Homozygous mutations in PXDN cause congenital cataract, corneal opacity, and developmental glaucoma.

Abstract

Anterior segment dysgenesis describes a group of heterogeneous developmental disorders that affect the anterior chamber of the eye and are associated with an increased risk of glaucoma. Here, we report homozygous mutations in peroxidasin (PXDN) in two consanguineous Pakistani families with congenital cataract-microcornea with mild to moderate corneal opacity and in a consanguineous Cambodian family with developmental glaucoma and severe corneal opacification. These results highlight the diverse ocular phenotypes caused by PXDN mutations, which are likely due to differences in genetic background and environmental factors. Peroxidasin is an extracellular matrix-associated protein with peroxidase catalytic activity, and we confirmed localization of the protein to the cornea and lens epithelial layers. Our findings imply that peroxidasin is essential for normal development of the anterior chamber of the eye, where it may have a structural role in supporting cornea and lens architecture as well as an enzymatic role as an antioxidant enzyme in protecting the lens, trabecular meshwork, and cornea against oxidative damage.

• Authors: Kamron Khan, Adam Rudkin, David A Parry, Kathryn P Burdon, Martin McKibbin, Clare V Logan, Zakia I A Abdelhamed, James S Muecke, Narcis Fernandez-Fuentes, Kate J Laurie, Mike Shires, Rhys Fogarty, Ian M Carr, James A Poulter, Joanne E Morgan, Moin D Mohamed, Hussain Jafri, Yasmin Raashid, Ngy Meng, Horm Piseth, Carmel Toomes, Robert J Casson, Graham R Taylor, Michael Hammerton, Eamonn Sheridan, Colin A Johnson, Chris F Inglehearn, Jamie E Craig, Manir Ali
• Journal: American journal of human genetics (Am J Hum Genet) Vol. 89 Issue 3 Pg. 464-73 (Sep 09 2011) ISSN: 1537-6605 [Electronic] United States
• PMID: 21907015 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2011 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

Chemical References

• Extracellular Matrix Proteins
• peroxidasin
• Peroxidase

Topics

• Animals
• Base Sequence
• Cataract (genetics, pathology)
• Cornea (metabolism, pathology)
• Corneal Opacity (genetics, pathology)
• Extracellular Matrix Proteins (chemistry, genetics, metabolism)
• Genetic Predisposition to Disease (genetics)
• Glaucoma (genetics, pathology)
• Humans
• Mice
• Microscopy, Fluorescence
• Models, Molecular
• Molecular Sequence Data
• Mutation (genetics)
• Pedigree
• Peroxidase (chemistry, genetics, metabolism)
• Sequence Analysis, DNA