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The problem of overlapping glaucoma families in the Glaucoma Inheritance Study in Tasmania (GIST)
journal contribution
posted on 2023-05-16, 10:54 authored by Sack, J, Healey, DL, Degraaf, AP, Wilkinson, RM, Wilkinson, CH, Barbour, JM, Coote, MA, McCartney, PJ, Rait, JL, Cooper, RL, Ring, MA, Mackey, DAThe Glaucoma Inheritance Study in Tasmania (GIST) is a population survey of Australia's island state, Tasmania (population 450,000). Its aim is to find families with autosomal dominant, adult-onset, primary open angle glaucoma (POAG) suitable for genetic linkage analysis. POAG is relatively common, affecting around 3% of the Australian population. By finding the large families with POAG and identifying all the descendants in a captive population, it is possible that there may be overlap of different glaucoma pedigrees. Three of the first thirteen families in the study were composed of overlapping pedigrees. In one GIST family, GTas3, there has been intermarriage with other pedigrees with glaucoma on five occasions. The possibility of multiple genotypes was also reinforced by the inability to determine a single glaucoma phenotype in this family. When finding large families of POAG for linkage analysis, researchers must be aware of the risk of affected individuals inheriting their gene from the alternate parent. Thus, the alternate parents or their families must be examined, especially if the phenotype is atypical for the rest of the family.
History
Publication title
Ophthalmic GeneticsVolume
17Issue
4Pagination
209-214ISSN
0167-6784Department/School
Tasmanian School of MedicinePublisher
Aeolus PressPlace of publication
NetherlandsRepository Status
- Restricted