| OTOF | |||||||||||||||||||||||||||||||||||||||||||||||||||
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| Identifiers | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Aliases | OTOF , AUNB1, DFNB6, DFNB9, FER1L2, NSRD9, otoferlin | ||||||||||||||||||||||||||||||||||||||||||||||||||
| External IDs | OMIM: 603681 MGI: 1891247 HomoloGene: 12892 GeneCards: OTOF | ||||||||||||||||||||||||||||||||||||||||||||||||||
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| Wikidata | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Otoferlin is a protein that in humans is encoded by the OTOF gene. [5] [6] [7] It is involved in vesicle membrane fusion, and mutations in the OTOF gene are associated with a genetic form of deafness.
There are two forms of otoferlin protein. The short form of the protein has three C2 domains and a single carboxy-terminal transmembrane domain found also in the C. elegans spermatogenesis factor FER-1 and human dysferlin. The long form has six C2 domains.
Dysferlin and myoferlin are proteins found in humans that are homologous to otoferlin. Both dysferlin and myoferlin have seven C2 domains. A C2 domain is a protein structural domain involved in targeting proteins to cell membranes.
C2A in otoferlin's longer form, with six C2 domains, is structurally similar to dysferlin C2A. However, loop 1 in the calcium (Ca2+) binding site of otoferlin C2A is significantly shorter than the homologous loop in dysferlin and myoferlin C2A domains. Therefore, it is unable to bind to calcium. Otoferlin C2A is also unable to bind to phospholipids and hence it is structurally and functionally distinct from other C2 domains. [8] Nonetheless, the homology suggests that this protein may be involved in vesicle membrane fusion.
Similar to dysferlin and myoferlin, otoferlin has a FerA domain and its FerA domain has been shown to interact with zwitterionic lipids in a calcium-dependent manner and with negatively charged lipids in a calcium-independent manner. [9] The estimated charge of the FerA domain among ferlin proteins varies significantly. At pH 7, the estimated charge of dysferlin is -8.4 while otoferlin FerA is +8.5. [9] Several transcript variants encoding multiple isoforms have been found for this gene. [7]
Mutations in the gene encoding otoferlin are a cause of a neurosensory nonsyndromic recessive deafness, DFNB9. The diagnosis is identified by molecular genetic testing.
In October 2023 two small clinical trials for a gene therapy restoring the defective Otoferlin via an adeno-associated virus (AAVs) have been announced with good preliminary results. [10] [11]
Dysferlin also known as dystrophy-associated fer-1-like protein is a protein that in humans is encoded by the DYSF gene. Dysferlin is linked with plasma membrane repair., stabilization of calcium signaling and the development of the T-tubule system of the muscle A defect in the DYSF gene, located on chromosome 2p12-14, results in several types of muscular dystrophy; including Miyoshi myopathy (MM), Limb-girdle muscular dystrophy type 2B (LGMD2B) and Distal Myopathy (DM). A reduction or absence of dysferlin, termed dysferlinopathy, usually becomes apparent in the third or fourth decade of life and is characterised by weakness and wasting of various voluntary skeletal muscles. Pathogenic mutations leading to dysferlinopathy can occur throughout the DYSF gene.
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 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. The rRNA gene also encodes a peptide MOTS-c, also known as Mitochondrial-derived peptide MOTS-c or Mitochondrial open reading frame of the 12S rRNA-c.
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.
Cadherin-23 is a protein that in humans is encoded by the CDH23 gene.
Gap junction beta-6 protein (GJB6), also known as connexin 30 (Cx30) — is a protein that in humans is encoded by the GJB6 gene. Connexin 30 (Cx30) is one of several gap junction proteins expressed in the inner ear. Mutations in gap junction genes have been found to lead to both syndromic and nonsyndromic deafness. Mutations in this gene are associated with Clouston syndrome.
Mitochondrial import inner membrane translocase subunit Tim8 A, also known as deafness-dystonia peptide or protein is an enzyme that in humans is encoded by the TIMM8A gene. This translocase has similarity to yeast mitochondrial proteins that are involved in the import of metabolite transporters from the cytoplasm into the mitochondrial inner membrane. The gene is mutated in deafness-dystonia syndrome and it is postulated that MTS/DFN-1 is a mitochondrial disease caused by a defective mitochondrial protein import system.
Transmembrane protease, serine 3 is an enzyme that in humans is encoded by the TMPRSS3 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.
Myoferlin is a protein that in humans is encoded by the MYOF 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.
Otogelin is a protein that in humans is encoded by the OTOG gene.
Ferlins are an ancient protein family involved in vesicle fusion and membrane trafficking. Ferlins are distinguished by their multiple tandem C2 domains, and sometimes a FerA and a DysF domain. Mutations in ferlins can cause human diseases such as muscular dystrophy and deafness. Abnormalities in expression of myoferlin, a human ferlin protein, is also directly associated with higher mortality rate and tumor recurrence in several types of cancer, including pancreatic, colorectal, breast, cervical, stomach, ovarian, cervical, thyroid, endometrial, and oropharyngeal squamous cell carcinoma. In other animals, ferlin mutations can cause infertility.
Pejvakin is a protein that in humans is encoded by the PJVK gene.
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