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Guillen‐Ahlers H, Erbe CB, Chevalier FD, Montoya MJ, Zimmerman KD, Langefeld CD, Olivier M, Runge CL. TMTC2 variant associated with sensorineural hearing loss and auditory neuropathy spectrum disorder in a family dyad. Mol Genet Genomic Med 2018; 6:653-659. [PMID: 29671961 PMCID: PMC6081214 DOI: 10.1002/mgg3.397] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 02/02/2018] [Accepted: 03/09/2018] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Sensorineural hearing loss (SNHL) is a common form of hearing loss that can be inherited or triggered by environmental insults; auditory neuropathy spectrum disorder (ANSD) is a SNHL subtype with unique diagnostic criteria. The genetic factors associated with these impairments are vast and diverse, but causal genetic factors are rarely characterized. METHODS A family dyad, both cochlear implant recipients, presented with a hearing history of bilateral, progressive SNHL, and ANSD. Whole-exome sequencing was performed to identify coding sequence variants shared by both family members, and screened against genes relevant to hearing loss and variants known to be associated with SNHL and ANSD. RESULTS Both family members are successful cochlear implant users, demonstrating effective auditory nerve stimulation with their devices. Genetic analyses revealed a mutation (rs35725509) in the TMTC2 gene, which has been reported previously as a likely genetic cause of SNHL in another family of Northern European descent. CONCLUSION This study represents the first confirmation of the rs35725509 variant in an independent family as a likely cause for the complex hearing loss phenotype (SNHL and ANSD) observed in this family dyad.
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Affiliation(s)
- Hector Guillen‐Ahlers
- Department of GeneticsTexas Biomedical Research InstituteSan AntonioTXUSA
- Present address:
Department of Internal MedicineSection of Molecular MedicineWake Forest University School of MedicineWinston‐SalemNCUSA
| | - Christy B. Erbe
- Department of Otolaryngology and Communication SciencesMedical College of WisconsinMilwaukeeWIUSA
| | | | - Maria J. Montoya
- Department of GeneticsTexas Biomedical Research InstituteSan AntonioTXUSA
| | - Kip D. Zimmerman
- Department of Biostatistical SciencesWake Forest University School of MedicineWinston‐SalemNCUSA
| | - Carl D. Langefeld
- Department of Biostatistical SciencesWake Forest University School of MedicineWinston‐SalemNCUSA
| | - Michael Olivier
- Department of GeneticsTexas Biomedical Research InstituteSan AntonioTXUSA
- Present address:
Department of Internal MedicineSection of Molecular MedicineWake Forest University School of MedicineWinston‐SalemNCUSA
| | - Christina L. Runge
- Department of Otolaryngology and Communication SciencesMedical College of WisconsinMilwaukeeWIUSA
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Runge CL, Indap A, Zhou Y, Kent JW, King E, Erbe CB, Cole R, Littrell J, Merath K, James R, Rüschendorf F, Kerschner JE, Marth G, Hübner N, Göring HHH, Friedland DR, Kwok WM, Olivier M. Association of TMTC2 With Human Nonsyndromic Sensorineural Hearing Loss. JAMA Otolaryngol Head Neck Surg 2017; 142:866-72. [PMID: 27311106 DOI: 10.1001/jamaoto.2016.1444] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
IMPORTANCE Sensorineural hearing loss (SNHL) is commonly caused by conditions that affect cochlear structures or the auditory nerve, and the genes identified as causing SNHL to date only explain a fraction of the overall genetic risk for this debilitating disorder. It is likely that other genes and mutations also cause SNHL. OBJECTIVE To identify a candidate gene that causes bilateral, symmetric, progressive SNHL in a large multigeneration family of Northern European descent. DESIGN, SETTING, AND PARTICIPANTS In this prospective genotype and phenotype study performed from January 1, 2006, through April 1, 2016, a 6-generation family of Northern European descent with 19 individuals having reported early-onset hearing loss suggestive of an autosomal dominant inheritance were studied at a tertiary academic medical center. In addition, 179 unrelated adult individuals with SNHL and 186 adult individuals reporting nondeafness were examined. MAIN OUTCOMES AND MEASURES Sensorineural hearing loss. RESULTS Nine family members (5 women [55.6%]) provided clinical audiometric and medical records that documented hearing loss. The hearing loss is characterized as bilateral, symmetric, progressive SNHL that reached severe to profound loss in childhood. Audiometric configurations demonstrated a characteristic dip at 1000 to 2000 Hz. All affected family members wear hearing aids or have undergone cochlear implantation. Exome sequencing and linkage and association analyses identified a fully penetrant sequence variant (rs35725509) on chromosome 12q21 (logarithm of odds, 3.3) in the TMTC2 gene region that segregates with SNHL in this family. This gene explains the SNHL occurrence in this family. The variant is also associated with SNHL in a cohort of 363 unrelated individuals (179 patients with confirmed SNHL and 184 controls, P = 7 × 10-4). CONCLUSIONS AND RELEVANCE A previously uncharacterized gene, TMTC2, has been identified as a candidate for causing progressive SNHL in humans. This finding identifies a novel locus that causes autosomal dominant SNHL and therefore a more detailed understanding of the genetic basis of SNHL. Because TMTC2 has not been previously reported to regulate auditory function, the discovery reveals a potentially new, uncharacterized mechanism of hearing loss.
