Hearing Loss (disorder);
Deaf-Blind Disorders;
Retinitis Pigmentosa
Definitions related to usher syndrome:
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A rare, autosomal recessive inherited syndrome caused by mutations in the CDH23, CLRN1, GPR98, MYO7A, PCDH15, USH1C, USH1G, and USH2A genes. It is characterized by hearing loss or deafness and progressive loss of vision. The loss of vision is the result of retinitis pigmentosa.NCI ThesaurusU.S. National Cancer Institute, 2021
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Hereditary disorder believed to occur in two forms: (1) characterized by congenital deafness and severe retinitis pigmentosa, and (2) in which the inner ear and retina are less severely affected; most cases are transmitted as autosomal recessive trait, but some forms are X-linked.CRISP ThesaurusNational Institutes of Health, 2006
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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. Researchers have identified three major types of Usher syndrome, designated as types I, II, and III. These types are distinguished by the severity of hearing loss, the presence or absence of balance problems, and the age at which signs and symptoms appear. The types are further divided into subtypes based on their genetic cause. Most individuals with Usher syndrome type I are born with severe to profound hearing loss. Worsening vision loss caused by retinitis pigmentosa becomes apparent in childhood. This type of Usher syndrome also causes abnormalities of the vestibular system, which is the part of the inner ear that helps maintain...MedlinePlus GeneticsU.S. National Library of Medicine, 2021
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Usher syndrome is an inherited disease that causes serious hearing loss and retinitis pigmentosa, an eye disorder that causes your vision to get worse over time. It is the most common condition that affects both hearing and vision. There are three types of Usher syndrome: People with type I are deaf from birth and have severe balance problems from a young age. Vision problems usually start by age 10 and lead to blindness.; People with type II have moderate to severe hearing loss and normal balance. Vision problems start in the early teens and get worse more slowly than in type I.; People with type III are born with normal hearing and near-normal balance but develop vision problems and then hearing loss. There is no cure. Tools such as hearing aids or cochlear implants can help some people. Training such as Braille instruction, low-vision services, or auditory training can also help. NIH: National Institute on Deafness and Other Communication DisordersMedlinePlusU.S. National Library of Medicine, 2021
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Autosomal recessive hereditary disorders characterized by congenital SENSORINEURAL HEARING LOSS and RETINITIS PIGMENTOSA. Genetically and symptomatically heterogeneous, clinical classes include type I, type II, and type III. Their severity, age of onset of retinitis pigmentosa and the degree of vestibular dysfunction are variable.NLM Medical Subject HeadingsU.S. National Library of Medicine, 2021
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Usher syndrome is a genetic disorder characterized by sensorineural hearing loss or deafness and progressive vision loss due to retinitis pigmentosa. Sensorineural hearing means it is caused by abnormalities of the inner ear. Retinitis pigmentosa is an eye disease that affects the layer of light-sensitive tissue at the back of the eye...National Center for Advancing Translational Sciences
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