Monogenic hearing loss

Gene: SLITRK6

Green List (high evidence)

The rating of this gene has been updated following NHS Genomic Medicine Service approval.

Created: 3 Mar 2022, 1:19 p.m. | Last Modified: 3 Mar 2022, 1:19 p.m.

Panel Version: 2.221

Comment on list classification: Promoting this gene from red to amber but with a recommendation for a green rating following GMS review.

Created: 4 Nov 2020, 12:33 p.m. | Last Modified: 4 Nov 2020, 12:33 p.m.

Panel Version: 2.101

Associated with Deafness and myopia #221200 (AR) in OMIM.

PMID: 29551497 - Salime et al 2018 - report a consanguineous Moroccan family with 2 children diagnosed for deafness and myopia in infancy. The SLITRK6 was sequenced and a homozygous 1 bp deletion leading to a premature stop codon p.Trp232Cysfs*10 was found. The parents were heterozygous for the variant as were 3 unaffected siblings.

PMID: 23946138 - Morlet et al 2014 - report 9 Old Order Amish individuals who were homozygous for a nonsense mutation of SLITRK6 (c.1240C>T, p.Gln414Ter) and suffered progressive cochlear and auditory nerve dysfunction

PMID: 23543054 - Tekin et al 2013 - report 3 families (1 old-order Amish family, 1 consanguineous Turkish and 1 Greek).
The Amish and Turkish families had members with congenital myopia and prelingual sensorineural hearing loss, while the affected Greek family had hearing loss only. Homozygous nonsense variants were found in SLITRK6 in all 3 families (Amish p.Q414X, Turkish p.S297X, Greek p.R181X). WES was performed on the Turkish family, targeted sequencing in a region of autozygosity in the Amish family, and targeted SLITRK6 sequencing in the Greek family in which affected members had the same haplotype in that region. Mouse Slitrk6 KO show a hearing loss phenotype.

Summary: founder mutation in SLITRK6 in several Amish families, plus 3 other variants reported in families of other ethnicities. Mouse model shows hearing loss phenotype.

Created: 4 Nov 2020, 12:28 p.m. | Last Modified: 4 Nov 2020, 12:29 p.m.

Panel Version: 2.98

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Deafness and myopia, 221200; high myopia-sensorineural deafness syndrome MONDO:0009082

Publications

• 29551497
• 23946138
• 23543054

Green List (high evidence)

Multiple Amish families reported segregating a founder mutation; recent report of another non-Amish family with different variant; mouse model supports gene-disease association. Green or Amber?

Created: 29 Jan 2020, 6:18 a.m. | Last Modified: 29 Jan 2020, 6:18 a.m.

Panel Version: 2.4

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Deafness and myopia, MIM#221200

Publications

• 23543054
• 29551497

Variants in this GENE are reported as part of current diagnostic practice

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
#221200:Deafness and myopia[Hearing loss, prelingual sensorineural, moderate to severeSymmetric deterioration of hearing loss and speech reception with ageSevere to profound hearing impairment by early adulthoodAbsent distortion product otoacoustic emissions (OAEs)Absent ipsilateral middle ear muscle reflexes (in older patients)Increase in amplitude and duration of cochlear microphonic (CM) (in young patients)Absent cochlear microphonic (in older patients)Bilateral dys-synchronized auditory brainstem responsesNo reproducible waves I, III, or V at high intensitiesAbsence of vestibular evoked myogenic potentials (rare); High myopia; Caused by mutation in the SLIT- and NTRK-like family, member-6 gene (SLITRK6,)]

Publications

• PMID:14550773
• 14557068
• 21298075
• 23543054