Defective myosin VIIA gene responsible for Usher syndrome type IB
Abstract
Usher syndrome represents the association of a hearing impairment with retinitis pigmentosa and is the most frequent cause of deaf-blindness in humans. It is inherited as an autosomal recessive trait which is clinically and genetically heterogeneous. Some patients show abnormal organization of microtubules in the axoneme of their photoreceptors cells (connecting cilium), nasal ciliar cells and sperm cells, as well as widespread degeneration of the organ of Corti. Usher syndrome type 1 (USH1) is characterized by a profound congenital sensorineural hearing loss, constant vestibular dysfunction and prepubertal onset of retinitis pigmentosa. Of three different genes responsible for USH1. USH1B maps to 11q13.5 (ref. 10) and accounts for about 75% of USH1 patients. The mouse deafness shaker-1 (sh1) mutation has been localized to the homologous murine region. Taking into account the cytoskeletal abnormalities in USH patients, the identification of a gene encoding an unconventional myosin as a candidate for shaker-1 (ref. 14) led us to consider the human homologue as a good candidate for the gene that is defective in USH1B. Here we present evidence that a gene encoding myosin VIIA is responsible for USH1B. Two different premature stop codons, a six-base-pair deletion and two different missense mutations were detected in five unrelated families. In one of these families, the mutations were identified in both alleles. These mutations, which are located at the amino-terminal end of the motor domain of the protein, are likely to result in the absence of a functional protein. Thus USH1B appears as a primary cytoskeletal protein defect. These results implicate the genes encoding other unconventional myosins and their interacting proteins as candidates for other genetic forms of Usher syndrome.
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It seems likely that this deficiency in myosin-7a activity may contribute to the inherited blindness in Usher syndrome type 1B, which is caused by mutations in the human orthologue, MYO7A.
“It seems likely that this deficiency in myosin-7a activity may contribute to the inherited blindness in Usher syndrome type 1B, which is caused by mutations in the human orthologue, MYO7A (Weil et al., 1995).”
From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Weil et al., 1995
In humans, myosin-7a is encoded by the gene defective in Usher syndrome 1B.
“in humans, it is encoded by the gene that is defective in Usher syndrome 1B, a deaf-blindness disorder (Weil et al., 1995)”
From Microtubule motors transport phagosomes in the RPE, and lack of KLC1 leads to AMD-like pathogenesis (2015) · cites this paper as Weil et al., 1995
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- Authors
- Well, D., Blanchard, S., Kaplan, J., Guilford, P., Gibson, F., Walsh, J., Mburu, P., Varela, A., Levilliers, J., Weston, M. D., Kelley, P. M., Kimberling, W. J., Wagenaar, M., Levi-Acobas, F., Larget-Piet, D., Munnich, A., Steel, K. P., Brown, S. D. M., & Petit, C.
- Affiliations
- Centre National de la Recherche Scientifique (FR)
- Inserm (FR)
- St Mary's Hospital (GB)
- Boys Town National Research Hospital (US)
- Radboud University Nijmegen (NL)
- MRC Institute of Hearing Research (GB)
- Institut Pasteur (FR)
- ORCID
- Venue
- Nature
- Published
- 1995-03
- Volume
- 374
- Issue
- 6517
- Pages
- 60-61
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W2092670526
- Cited by
- 1,068
- References
- 30
- Citations by year
- 2026: 14 · 2025: 18 · 2024: 21 · 2023: 11 · 2022: 21 · 2021: 19 · 2020: 33 · 2019: 16 · 2018: 19 · 2017: 25 · 2016: 18 · 2015: 23 · 2014: 27 · 2013: 25 · 2012: 19
- FWCI
- 28.87
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion)
- Radboud Repository (Radboud University) (submittedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Kidney Cyst Diseases
- Life Sciences › Neuroscience › Sensory Systems › Hearing, Cochlea, Tinnitus, Genetics
- Keywords
- MYO7A, deafblindness, retinitis pigmentosa, sensorineural hearing loss, autosomal recessive inheritance, premature stop codon, missense mutations, motor domain, unconventional myosins, cytoskeletal defects, organ of Corti degeneration
- MeSH terms
- Adult, Amino Acid Sequence, Animals, Base Sequence, Child, Chromosomes, Human, Pair 11, Deafness, DNA, DNA Mutational Analysis, Female, Humans, Male, Molecular Sequence Data, Mutation, Myosins, Retinitis Pigmentosa, Swine, Syndrome, Sequence Homology, Amino Acid, Mice
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