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Affiliation(s)
- Christina L Runge
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee
| | - Amit Indap
- Department of Biology, Boston College, Chestnut Hill, Massachusetts
| | - Yifan Zhou
- Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee
| | - Jack W Kent
- Department of Genetics, Texas Biomedical Research Institute, San Antonio
| | - Ericka King
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee
| | - Christy B Erbe
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee
| | - Regina Cole
- Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee
| | - Jack Littrell
- Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee
| | - Kate Merath
- Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee
| | - Roland James
- Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee
| | | | - Joseph E Kerschner
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee
| | - Gabor Marth
- Department of Human Genetics, University of Utah School of Medicine, Salt Lake City
| | - Norbert Hübner
- Max Delbrück Center for Molecular Medicine, Berlin-Buch, Germany
| | - Harald H H Göring
- Department of Genetics, Texas Biomedical Research Institute, San Antonio
| | - David R Friedland
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee
| | - Wai-Meng Kwok
- Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee8Department of Anesthesiology, Medical College of Wisconsin, Milwaukee
| | - Michael Olivier
- Department of Genetics, Texas Biomedical Research Institute, San Antonio5Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee
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Shimoyama M, Smith JR, De Pons J, Tutaj M, Khampang P, Hong W, Erbe CB, Ehrlich GD, Bakaletz LO, Kerschner JE. The Chinchilla Research Resource Database: resource for an otolaryngology disease model. Database (Oxford) 2016; 2016:baw073. [PMID: 27173523 PMCID: PMC4865329 DOI: 10.1093/database/baw073] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 04/18/2016] [Indexed: 12/04/2022]
Abstract
The long-tailed chinchilla (Chinchilla lanigera) is an established animal model for diseases of the inner and middle ear, among others. In particular, chinchilla is commonly used to study diseases involving viral and bacterial pathogens and polymicrobial infections of the upper respiratory tract and the ear, such as otitis media. The value of the chinchilla as a model for human diseases prompted the sequencing of its genome in 2012 and the more recent development of the Chinchilla Research Resource Database (http://crrd.mcw.edu) to provide investigators with easy access to relevant datasets and software tools to enhance their research. The Chinchilla Research Resource Database contains a complete catalog of genes for chinchilla and, for comparative purposes, human. Chinchilla genes can be viewed in the context of their genomic scaffold positions using the JBrowse genome browser. In contrast to the corresponding records at NCBI, individual gene reports at CRRD include functional annotations for Disease, Gene Ontology (GO) Biological Process, GO Molecular Function, GO Cellular Component and Pathway assigned to chinchilla genes based on annotations from the corresponding human orthologs. Data can be retrieved via keyword and gene-specific searches. Lists of genes with similar functional attributes can be assembled by leveraging the hierarchical structure of the Disease, GO and Pathway vocabularies through the Ontology Search and Browser tool. Such lists can then be further analyzed for commonalities using the Gene Annotator (GA) Tool. All data in the Chinchilla Research Resource Database is freely accessible and downloadable via the CRRD FTP site or using the download functions available in the search and analysis tools. The Chinchilla Research Resource Database is a rich resource for researchers using, or considering the use of, chinchilla as a model for human disease. Database URL: http://crrd.mcw.edu
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Affiliation(s)
- Mary Shimoyama
- Rat Genome Database, Department of Surgery, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Jennifer R Smith
- Rat Genome Database, Department of Surgery, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Jeff De Pons
- Rat Genome Database, Department of Surgery, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Marek Tutaj
- Rat Genome Database, Department of Surgery, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Pawjai Khampang
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Children's Hospital of Wisconsin, Milwaukee, WI, USA
| | - Wenzhou Hong
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Children's Hospital of Wisconsin, Milwaukee, WI, USA
| | - Christy B Erbe
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Children's Hospital of Wisconsin, Milwaukee, WI, USA
| | - Garth D Ehrlich
- Department of Microbiology and Immunology Department of Otolaryngology-Head and Neck Surgery, Center for Genomic Sciences and Center for Advanced Microbial Processing, Institute of Molecular Medicine and Infectious Diseases, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Lauren O Bakaletz
