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Usher Syndrome Type 3B

USH3B


Presentation

  • Acronym USH3B Keywords Any medical or genetic information present in this entry is provided for research, educational and informational purposes only.[uniprot.org]
  • Over several years the blinds spots get bigger, and more develop until a ring-shaped blind spot is present.[dbproject.mn.org]
  • Reading Comprehension: Gates MacGinitie This test was presented in text on screen. Short passages of text on different subjects are presented.[journal.frontiersin.org]
  • In each case, the corresponding normal graph (wt) is presented in parallel.[docplayer.net]
  • Constant vestibular dysfunction is present from birth; children have delays in motor development and begin sitting independently and walking later than usual.[centogene.com]
Progressive Hearing Loss
  • USH3 is characterized by postlingual, progressive hearing loss, variable vestibular dysfunction, and onset of retinitis pigmentosa symptoms, including nyctalopia, constriction of the visual fields, and loss of central visual acuity, usually by the second[uniprot.org]
  • Usher syndrome type III is characterized by postlingual, progressive hearing loss, variable vestibular dysfunction, and onset of retinitis pigmentosa symptoms, including nyctalopia, constriction of the visual fields, and loss of central visual acuity,[ncbi.nlm.nih.gov]
  • Progressive hearing loss is characteristic of USH3. Elsewhere USH3 has been regarded as a rarity covering only several percent of the whole Usher population.[link.springer.com]
  • People with Usher syndrome type III experience progressive hearing loss and vision loss beginning in the first few decades of life, according to Genetics Home Reference.[collive.com]
Loss of Peripheral Vision
  • RP causes nightblindness and a loss of peripheral vision through the progressive degeneration of the retina.[sense.org.uk]
  • RP causes night-blindness and a loss of peripheral vision (side vision) through the progressive degeneration of the retina. The retina is a light-sensitive tissue at the back of the eye and is crucial for vision.[news-medical.net]
  • Loss of vision [ 4 ] usually starts with night blindness and this is followed by loss of peripheral vision. Some degree of tunnel vision can continue until quite late.[patient.info]
  • In adolescence, people with Usher syndrome type 1F develop retinitis pigmentosa, an eye disease which causes night blindness and a gradual loss of peripheral vision. Eventually only the central vision remains, creating “tunnel vision.”[jscreen.org]
  • Retinitis pigmentosa causes night-blindness and a loss of peripheral vision (side vision) through the progressive degeneration of the retina. The retina is a light-sensitive tissue at the back of the eye and is crucial for vision.[pvfla.org]
Visual Acuity Decreased
  • All three types are inherited in an autosomal recessive manner. 0000662 Reduced visual acuity Decreased clarity of vision 0007663 Rod-cone dystrophy 0000510 Showing of 7 Last updated: 5/1/2019 Usher syndrome is inherited in an autosomal recessive manner[rarediseases.info.nih.gov]
Visual Hallucination
  • Some patients have the so-called 'Charles Bonnet syndrome,' involving decreased visual acuity and vivid visual hallucinations.[uniprot.org]
  • Some patients have the so-called Charles Bonnet syndrome, involving decreased visual acuity and vivid visual hallucinations.[genecards.org]
Areflexia
  • Three clinical entities have been defined: type 1 (around 40% of cases), in which hearing loss is congenital, profound, nonprogressive, and typically associated with vestibular areflexia leading to delayed acquisitions (delayed head control and unassisted[orpha.net]
  • […] problems often begin in teens Vestibular function Balance problems from birth Normal Normal to near-normal, chance of later problem Usher syndrome type I (USH1) is the most severe form, characterized by severe to profound congenital deafness, vestibular areflexia[centogene.com]
  • Type 1 (USH1) accounts for almost 40% of cases and is the most severe form, characterized by severe to profound congenital deafness, vestibular areflexia, and prepubertal onset of progressive RP.[blueprintgenetics.com]
  • […] majority of Usher syndrome cases can be clinically classified into three subtypes. 3, 4 USH type I (USH1; OMIM 276900, 276903, 276904, 601067, 602097, 602083 and 606943) is characterised by profound prelingual sensorineural hearing loss, vestibular areflexia[jmg.bmj.com]

Treatment

  • It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. Our staff consists of biologists and biochemists that are not trained to give medical advice .[uniprot.org]
  • Treatment options Currently, there are only insufficient and experimental treatment options available for the degeneration of the retina. They all aim at delaying the complete destruction of the photoreceptors.[hear.com]
  • Treatment for Usher Syndrome There is no cure for Usher syndrome. However, you can aim treatment for Usher syndrome to manage symptoms.[verywell.com]
  • RPB grants 500,000 to accelerate treatments for Retinitis Pigmentosa Research to Prevent Blindness (RPB), the leading eye research foundation, is providing 500,000 to accelerate the development of treatments for Retinitis Pigmentosa (RP) -- a family of[news-medical.net]

