This proposal requests support to clone and characterize genes involved in hearing at the molecular level. The applicant has succeeded in producing a human fetal cochlear expression library which has yielded greater than 500 unique EST's. The work proposed in the present grant will focus largely on two genes Coch-5B2 and Coch-1D3 which were isolated from this library. The complete cDNA sequence and genomic structure of Coch-5B2 will be determined to facilitate mutation screening of the gene as a candidate for DFN1A9. Northern analysis and in situ hybridization studies, as well as immunohistochemical studies using a polyclonal antibody to the Coch-5B2 protein, will be used to define the tissue distribution of gene expression during fetal and adult life as well as the cellular and subcellular localization of the gene product. An existing mouse mutant, Asp-1, in the homologous genomic region will be screened as a positional candidate and sequence homology searches will be pursued to attempt to define the function of the gene. A homolog, antiquitin (ATQ1), for Coch-1D3 has already been discovered in the pea plant which is apparently involved in the proper maintenance of turgor. Northern analysis shows that the gene is extensively expressed in fetal cochlea, kidney, ovary, eye and heart. The gene maps to chromosome 5, and could therefore be a candidate for deafness genes that map to that chromosome. The proposed studies include Western blot analysis in adult as well as fetal tissues, and in-situ and immunohistochemical studies to investigate the site specific expression of the gene. The other major goal of the study will be to chromosomally localize the 5 percent of the greater than 500 cochlear specific EST's whose placement is not immediately apparent from sequence searches. These and other cochlear specific ESTs will then be pursued as positional candidates for mapped forms of syndromic and non-syndromic deafness.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Research Project (R01)
Project #
3R01DC003402-04S1
Application #
6345357
Study Section
Special Emphasis Panel (ZRG2 (03))
Program Officer
Johnson, Thomas E
Project Start
2000-09-01
Project End
2001-06-30
Budget Start
2000-09-01
Budget End
2001-06-30
Support Year
4
Fiscal Year
2000
Total Cost
$49,986
Indirect Cost
Name
Brigham and Women's Hospital
Department
Type
DUNS #
071723621
City
Boston
State
MA
Country
United States
Zip Code
02115
Currall, Benjamin B; Chen, Ming; Sallari, Richard C et al. (2018) Loss of LDAH associated with prostate cancer and hearing loss. Hum Mol Genet 27:4194-4203
Diaz-Horta, Oscar; Abad, Clemer; Sennaroglu, Levent et al. (2016) ROR1 is essential for proper innervation of auditory hair cells and hearing in humans and mice. Proc Natl Acad Sci U S A 113:5993-8
Burgess, Barbara J; O'Malley, Jennifer T; Kamakura, Takefumi et al. (2016) Histopathology of the Human Inner Ear in the p.L114P COCH Mutation (DFNA9). Audiol Neurootol 21:88-97
Bae, Seung-Hyun; Robertson, Nahid G; Cho, Hyun-Ju et al. (2014) Identification of pathogenic mechanisms of COCH mutations, abolished cochlin secretion, and intracellular aggregate formation: genotype-phenotype correlations in DFNA9 deafness and vestibular disorder. Hum Mutat 35:1506-1513
Robertson, Nahid G; O'Malley, Jennifer T; Ong, Cheng Ai et al. (2014) Cochlin in normal middle ear and abnormal middle ear deposits in DFNA9 and Coch (G88E/G88E) mice. J Assoc Res Otolaryngol 15:961-74
Currall, Benjamin B; Chiang, C; Talkowski, Michael E et al. (2013) Mechanisms for Structural Variation in the Human Genome. Curr Genet Med Rep 1:81-90
Cho, Hyun-Ju; Park, Hong-Joon; Trexler, Maria et al. (2012) A novel COCH mutation associated with autosomal dominant nonsyndromic hearing loss disrupts the structural stability of the vWFA2 domain. J Mol Med (Berl) 90:1321-1331
Jones, Sherri M; Robertson, Nahid G; Given, Shelly et al. (2011) Hearing and vestibular deficits in the Coch(-/-) null mouse model: comparison to the Coch(G88E/G88E) mouse and to DFNA9 hearing and balance disorder. Hear Res 272:42-8
Brown, Kerry K; Reiss, Jacob A; Crow, Kate et al. (2010) Deletion of an enhancer near DLX5 and DLX6 in a family with hearing loss, craniofacial defects, and an inv(7)(q21.3q35). Hum Genet 127:19-31
Brown, Kerry K; Alkuraya, Fowzan S; Matos, Michael et al. (2009) NR2F1 deletion in a patient with a de novo paracentric inversion, inv(5)(q15q33.2), and syndromic deafness. Am J Med Genet A 149A:931-8

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