- Center for Microbial Pathogenesis, the Research Institute at Nationwide Children's Hospital and the Ohio State University College of Medicine, Columbus, OH, USA
| | - Joseph E Kerschner
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Children's Hospital of Wisconsin, Milwaukee, WI, USA Division of Pediatric Otolaryngology, Medical College of Wisconsin, Children's Hospital of Wisconsin, Milwaukee, WI, USA
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Runge CL, Erbe CB, McNally MT, Van Dusen C, Friedland DR, Kwitek AE, Kerschner JE. A novel otoferlin splice-site mutation in siblings with auditory neuropathy spectrum disorder. Audiol Neurootol 2013; 18:374-82. [PMID: 24135434 DOI: 10.1159/000354978] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Accepted: 08/12/2013] [Indexed: 11/19/2022] Open
Abstract
We characterize a novel otoferlin mutation discovered in a sibling pair diagnosed with auditory neuropathy spectrum disorder and investigate auditory nerve function through their cochlear implants. Genetic sequencing revealed a homozygous mutation at the otoferlin splice donor site of exon 28 (IVS28 + 1G>T) in both siblings. Functional investigation showed that the intronic sequence between exons 28 and 29 was retained in the mutated minigenes that were expressed in 293T cells. Auditory nerve compound action potential recovery functions in the siblings demonstrated different rates of neural recovery, with sibling AN1 showing rapid recovery (1.14 ms) and AN2 showing average recovery (0.78 ms) compared to subjects with sensorineural hearing loss (average: adults 0.71 ms, children 0.85 ms). Differences in neural recovery were consistent with speech perception differences between the siblings. Genotype information may indicate site of lesion in hearing loss; however, additional, as yet, unknown factors may impact clinical outcomes and must be considered.
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Affiliation(s)
- Christina L Runge
- Departments of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisc., USA
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Heaford AC, Erbe CB, Bock JM. Abstract 3009: Evaluating the role of cell cycle inhibition in celecoxib toxicity through microRNA analysis. Cancer Res 2010. [DOI: 10.1158/1538-7445.am10-3009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Squamous cell carcinoma of the head and neck (SCCHN) is a major health problem worldwide, with over 45,000 new cases predicted to occur in the United States in 2009. Adjuvant therapies that can augment established treatments for SCCHN without causing significant additional morbidity are needed for this disease. Cyclooxygenase-2 (COX-2) inhibition has emerged as a potential adjuvant to established treatment regimens for SCCHN with this concept in mind, as COX-2 is known to be overexpressed in SCCHN. Celecoxib is a COX-2 specific NSAID with known antineoplastic activity against many human tumors, and is currently being used in clinical trials as a chemopreventive agent and adjuvant to established chemotherapy and radiation therapy protocols. The underlying mechanism of celecoxib toxicity remains poorly understood. Previous work from our laboratory has demonstrated marked inhibition of cell cycle progression through the G1 phase and induction of apoptosis following treatment with celecoxib in SCCHN, leading to cell cycle phase-specific toxicity to S and G2 phase cells and induction of p21waf1/cip1 with downstream inhibition of nuclear E2F activity. We therefore hypothesize that decreasing the observed cell cycle inhibition induced by celecoxib treatment may augment celecoxib toxicity by inducing cells to progress through more highly toxic cell cycle phases during celecoxib exposure. Further understanding of the mechanism of G1 arrest following celecoxib administration is therefore needed to effectively exploit this potential toxicity. MicroRNAs have been implicated in the control of cell cycle transition in several recent publications in stem cells and human cancers, and we believe that they may be involved in the cell cycle arrest seen after celecoxib treatment in SCCHN. To evaluate this hypothesis, SCCHN cells were exposed to celecoxib for 24 hours and G1 arrest was confirmed via flow cytometry. RNA and protein were extracted from celecoxib-treated and control cells and microRNA expression profiles were established by quantitative real-time PCR microarray analysis. Alterations in cell cycle gene expression across the cell cycle were assessed by similar microarray, and targets were confirmed by further western blotting and PCR analysis. Correlations between microRNA alterations in celecoxib-treated cells and cell cycle control genes were observed and extrapolated. These data provide a microRNA and cell cycle gene expression signature for celecoxib treatment in SCCHN, and further illustrate the potential role that microRNA expression plays in control of G1 cell cycle checkpoint kinetics and subsequent celecoxib toxicity.
Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 101st Annual Meeting of the American Association for Cancer Research; 2010 Apr 17-21; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2010;70(8 Suppl):Abstract nr 3009.
