BRIEF DESCRIPTION
CA4 retinitis pigmentosa is a type of retinitis pigmentosa (RP) caused by a mutation in the carbonic anhydrase IV (CA4) gene. RP is a group of inherited eye diseases that cause the retina's light-sensing cells to gradually deteriorate, leading to vision loss.
A mutation in the CA4 gene can cause RP. The CA4 gene encodes a protein that's expressed in the choriocapillaris of the eye. One mutation identified in a patient with RP is R69H, which impairs the pH recovery of the retina.
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ACADEMIC PAPERS | JOURNAL ARTICLES | PERSONAL STORIES
Genotyping and CA4 gene analysis in a Chinese family with retinitis pigmentosa
Zhang, Xiao-hui, Bing Dong, Wei-yu Yan, Ming-hua Shan | PubMed | Vol. 24 (6) | 670-3 | Jan 2008 | pubmed.ncbi.nlm.nih.gov/18067080/
To illuminate pathogenic gene and mutation in a Chinese family with autosomal dominant retinitis pigmentosa (adRP). Genetic linkage analysis was performed on the known genetic loci for adRP with a panel of polymorphic markers, and then all exons including exon-intron boundary, 5oUTR and 3oUTR of the candidate gene were sequenced directly. Two-point LOD scores were negative with all markers tested except D17S701 (Zmax=2.107, theta=0) and D17S1604 (Zmax=1.806, theta=0).
Identification and characterization of a novel mutation in the carbonic anhydrase IV gene that causes retinitis pigmentosa
Bernardo V Alvarez, Eranga N Vithana, Zhenglin Yang, Adrian H Koh, Kit Yeung, Victor Yong, Haley J Shandro, Yali Chen, Prasanna Kolatkar, Paaventhan Palasingam, Kang Zhang, Tin Aung, Joseph R Casey | Investigative Ophthalmology & Visual Science | Aug 2007 | Vol.48 | 3459-3468 |doi.org/10.1167/iovs.06-1515
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, . . .
Cell-specific differences in the processing of the R14W CA4 mutant associated with retinitis pigmentosa 17 (RP17)
Aisha Pandor, Rajkumar Ramesar, Sharon Prince | J Cell Biochem | 2010 Oct 15 | Vol. 111, Issue 3 | 735-41 | doi: 10.1002/jcb.22759
Retinitis pigmentosa is a highly heterogeneous form of inherited blindness which affects more than 1.3 million individuals worldwide. The RP17 form of the disease is caused by an arginine to tryptophan (R14W) mutation in the signal sequence of carbonic anhydrase IV (CAIV). While CAIV is expressed in the choriocapillaries of the eye and renal epithelium, the R14W mutation results in an exclusively ocular phenotype in affected individuals.