|
|||||
|
|
Molecular Karyotyping of a Dysmorphic Girl from Saudi Arabia with CYP1B1-negative Primary Congenital Glaucoma |
|
| Authors: | Khaled K. Abu-Amero Altaf A. Kondkar |
| Affiliation: | 1. Ophthalmic Genetics Laboratory, Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia,;2. Department of Ophthalmology, College of Medicine, University of Florida, Jacksonville, FL, USA, and;3. Ophthalmic Genetics Laboratory, Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia, |
| Abstract: | Purpose: To report the results of molecular karyotyping for a dysmorphic girl with CYP1B1-negative primary congenital glaucoma from Saudi Arabia, where CYPB1 mutations account for over 90% of cases of primary congenital glaucoma and the remaining cases are idiopathic. Methods: CYP1B1 sequencing in the affected child; high-resolution array comparative genomic hybridization (array CGH) of the affected child and both unaffected parents (Affymetrix Cytogenetics Whole-Genome 2.7M array; Affymetrix Inc., Santa Clara, CA, USA). Results: The girl did not harbor CYP1B1 mutation by Sanger sequencing. Array CGH revealed 2 de novo 7p heterozygous duplications (7p21 – 7p14, encompassing 223 genes, and 7p14-7p11.2, encompassing 225 genes) and a 4p homozygous microdeletion (4p14) encompassing one gene only, DTHD1. Conclusions: The fact that this dysmorphic girl is Saudi Arabian and has CYP1B1-negative primary congenital glaucoma suggests that her glaucoma phenotype is related to her de novo copy number variation. Loss or gain of one or more of the genes encompassed in the identified chromosomal areas may be associated with primary congenital glaucoma and/or other observed phenotypic features. |
| Keywords: | Array comparative genomic hybridization CYP1B1 primary congenital glaucoma |