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Kerschner JE, Khampang P, Erbe CB, Kolker A, Cioffi JA. Mucin gene 19 (MUC19) expression and response to inflammatory cytokines in middle ear epithelium. Glycoconj J 2009; 26:1275-84. [PMID: 19533339 PMCID: PMC2918236 DOI: 10.1007/s10719-009-9245-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Revised: 05/18/2009] [Accepted: 05/20/2009] [Indexed: 11/25/2022]
Abstract
Mucin gene 19 (MUC19) has been identified as a major gel-forming mucin in the human middle ear (ME). The objectives of this investigation were to characterize the expression and assess the regulation of MUC19 in the ME cell culture models utilized in the study of otitis media (OM). Findings demonstrate that MUC19 is expressed in both human immortalized cell culture (HMEEC) and chinchilla primary epithelial culture (CMEEC). ME exposure to inflammatory cytokines TNF-alpha, IL-1beta, IL-6 and IL-8 up-regulate MUC19 transcription, most robustly after exposure to TNF-alpha. Kinetic experiments suggest a relative early response in MUC19 transcription and a down-regulation after prolonged exposure. Glycoprotein production was increased in response to the increased transcription as well. Similar to other mucin genes in the ME, MUC19 is differentially regulated after exposure to inflammatory cytokines. The large size, gel-forming properties and up-regulation in response to important inflammatory cytokines of MUC19 suggest that it has significant potential to play a role in both physiology and pathophysiology of the ME.
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Affiliation(s)
- Joseph E Kerschner
- Division of Pediatric Otolaryngology, Medical College of Wisconsin, Children's Hospital of Wisconsin, 9000 W. Wisconsin Avenue, Milwaukee, WI, 53226, USA.
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Roche JP, Wackym PA, Cioffi JA, Kwitek AE, Erbe CB, Popper P. In silico analysis of 2085 clones from a normalized rat vestibular periphery 3' cDNA library. Audiol Neurootol 2005; 10:310-22. [PMID: 16103642 PMCID: PMC1421512 DOI: 10.1159/000087348] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2005] [Accepted: 03/21/2005] [Indexed: 11/19/2022] Open
Abstract
The inserts from 2400 cDNA clones isolated from a normalized Rattus norvegicus vestibular periphery cDNA library were sequenced and characterized. The Wackym-Soares vestibular 3' cDNA library was constructed from the saccular and utricular maculae, the ampullae of all three semicircular canals and Scarpa's ganglia containing the somata of the primary afferent neurons, microdissected from 104 male and female rats. The inserts from 2400 randomly selected clones were sequenced from the 5' end. Each sequence was analyzed using the BLAST algorithm compared to the Genbank nonredundant, rat genome, mouse genome and human genome databases to search for high homology alignments. Of the initial 2400 clones, 315 (13%) were found to be of poor quality and did not yield useful information, and therefore were eliminated from the analysis. Of the remaining 2085 sequences, 918 (44%) were found to represent 758 unique genes having useful annotations that were identified in databases within the public domain or in the published literature; these sequences were designated as known characterized sequences. 1141 sequences (55%) aligned with 1011 unique sequences had no useful annotations and were designated as known but uncharacterized sequences. Of the remaining 26 sequences (1%), 24 aligned with rat genomic sequences, but none matched previously described rat expressed sequence tags or mRNAs. No significant alignment to the rat or human genomic sequences could be found for the remaining 2 sequences. Of the 2085 sequences analyzed, 86% were singletons. The known, characterized sequences were analyzed with the FatiGO online data-mining tool (http://fatigo.bioinfo.cnio.es/) to identify level 5 biological process gene ontology (GO) terms for each alignment and to group alignments with similar or identical GO terms. Numerous genes were identified that have not been previously shown to be expressed in the vestibular system. Further characterization of the novel cDNA sequences may lead to the identification of genes with vestibular-specific functions. Continued analysis of the rat vestibular periphery transcriptome should provide new insights into vestibular function and generate new hypotheses. Physiological studies are necessary to further elucidate the roles of the identified genes and novel sequences in vestibular function.
