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Usher syndrome, type 4(USH4)

MedGen UID:
1648315
Concept ID:
C4748364
Disease or Syndrome
Synonym: USHER SYNDROME, TYPE IV
 
Gene (location): ARSG (17q24.2)
 
Monarch Initiative: MONDO:0029141
OMIM®: 618144

Definition

An atypical form of Usher syndrome, here designated type IV (USH4), is an autosomal recessive disorder characterized by late onset of retinitis pigmentosa and usually late-onset of progressive sensorineural hearing loss without vestibular involvement (summary by Khateb et al., 2018). For a discussion of genetic heterogeneity of Usher syndrome, see 276900. [from OMIM]

Clinical features

From HPO
Sensorineural hearing loss disorder
MedGen UID:
9164
Concept ID:
C0018784
Disease or Syndrome
A type of hearing impairment in one or both ears related to an abnormal functionality of the cochlear nerve.
Progressive sensorineural hearing impairment
MedGen UID:
335894
Concept ID:
C1843156
Disease or Syndrome
A progressive form of sensorineural hearing impairment.
Abnormal vestibular function
MedGen UID:
334848
Concept ID:
C1843865
Finding
An abnormality of the functioning of the vestibular apparatus.
Night blindness
MedGen UID:
10349
Concept ID:
C0028077
Disease or Syndrome
Inability to see well at night or in poor light.
Retinal degeneration
MedGen UID:
48432
Concept ID:
C0035304
Finding
A nonspecific term denoting degeneration of the retinal pigment epithelium and/or retinal photoreceptor cells.
Constriction of peripheral visual field
MedGen UID:
68613
Concept ID:
C0235095
Finding
An absolute or relative decrease in retinal sensitivity extending from edge (periphery) of the visual field in a concentric pattern. The visual field is the area that is perceived simultaneously by a fixating eye.
Ring scotoma
MedGen UID:
140951
Concept ID:
C0438434
Finding
An annular field defect centered on fixation.
Retinal atrophy
MedGen UID:
101075
Concept ID:
C0521694
Disease or Syndrome
Well-demarcated area(s) of partial or complete depigmentation in the fundus, reflecting atrophy of the retinal pigment epithelium with associated retinal photoreceptor loss.
Bone spicule pigmentation of the retina
MedGen UID:
323029
Concept ID:
C1836926
Finding
Pigment migration into the retina in a bone-spicule configuration (resembling the nucleated cells within the lacuna of bone).
Hyperautofluorescent macular lesion
MedGen UID:
893119
Concept ID:
C4073101
Finding
Increased amount of autofluorescence in the macula as ascertained by fundus autofluorescence imaging.

Professional guidelines

PubMed

Stephenson KAJ, Whelan L, Zhu J, Dockery A, Wynne NC, Cairns RM, Kirk C, Turner J, Duignan ES, O'Byrne JJ, Silvestri G, Kenna PF, Farrar GJ, Keegan DJ
Invest Ophthalmol Vis Sci 2023 Jul 3;64(10):23. doi: 10.1167/iovs.64.10.23. PMID: 37466950Free PMC Article
Zaw K, Carvalho LS, Aung-Htut MT, Fletcher S, Wilton SD, Chen FK, McLenachan S
Asia Pac J Ophthalmol (Phila) 2022 Jul-Aug 01;11(4):369-379. Epub 2022 Aug 17 doi: 10.1097/APO.0000000000000546. PMID: 36041150
Molina-Ramírez LP, Lenassi E, Ellingford JM, Sergouniotis PI, Ramsden SC, Bruce IA, Black GCM
Otol Neurotol 2020 Apr;41(4):431-437. doi: 10.1097/MAO.0000000000002588. PMID: 32176120

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