Cadherin-23 is a protein that in humans is encoded by the CDH23 gene. [5] [6] [7]
This gene is a member of the cadherin superfamily, genes encoding calcium dependent cell-cell adhesion glycoproteins. The protein encoded by this gene is a large, single-pass transmembrane protein composed of an extracellular domain containing 27 repeats that show significant homology to the cadherin ectodomain. Expressed in the neurosensory epithelium, the protein is thought to be involved in stereocilia organization and hair bundle formation. Specifically, it is thought to interact with protocadherin 15 to form tip-link filaments. [8]
The gene is located in a region containing the human deafness loci DFNB12 and USH1D. Usher syndrome 1D and nonsyndromic autosomal recessive deafness DFNB12 are caused by allelic mutations of this novel cadherin-like gene. [7] [9] The gene is associated with kidney function decline. [10]
Usher syndrome, also known as Hallgren syndrome, Usher–Hallgren syndrome, retinitis pigmentosa–dysacusis syndrome or dystrophia retinae dysacusis syndrome, is a rare genetic disorder caused by a mutation in any one of at least 11 genes resulting in a combination of hearing loss and visual impairment. It is a major cause of deafblindness and is at present incurable.
Pendrin is an anion exchange protein that in humans is encoded by the SLC26A4 gene . Pendrin was initially identified as a sodium-independent chloride-iodide exchanger with subsequent studies showing that it also accepts formate and bicarbonate as substrates. Pendrin is similar to the Band 3 transport protein found in red blood cells. Pendrin is the protein which is mutated in Pendred syndrome, which is an autosomal recessive disorder characterized by sensorineural hearing loss, goiter and a partial organification problem detectable by a positive perchlorate test.
Myosin VIIA is protein that in humans is encoded by the MYO7A gene. Myosin VIIA is a member of the unconventional myosin superfamily of proteins. Myosins are actin binding molecular motors that use the enzymatic conversion of ATP - ADP + inorganic phosphate (Pi) to provide the energy for movement.
Gap junction beta-2 protein (GJB2), also known as connexin 26 (Cx26) — is a protein that in humans is encoded by the GJB2 gene.
Mitochondrially encoded 12S ribosomal RNA, also known as Mitochondrial-derived peptide MOTS-c or Mitochondrial open reading frame of the 12S rRNA-c is the SSU rRNA of the mitochondrial ribosome. In humans, 12S is encoded by the MT-RNR1 gene and is 959 nucleotides long. MT-RNR1 is one of the 37 genes contained in animal mitochondria genomes. Their 2 rRNA, 22 tRNA and 13 mRNA genes are very useful in phylogenetic studies, in particular the 12S and 16S rRNAs. The 12S rRNA is the mitochondrial homologue of the prokaryotic 16S and eukaryotic nuclear 18S ribosomal RNAs. Mutations in the MT-RNR1 gene may be associated with hearing loss.
Usherin is a protein that in humans is encoded by the USH2A gene.
Harmonin is a protein that in humans is encoded by the USH1C gene. It is expressed in sensory cells of the inner ear and retina, where it plays a role in hearing, balance, and vision. Mutations at the USH1C locus cause Usher syndrome type 1c and nonsyndromic sensorineural deafness.
Protocadherin-15 is a protein that in humans is encoded by the PCDH15 gene.
Usher syndrome type-1G protein is a protein that in humans is encoded by the USH1G gene.
Transmembrane protease, serine 3 is an enzyme that in humans is encoded by the TMPRSS3 gene.
Whirlin is a protein that in humans is encoded by the DFNB31 gene.
TRIO and F-actin-binding protein is a protein that in humans is encoded by the TRIOBP gene.
Alpha-tectorin is a protein that in humans is encoded by the TECTA gene.
Protein SGT1 is a protein that in humans is encoded by the ECD gene.
Otoferlin is a protein that in humans is encoded by the OTOF gene.
Transmembrane channel-like protein 1 is a protein that in humans is encoded by the TMC1 gene. TMC1 contains six transmembrane domains with both the C and N termini on the endoplasmic side of the membrane, as well as a large loop between domains 4 and 5. This topology is similar to that of transient receptor potential channels (TRPs), a family of proteins involved in the perception of senses such as temperature, taste, pressure, and vision. TMC1 has been located in the post-natal mouse cochlea, and knockouts for TMC1 and TMC2 result in both auditory and vestibular deficits indicating TMC1 is a molecular part of auditory transduction.
Myosin-XV is a protein that in humans is encoded by the MYO15A gene.
Lipoxygenase homology domains 1 is a protein in humans that is encoded by the LOXHD1 gene.
Leucine rich transmembrane and O-methyltransferase domain containing is a protein that in humans is encoded by the LRTOMT gene.
Pejvakin is a protein that in humans is encoded by the PJVK gene.