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Affiliation(s)
- Joseph P. Roche
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisc., USA
| | - P. Ashley Wackym
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisc., USA
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisc., USA
| | - Joseph A. Cioffi
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisc., USA
| | - Anne E. Kwitek
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisc., USA
| | - Christy B. Erbe
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisc., USA
| | - Paul Popper
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisc., USA
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Cioffi JA, Wackym PA, Erbe CB, Gaggl W, Popper P. Molecular characterization of two novel splice variants of G alphai2 in the rat vestibular periphery. ACTA ACUST UNITED AC 2005; 137:89-97. [PMID: 15950765 DOI: 10.1016/j.molbrainres.2005.02.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2004] [Revised: 01/27/2005] [Accepted: 02/13/2005] [Indexed: 11/28/2022]
Abstract
GTP binding proteins play an important role in mediating signals transduced across the cell membrane by membrane-bound receptors. We previously described a partial sequence, termed Galphai2vest, obtained from rat vestibular tissue that was nearly identical to rat Galphai2. Using an experimental strategy to further characterize Galphai2vest (GenBank accession number AF189020) and identify other possible Galphai2-related transcripts expressed in the rat vestibular periphery, we employed a RecA-based gene enrichment protocol in place of conventional library screening techniques. We identified two novel Galphai2 splice variants, Galphai2(a) (GenBank accession number AY899210) and Galphai2(b) (GenBank accession number AY899211), that have most of exons 8 and 9 deleted, and exons 5 through 9 deleted, respectively. In situ hybridization studies were completed to determine the differential expression of Galphai2 between the vestibular primary afferent neurons and the vestibular end organs. Computer modeling and predicted 3D conformation of the wild type Galphai2 and the two splice variants were completed to evaluate the changes associated with the Gbetagamma and GTP binding sites. These two novel alternatively spliced isoforms of Galphai2 putatively encode truncated proteins that could serve unique roles in the physiology of the vestibular neuroepithelium. Galphai2vest was found to be a processed pseudogene.
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MESH Headings
- Alternative Splicing/genetics
- Animals
- Binding Sites/physiology
- Exons/genetics
- Female
- GTP-Binding Protein alpha Subunit, Gi2
- GTP-Binding Protein alpha Subunits, Gi-Go/genetics
- GTP-Binding Protein alpha Subunits, Gi-Go/isolation & purification
- GTP-Binding Protein alpha Subunits, Gi-Go/metabolism
- Hair Cells, Vestibular/metabolism
- Male
- Models, Molecular
- Molecular Sequence Data
- Neurons, Afferent/metabolism
- Protein Isoforms/genetics
- Protein Isoforms/isolation & purification
- Protein Isoforms/metabolism
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/isolation & purification
- Proto-Oncogene Proteins/metabolism
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats
- Sequence Homology, Amino Acid
- Sequence Homology, Nucleic Acid
- Vestibular Nerve/metabolism
- Vestibule, Labyrinth/metabolism
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Affiliation(s)
- Joseph A Cioffi
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226-3596, USA
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Cristobal R, Wackym PA, Cioffi JA, Erbe CB, Roche JP, Popper P. Assessment of differential gene expression in vestibular epithelial cell types using microarray analysis. ACTA ACUST UNITED AC 2005; 133:19-36. [PMID: 15661362 DOI: 10.1016/j.molbrainres.2004.10.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2004] [Indexed: 10/26/2022]
Abstract
Current global gene expression techniques allow the evaluation and comparison of the expression of thousands of genes in a single experiment, providing a tremendous amount of information. However, the data generated by these techniques are context-dependent, and minor differences in the individual biological samples, methodologies for RNA acquisition, amplification, hybridization protocol and gene chip preparation, as well as hardware and analysis software, lead to poor correlation between the results. One of the significant difficulties presently faced is the standardization of the protocols for the meaningful comparison of results. In the inner ear, the acquisition of RNA from individual cell populations remains a challenge due to the high density of the different cell types and the paucity of tissue. Consequently, laser capture microdissection was used to selectively collect individual cells and regions of cells from cristae ampullares followed by extraction of total RNA and amplification to amounts sufficient for high throughput analysis. To demonstrate hair cell-specific gene expression, myosin VIIA, calmodulin and alpha9 nicotinic acetylcholine receptor subunit mRNAs were amplified using reverse transcription-polymerase chain reaction (RT-PCR). To demonstrate supporting cell-specific gene expression, cyclin-dependent kinase inhibitor p27kip1 mRNA was amplified using RT-PCR. Subsequent experiments with alpha9 RT-PCR demonstrated phenotypic differences between type I and type II hair cells, with expression only in type II hair cells. Using the laser capture microdissection technique, microarray expression profiling demonstrated 408 genes with more than a five-fold difference in expression between the hair cells and supporting cells, of these 175 were well annotated. There were 97 annotated genes with greater than a five-fold expression difference in the hair cells relative to the supporting cells, and 78 annotated genes with greater than a five-fold expression difference in the supporting cells relative to the hair cells.
