USH1C gene

Overview

Gene (OMIM No.)
Function of gene/protein
  • PDZ-domain containing protein
  • Scaffolding protein for Usher protein networks in the inner ear hair cells and retinal photoreceptors
  • Required for normal development and function of the hair cell stereocilia
Clinical phenotype
(OMIM phenotype no.)
Inheritance
  • Autosomal recessive
Ocular features
Visual functionUsher syndrome
  • Nyctalopia with pre-adolescent onset
  • Peripheral visual field loss
  • Loss of central and colour vision in later life
Systemic features
  • Congenital, bilateral, severe to profound sensorineural hearing loss
  • Failed newborn hearing screen or hearing difficulties suspected in infancy
  • Vestibular dysfunction affecting balance from birth
Key investigations
  • Newborn hearing screen – otoacoustic emission and automated auditory brainstem response
  • Pure tone audiometry
  • Electrophysiology
  • Fundus autofluorescence (FAF): a ring of hyper-AF in the macula
  • Optical coherence tomography (OCT): progressive loss of outer retinal structures which spares the fovea initially; cystoid macular oedema may be detected
  • Kinetic perimetry
Molecular diagnosisNext generation sequencing
  • Targeted gene panels (retinal and deafness)
  • Whole exome sequencing
  • Whole genome sequencing
  • Targeted exome sequencing
Management
Therapies under research
Further information

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Additional information

USH1C mutations cause Usher syndrome type 1C[8,9] and autosomal recessive non-syndromic hearing loss (DFNB18).[10] Variants that cause DFNB18, which include a leaky splice site mutation IVS12+5G>C, have been proposed to have a less deleterious effect as they located within alternatively spliced exons.[10,11]

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References

  1.  Pan B, Askew C, Galvin A, et al. Gene therapy restores auditory and vestibular function in a mouse model of Usher syndrome type 1c. Nat Biotechnol. 2017;35(3):264-272
  2.  Overlack N, Goldmann T, Wolfrum U, Nagel-Wolfrum K. Gene repair of an Usher syndrome causing mutation by zinc-finger nuclease mediated homologous recombination. Invest Ophthalmol Vis Sci. 2012;53(7):4140-4146
  3.  Goldmann T, Rebibo-Sabbah A, Overlack N, et al. Beneficial read-through of a USH1C nonsense mutation by designed aminoglycoside NB30 in the retina. Invest Ophthalmol Vis Sci. 2010;51(12):6671-6680
  4.  Goldmann T, Overlack N, Moeller F, et al. A comparative evaluation of NB30, NB54 and PTC124 in translational read-through efficacy for treatment of an USH1C nonsense mutation. EMBO Mol Med. 2012;4(11):1186-1199
  5.  Lentz JJ, Jodelka FM, Hinrich AJ, et al. Rescue of hearing and vestibular function by antisense oligonucleotides in a mouse model of human deafness. Nat Med. 2013;19(3):345-350
  6.  Depreux FF, Wang L, Jiang H, et al. Antisense oligonucleotides delivered to the amniotic cavity in utero modulate gene expression in the postnatal mouse. Nucleic Acids Res. 2016;44(20):9519-9529
  7.  Wang L, Kempton JB, Jiang H, et al. Fetal antisense oligonucleotide therapy for congenital deafness and vestibular dysfunction. Nucleic Acids Res. 2020
  8.  Bitner-Glindzicz M, Lindley KJ, Rutland P, et al. A recessive contiguous gene deletion causing infantile hyperinsulinism, enteropathy and deafness identifies the Usher type 1C gene. Nat Genet. 2000;26(1):56-60
  9.  Verpy E, Leibovici M, Zwaenepoel I, et al. A defect in harmonin, a PDZ domain-containing protein expressed in the inner ear sensory hair cells, underlies Usher syndrome type 1C. Nat Genet. 2000;26(1):51-55
  10.  Ahmed ZM, Smith TN, Riazuddin S, et al. Nonsyndromic recessive deafness DFNB18 and Usher syndrome type IC are allelic mutations of USHIC. Hum Genet. 2002;110(6):527-531
  11.  Ouyang XM, Xia XJ, Verpy E, et al. Mutations in the alternatively spliced exons of USH1C cause non-syndromic recessive deafness. Hum Genet. 2002;111(1):26-30

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Updated on November 30, 2020

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