Please use this identifier to cite or link to this item: https://doi.org/10.1167/iovs.06-1515
Title: Identification and characterization of a novel mutation in the carbonic anhydrase IV gene that causes retinitis pigmentosa
Authors: Alvarez, B.V.
Vithana, E.N. 
Yang, Z.
Koh, A.H.
Yeung, K.
Yong, V.
Shandro, H.J.
Chen, Y.
Kolatkar, P. 
Palasingam, P.
Zhang, K.
Aung, T. 
Casey, J.R.
Issue Date: Aug-2007
Citation: Alvarez, B.V., Vithana, E.N., Yang, Z., Koh, A.H., Yeung, K., Yong, V., Shandro, H.J., Chen, Y., Kolatkar, P., Palasingam, P., Zhang, K., Aung, T., Casey, J.R. (2007-08). Identification and characterization of a novel mutation in the carbonic anhydrase IV gene that causes retinitis pigmentosa. Investigative Ophthalmology and Visual Science 48 (8) : 3459-3468. ScholarBank@NUS Repository. https://doi.org/10.1167/iovs.06-1515
Abstract: PURPOSE. The autosomal dominant retinitis pigmentosa (adRP) gene on chromosome 17, region q22 (RP17), was recently identified as a glycosylphosphatidylinositol membrane-anchored zinc metalloenzyme (protein CAIV), highly expressed in the choriocapillaris of the eye and undetectable in the retina. Only two missense mutations have thus far been identified in the gene CA4. Functional analysis of these mutations demonstrated that retinal disease may result from perturbation of pH homeostasis in the outer retina, after disruption of CAIV and sodium bicarbonate cotransporter 1 (NBC1)-mediated bicarbonate transport. CA4 was screened in a panel of patients with RP, to expand the mutation spectrum of this novel adRP gene and understand its pathogenic mechanism. METHODS. A total of 96 patients with simplex RP and adRP of Chinese ethnicity were screened for mutations in the eight coding exons of the CA4 gene by bidirectional sequencing. Functional consequences of CA4 mutations on the NBC1-mediated bicarbonate transport were studied by measuring bicarbonate fluxes in HEK293 cells cotransfected with NBC1 and CA4 mutant cDNAs. RESULTS. Thirteen sequence alterations were identified, including a novel mutation within exon 3 of CA4 (R69H) in a patient with simplex RP. R69H was not found in 432 normal chromosomes. R69H CAIV impaired NBC1-mediated pH recovery after acid load. CONCLUSIONS. A novel mutation has been identified in CA4 that provides further evidence that impaired pH regulation may underlie photoreceptor degeneration in RP17. This study indicates that, as with European patients with RP, mutations in CA4 also account for ≤1% of Chinese patients with RP. Copyright © Association for Research in Vision and Ophthalmology.
Source Title: Investigative Ophthalmology and Visual Science
URI: http://scholarbank.nus.edu.sg/handle/10635/131599
ISSN: 01460404
DOI: 10.1167/iovs.06-1515
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

24
checked on Jun 15, 2018

WEB OF SCIENCETM
Citations

21
checked on May 28, 2018

Page view(s)

33
checked on May 31, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.