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Affiliation(s)
- Ricardo Cristobal
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, 9200 W Wisconsin Avenue, Milwaukee, WI 53226-3596, USA
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Wackym PA, Cioffi JA, Erbe CB, Popper P. G-protein Golfalpha (GNAL) is expressed in the vestibular end organs and primary afferent neurons of Rattus norvegicus. J Vestib Res 2005. [DOI: 10.3233/ves-2005-15102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Guanine nucleotide binding proteins (G-proteins) play an important role in mediating signals transduced across the cell membrane by membrane-bound receptors. The precise role of these proteins and their coupled receptors in the physiology of the vestibular neuroepithelium is poorly understood. Although Golfalpha was originally discovered in the olfactory neuroepithelium and striatum, we recently identified this G-protein alpha subunit in a normalized cDNA library constructed from rat vestibular end organs and vestibular nerves including Scarpa's ganglia. In order to further characterize Golfalpha in the rat vestibular periphery, we used in situ hybridization and reverse transcription polymerase chain reaction to determine the anatomic context of this gene expression. Golfalpha was found in both the end organs and the ganglia and could serve unique roles in the physiology of the vestibular neuroepithelium.
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Affiliation(s)
- P. Ashley Wackym
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, WI 53226, USA
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Joseph A. Cioffi
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Christy B. Erbe
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Paul Popper
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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Cristobal R, Wackym PA, Cioffi JA, Erbe CB, Popper P. Selective acquisition of individual cell types in the vestibular periphery for molecular biology studies. Otolaryngol Head Neck Surg 2005; 131:590-5. [PMID: 15523431 DOI: 10.1016/j.otohns.2004.06.700] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES To develop a method for characterizing the transcriptome of individual cell types in the inner ear sensory epithelia. STUDY DESIGN We employed the technique of laser capture microdissection to obtain enriched populations of hair cells and supporting cells. The respective mRNAs were extracted, reverse transcribed, and amplified using PCR. RESULTS We were able to isolate RNAs with good integrity from enriched cell populations obtained with laser capture microscopy and amplify specific mRNA targets. CONCLUSIONS We can now investigate the molecular differences between the different cell types in the inner ear sensory epithelia as identified by morphological criteria. SIGNIFICANCE Analysis of gene expression profiles in the inner ear cell types has been hampered by the small size of this tissue and by the compact histoarchitecture of the sensory epithelia; however, the present technique offers new possibilities for the analysis of transcriptomes in the vestibular periphery using available high-throughput gene expression analysis methods.
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Affiliation(s)
- Ricardo Cristobal
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, WI 53226-3596, USA
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Wackym PA, Cioffi JA, Erbe CB, Popper P. G-protein Golfalpha (GNAL) is expressed in the vestibular end organs and primary afferent neurons of Rattus norvegicus. J Vestib Res 2005; 15:11-5. [PMID: 15908736 PMCID: PMC1317111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Guanine nucleotide binding proteins (G-proteins) play an important role in mediating signals transduced across the cell membrane by membrane-bound receptors. The precise role of these proteins and their coupled receptors in the physiology of the vestibular neuroepithelium is poorly understood. Although Golfalpha was originally discovered in the olfactory neuroepithelium and striatum, we recently identified this G-protein alpha subunit in a normalized cDNA library constructed from rat vestibular end organs and vestibular nerves including Scarpa's ganglia. In order to further characterize Golfalpha in the rat vestibular periphery, we used in situ hybridization and reverse transcription polymerase chain reaction to determine the anatomic context of this gene expression. Golfalpha was found in both the end organs and the ganglia and could serve unique roles in the physiology of the vestibular neuroepithelium.
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Affiliation(s)
- P Ashley Wackym
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
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Abstract
OBJECTIVES/HYPOTHESIS Mutations in the connexin 26 (Cx26) or gap junction beta 2 gene are the leading cause of hereditary nonsyndromic sensorineural hearing loss in Caucasians. The Cx26 coding region of 68 children with nonsyndromic sensorineural hearing loss was sequenced to determine the frequency and type of Cx26 mutations in this population. Screening was also performed for a common connexin 30 (Cx30) or gap junction beta 6 mutation (del [GJB6-D13S1830]). Children also underwent audiological testing to determine whether any correlation exists between Cx26 mutations and severity of hearing loss. STUDY DESIGN In all, 68 children with nonsyndromic sensorineural hearing loss were screened for Cx26 and Cx30 mutations by polymerase chain reaction and direct sequencing. METHODS Genomic DNA was amplified by polymerase chain reaction using primers that flank the entire Cx26 coding region. Screening for the 342-kb Cx30 deletion was performed using primers that amplified the breakpoint junction of the deletion. The amplicons were then sequenced in both directions and analyzed for mutations. Audiometric testing, including pure-tone audiometry and auditory evoked brainstem response, was also performed to determine the degree of hearing loss. RESULTS Twenty-seven of 68 children tested had mutations in Cx26 with 35delG being the most prevalent. Ten additional Cx26 mutations were detected including a novel compound heterozygote. Two children were heterozygous for the Cx30 del (GJB6-D13S1830) mutation. CONCLUSION Cx26 and Cx30 mutations were present in 41.2% of children tested in the study population. Audiometric data supported previous studies demonstrating a greater degree of hearing loss in subjects who are homozygous for the 35delG mutation.
