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1From the Menzies Research Institute, University of Tasmania, Hobart, Australia; the 2Department of Genetics, Southwest Foundation for Biomedical Research, San Antonio, Texas; the 3Genetics and Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia; the 4Center for Eye Research Australia, Royal Victorian Eye and Ear Hospital, University of Melbourne, Melbourne, Australia; the 5Department of Ophthalmology, Flinders University, Adelaide, Australia; and the 6Center for Human Genomics and the 7Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina.
PURPOSE. The purpose of this study was to identify genetic contributions to primary open-angle glaucoma (POAG) through investigations of two quantitative components of the POAG phenotype.
METHODS. Genome-wide multipoint variancecomponents linkage analyses of maximum recorded intraocular pressure (IOP) and maximum vertical cup-to-disc ratio were conducted on data from a single, large Australian POAG pedigree that has been found to segregate the myocilin Q368X mutation in some individuals.
RESULTS. Multipoint linkage analysis of maximum recorded IOP produced a peak LOD score of 3.3 (P = 0.00015) near marker D10S537 on 10q22, whereas the maximum cup-to-disc ratio produced a peak LOD score of 2.3 (P = 0.00056) near markers D1S197 to D1S220 on 1p32. Inclusion of the myocilin Q368X mutation as a covariate provided evidence of an interaction between this mutation and the IOP and cup-to-disc ratio loci.
CONCLUSIONS. Significant linkage has been identified for maximum IOP and suggestive linkage for vertical cup-to-disc ratio. Identification of genes contributing to the variance of these traits will enhance understanding of the pathophysiology of POAG as a whole.
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