Prognosis

  • Prognosis The prognosis mainly depends on the progression of the visual loss: blindness occurs in almost all cases between 50 and 70 years of age. The documents contained in this web site are presented for information purposes only.[orpha.net]
  • Life Expectancy Prognosis for patients with Usher Syndrome is good. The condition will eventually lead to deafness and blindness, in most cases, but early death is not predicted in severe, moderate or mild cases.[babymed.com]
  • What is the prognosis for a person with Usher Syndrome Type 1F? Usher syndrome type 1F causes severe hearing and vision impairment, however it does not affect one’s lifespan or intelligence.[jscreen.org]
  • Although N48K mutation testing will be an excellent diagnostic tool for USH3 in Ashkenazi Jews, it will be less useful for predicting clinical prognosis due to the highly variable expressivity that we observed.[jmg.bmj.com]
  • […] third decade) Visual field loss Appears mid-childhood Less than 20 degrees probable by mid 20's Slower, but legal blindness probable at some point Central visual acuity Progressive loss with early development of cataracts Less severe but great variation Prognosis[tsbvi.edu]

Etiology

  • Etiology So far, mutations in five genes ( MYO7A , USH1C , CDH23 , PCDH15 , USH1G ) and one locus ( USH1E ) have been implicated in US type 1.[orpha.net]
  • Since they thought the etiology of the hearing loss was Connexin 26, no one ever mentioned Usher or looked into it. At age 12, the female twin starting having difficulty with her night vision. She wore corrective lenses as well.[audiologyonline.com]
  • Nat Genet 15: Khoury MJ, Cordero JF, Greenberg F, James LM, Erickson JD A population study of the VACTERL association: evidence for its etiologic heterogeneity. Pediatrics 71: Kleinjan D-J, van Heyningen V Position effect in human genetic disease.[docplayer.net]
  • There can be several etiologies behind deafblindness, but Usher syndrome is one of the most common causes ( Pennings, 2004 ; Sadeghi, 2005 ).[journal.frontiersin.org]

Epidemiology

  • Summary Epidemiology Prevalence is estimated at 1/30,000. US is the most common cause of hereditary combined deafness-blindness. Clinical description Onset usually occurs during childhood.[orpha.net]
  • Epidemiology The incidence is about 1 in 25,000. About 3-6% of hearing impaired children have the condition. Types 1 and 2 are more common than type 3 and together account for 90-95% of Usher's syndrome and about 10% of all children born deaf.[patient.info]
  • Relevant External Links for USH1C Genetic Association Database (GAD) USH1C Human Genome Epidemiology (HuGE) Navigator USH1C Atlas of Genetics and Cytogenetics in Oncology and Haematology: USH1C No data available for Genatlas for USH1C Gene A defect in[genecards.org]
  • Larger cohorts will be needed to determine if our findings accurately reflect the epidemiology of Usher syndrome in the Ashkenazi Jewish population. We identified an N48K carrier frequency of 0.7% in Ashkenazi Jewish control DNA samples.[jmg.bmj.com]
  • The prevalence of Usher Syndrome in Sweden: a nationwide epidemiological and clinical survey. Audiol. Med. 2, 220–228. doi: 10.1080/16513860410003093 CrossRef Full Text Google Scholar Schaffner, E., and Schiefele, U. (2013).[journal.frontiersin.org]
Sex distribution
Age distribution

Prevention

  • However, early diagnosis is important in order to attenuate the far-reaching consequences of this condition and to take preventative measures.[hear.com]
  • Foundation Fighting Blindness homepage The urgent mission of the Foundation Fighting Blindness is to drive the research that will provide preventions, treatments and cures for people affected by retinitis pigmentosa, age-related macular degeneration,[blindness.org]
  • Accessible Hours : Mon-Fri 9am-5pm * closed for lunch 12noon-1pm Public Contacts : Gilles Charette - Executive Director Service Description : Information and resources about HIV (human immunodeficiency virus) and AIDS (acquired immunodeficiency syndrome) * prevention[southeasthealthline.ca]
  • Opening doors and changing lives since 1988 OUR MISSION HIV/AIDS Regional Services provides comprehensive services including education, prevention and support for people living with, at risk of, or affected by HIV/AIDS, STBBI’s in addition to advocating[hars.ca]
  • RPB grants 500,000 to accelerate treatments for Retinitis Pigmentosa Research to Prevent Blindness (RPB), the leading eye research foundation, is providing 500,000 to accelerate the development of treatments for Retinitis Pigmentosa (RP) -- a family of[news-medical.net]

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