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Affiliation(s)
- Christy B Erbe
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin, U.S.A
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Cioffi JA, Erbe CB, Raphael R, Kwitek AE, Tiwari UK, Jacob HJ, Popper P, Wackym PA. Expression of G-protein alpha subunit genes in the vestibular periphery of Rattus norvegicus and their chromosomal mapping. Acta Otolaryngol 2003; 123:1027-34. [PMID: 14710903 DOI: 10.1080/00016480310000773] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
OBJECTIVE Heterotrimeric G-proteins play an important role in mediating signals transduced across the cell membrane by membrane-bound receptors. The precise role of G-proteins and their coupled receptors in the physiology of the vestibular neuroepithelium is not well understood. The purpose of this study was to better define the role of these proteins by examining their expression in the rat vestibular periphery and characterizing their chromosomal location. MATERIAL AND METHODS To characterize G-protein alpha subunit gene expression in the target tissue of interest, we performed polymerase chain reaction (PCR) using degenerate G-protein primers corresponding to conserved regions in the G-protein alpha subunit coding sequence on a normalized rat vestibular cDNA library. PCR amplicons were cloned and 50 clones were randomly selected and sequenced. Radiation hybrid (RH) mapping was used to determine the chromosomal location of G alpha(olf) and two previously identified G-protein alpha subunits--G alpha(i2) and G alpha(i2(vest))--in the rat genome. RESULTS The following G-protein alpha subunits were identified in the normalized cDNA library: G alpha(olf), G alpha(s), G alpha(o) and G alpha(s2). G alpha(olf) maps to chromosome 18 between markers D18Mit17b and D18Mgh2. G alpha(i2) maps to chromosome 8 between markers D8Rat65 and D8Mgh2. G alpha(i2(vest)) maps to chromosome 1 between markers D1Rat132 and D1Rat202. These chromosomal locations in the rat genome are syntenic to chromosomal regions in which the homologous G-protein alpha subunit genes have been localized in the human and mouse genomes, further validating RH mapping as an effective and accurate tool. We were unable to RH map the location of G alpha(o) due to its extensive homology with the hamster gene. CONCLUSION The characterization of G-protein alpha subunit gene expression in the vestibular periphery and the chromosomal localization of these genes in the rat revealed that a diverse group of these second messengers are expressed.
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Affiliation(s)
- Joseph A Cioffi
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA
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Halum SL, Erbe CB, Friedland DR, Wackym PA. Gene discovery using a human vestibular schwannoma cDNA library constructed from a patient with neurofibromatosis type 2 (NF2). Otolaryngol Head Neck Surg 2003; 128:364-71. [PMID: 12646839 DOI: 10.1067/mhn.2003.99] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Despite a strong association of schwannomin/merlin gene mutations with vestibular schwannoma formation, the regulatory mechanisms and biologic pathways involved are still largely unknown. The hypothesis of this study is that the genesis and growth characteristics of neurofibromatosis type 2 (NF2)-associated vestibular schwannomas are determined by genetic alterations that vary in gene transcript expression; this transcript expression includes oncogenic gene products that may be identified by construction and sequencing of a cDNA library from NF2-associated vestibular schwannoma. METHODS Approximately 3 mL of fresh tumor was obtained during resection of a 4-cm vestibular schwannoma from a patient with NF2. Poly(A)(+) mRNA was isolated, synthesized into double-stranded cDNA, and unidirectionally inserted into Uni-Zap XR (Stratagene, La Jolla, CA) bacteriophage vectors. Bacteriophage vectors containing cDNA inserts were processed into phagemids according to Uni-Zap XR protocol, and inserted vectors were sequenced and analyzed using BLAST software (National Institutes of Health, Bethesda, MD) with GenBank, EMBL, DDBJ, and PBD databases. RESULTS The cDNA library contained 2.4 million primary plaques. Inserts averaged 1.8 kilobases (kb) in length, with a range of 0.8 to 3.0 kb. BLAST multidatabase comparison of the sequence data obtained from 50 randomly selected clones yielded identification of 13 sequences representing known human genes and 17 sequences representing cloned sequences with unknown function. Three clones represented sequences not previously described in vestibular schwannomas but strongly implicated in oncogenesis within other tissues. CONCLUSIONS These data have implications for understanding the molecular mechanisms of vestibular schwannoma tumor biology. Identified genes may provide future diagnostic/prognostic markers and therapeutic targets.
