HOMER2, a stereociliary scaffolding protein, is essential for normal hearing in humans and mice.
Hereditary hearing loss is a clinically and genetically heterogeneous disorder. More than 80 genes have been implicated to date, and with the advent of targeted genomic enrichment and massively parallel sequencing (TGE+MPS) the rate of novel deafness-gene identification has accelerated. Here we repo...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2015-03-01
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| Series: | PLoS Genetics |
| Online Access: | http://europepmc.org/articles/PMC4376867?pdf=render |
| _version_ | 1811201588167966720 |
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| author | Hela Azaiez Amanda R Decker Kevin T Booth Allen C Simpson A Eliot Shearer Patrick L M Huygen Fengxiao Bu Michael S Hildebrand Paul T Ranum Seiji B Shibata Ann Turner Yuzhou Zhang William J Kimberling Robert A Cornell Richard J H Smith |
| author_facet | Hela Azaiez Amanda R Decker Kevin T Booth Allen C Simpson A Eliot Shearer Patrick L M Huygen Fengxiao Bu Michael S Hildebrand Paul T Ranum Seiji B Shibata Ann Turner Yuzhou Zhang William J Kimberling Robert A Cornell Richard J H Smith |
| author_sort | Hela Azaiez |
| collection | DOAJ |
| description | Hereditary hearing loss is a clinically and genetically heterogeneous disorder. More than 80 genes have been implicated to date, and with the advent of targeted genomic enrichment and massively parallel sequencing (TGE+MPS) the rate of novel deafness-gene identification has accelerated. Here we report a family segregating post-lingual progressive autosomal dominant non-syndromic hearing loss (ADNSHL). After first excluding plausible variants in known deafness-causing genes using TGE+MPS, we completed whole exome sequencing in three hearing-impaired family members. Only a single variant, p.Arg185Pro in HOMER2, segregated with the hearing-loss phenotype in the extended family. This amino acid change alters a highly conserved residue in the coiled-coil domain of HOMER2 that is essential for protein multimerization and the HOMER2-CDC42 interaction. As a scaffolding protein, HOMER2 is involved in intracellular calcium homeostasis and cytoskeletal organization. Consistent with this function, we found robust expression in stereocilia of hair cells in the murine inner ear and observed that over-expression of mutant p.Pro185 HOMER2 mRNA causes anatomical changes of the inner ear and neuromasts in zebrafish embryos. Furthermore, mouse mutants homozygous for the targeted deletion of Homer2 present with early-onset rapidly progressive hearing loss. These data provide compelling evidence that HOMER2 is required for normal hearing and that its sequence alteration in humans leads to ADNSHL through a dominant-negative mode of action. |
| first_indexed | 2024-04-12T02:24:11Z |
| format | Article |
| id | doaj.art-3d71b5413dfb479d80203d8482249e74 |
| institution | Directory Open Access Journal |
| issn | 1553-7390 1553-7404 |
| language | English |
| last_indexed | 2024-04-12T02:24:11Z |
| publishDate | 2015-03-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS Genetics |
| spelling | doaj.art-3d71b5413dfb479d80203d8482249e742022-12-22T03:52:02ZengPublic Library of Science (PLoS)PLoS Genetics1553-73901553-74042015-03-01113e100513710.1371/journal.pgen.1005137HOMER2, a stereociliary scaffolding protein, is essential for normal hearing in humans and mice.Hela AzaiezAmanda R DeckerKevin T BoothAllen C SimpsonA Eliot ShearerPatrick L M HuygenFengxiao BuMichael S HildebrandPaul T RanumSeiji B ShibataAnn TurnerYuzhou ZhangWilliam J KimberlingRobert A CornellRichard J H SmithHereditary hearing loss is a clinically and genetically heterogeneous disorder. More than 80 genes have been implicated to date, and with the advent of targeted genomic enrichment and massively parallel sequencing (TGE+MPS) the rate of novel deafness-gene identification has accelerated. Here we report a family segregating post-lingual progressive autosomal dominant non-syndromic hearing loss (ADNSHL). After first excluding plausible variants in known deafness-causing genes using TGE+MPS, we completed whole exome sequencing in three hearing-impaired family members. Only a single variant, p.Arg185Pro in HOMER2, segregated with the hearing-loss phenotype in the extended family. This amino acid change alters a highly conserved residue in the coiled-coil domain of HOMER2 that is essential for protein multimerization and the HOMER2-CDC42 interaction. As a scaffolding protein, HOMER2 is involved in intracellular calcium homeostasis and cytoskeletal organization. Consistent with this function, we found robust expression in stereocilia of hair cells in the murine inner ear and observed that over-expression of mutant p.Pro185 HOMER2 mRNA causes anatomical changes of the inner ear and neuromasts in zebrafish embryos. Furthermore, mouse mutants homozygous for the targeted deletion of Homer2 present with early-onset rapidly progressive hearing loss. These data provide compelling evidence that HOMER2 is required for normal hearing and that its sequence alteration in humans leads to ADNSHL through a dominant-negative mode of action.http://europepmc.org/articles/PMC4376867?pdf=render |
| spellingShingle | Hela Azaiez Amanda R Decker Kevin T Booth Allen C Simpson A Eliot Shearer Patrick L M Huygen Fengxiao Bu Michael S Hildebrand Paul T Ranum Seiji B Shibata Ann Turner Yuzhou Zhang William J Kimberling Robert A Cornell Richard J H Smith HOMER2, a stereociliary scaffolding protein, is essential for normal hearing in humans and mice. PLoS Genetics |
| title | HOMER2, a stereociliary scaffolding protein, is essential for normal hearing in humans and mice. |
| title_full | HOMER2, a stereociliary scaffolding protein, is essential for normal hearing in humans and mice. |
| title_fullStr | HOMER2, a stereociliary scaffolding protein, is essential for normal hearing in humans and mice. |
| title_full_unstemmed | HOMER2, a stereociliary scaffolding protein, is essential for normal hearing in humans and mice. |
| title_short | HOMER2, a stereociliary scaffolding protein, is essential for normal hearing in humans and mice. |
| title_sort | homer2 a stereociliary scaffolding protein is essential for normal hearing in humans and mice |
| url | http://europepmc.org/articles/PMC4376867?pdf=render |
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