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Affiliation(s)
- Stacey L Halum
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee 53226, USA
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Abstract
Acetylcholine is the main neurotransmitter of the vestibular efferent system and a wide variety of muscarinic and nicotinic acetylcholine receptors are expressed in the vestibular periphery. The role of these receptors and in particular the role of muscarinic acetylcholine receptors in the physiology of the vestibular neuroepithelium is not understood. Congenic and consomic rats are a convenient way to investigate the involvement of candidate genes in the manifestation of defined traits. To use congenic or consomic rats to elucidate the roles of these receptors in vestibular physiology or pathology the chromosomal location of the genes encoding these receptors has to be determined. Using radiation hybrid (RH) mapping and a rat RH map server (www.rgd.mcw.edu/RHMAP SERVER/), we determined the chromosomal locations of the muscarinic acetylcholine receptor genes in the rat (Rattus norvegicus). The m1-m5 muscarinic subtypes mapped to the following chromosomes: Chrm1, chromosome 1; Chrm2, chromosome 4; Chrm3, chromosome 17; Chrm4, chromosome 3; and Chrm5, chromosome 3. With the chromosomal location for each of these muscarinic subtypes known, it is now possible to develop congenic and consomic strains of rats that can be used to study the functions of each of these subtypes.
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Affiliation(s)
- Jeffrey Tseng
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, 9200 W. Wisconsin Ave., Milwaukee, WI 53226, USA
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Abstract
OBJECTIVE Mutations of the gap junction beta 2 (GJB2) gene coding for the protein connexin 26 account for up to 50% of nonsyndromic sensorineural hearing loss (NSHL), with specific mutations associated with distinct ethnic groups. A biracial family with nonsyndromic sensorineural deafness consistent with autosomal recessive inheritance was examined for connexin 26 (Cx26) mutations. STUDY DESIGN Prospective observational study. METHODS A family consisting of a Caucasian mother and a Chinese father with two of six children affected by NSHL was examined for Cx26 mutations. Peripheral blood lymphocyte DNA was used to amplify by polymerase chain reaction the Cx26 coding region, followed by mutation detection enhancement gel screening and complete sequencing. Phenotypic characterization using audiometric testing was completed for all children and both parents. RESULTS The two affected children were found to be compound heterozygotes for Cx26 mutations, displaying a previously unreported combination of 35delG and 235delC. The parents were each unaffected heterozygotes consistent with their ethnic heritage, specifically, the Caucasian mother a 35delG heterozygote and the Chinese father a 235delC heterozygote. CONCLUSIONS Connexin 26 mutations account for a significant proportion of NSHL worldwide, with specific mutations linked to distinct ethnic groups. Genetic analysis of a biracial family with NSHL revealed a novel 35delG/235delC compound heterozygous state in phenotypically affected children. These results highlight the usefulness of Cx26 mutation screening for genetic counseling and suggest that the 235delC mutation is present in China as it is in Japan and Korea.
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Affiliation(s)
- Kevin C Harris
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, U.S.A
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Tseng J, Kwitek-Black AE, Erbe CB, Popper P, Jacob HJ, Wackym PA. Radiation hybrid mapping of 11 alpha and beta nicotinic acetylcholine receptor genes in Rattus norvegicus. Brain Res Mol Brain Res 2001; 91:169-73. [PMID: 11457506 DOI: 10.1016/s0169-328x(01)00146-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Acetylcholine is the main neurotransmitter of the vestibular efferents and a wide variety of muscarinic and nicotinic acetylcholine receptors are expressed in the vestibular periphery. To date, 11 nicotinic subunits (alpha and beta) have been reported in mammals. Previously, our group [Brain Res. 778 (1997) 409] reported that these nicotinic acetylcholine receptor alpha and beta subunits were differentially expressed in the vestibular periphery of the rat. To begin an understanding of the molecular genetics of these vestibular efferents, this study examined the chromosomal locations of these nicotinic acetylcholine receptor genes in the rat (Rattus norvegicus). Using radiation hybrid mapping and a rat radiation hybrid map server (www.rgd.mcw.edu/RHMAP SERVER/), we determined the chromosomal position for each of these genes. The alpha2-7, alpha9, alpha10, and beta2-4 nicotinic subunits mapped to the following chromosomes: alpha2, chr. 15; alpha3, chr. 8; alpha4, chr. 3; alpha5, chr. 8; alpha6, chr. 16; alpha7, chr. 1; alpha9, chr. 14; alpha10, chr. 7; beta2, chr. 2; beta3, chr. 16; and beta4, chr. 8. With the location for each of these nicotinic subunits known, it is now possible to develop consomic and/or congenic strains of rats that can be used to study the functional genomics of each of these subunits.
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Affiliation(s)
- J Tseng
- Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, 9200 W. Wisconsin Ave., Milwaukee, WI 53226, USA
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