| Association of Polymorphic Regulatory Region of TIGR Gene with Glaucoma. |
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Hyung Jin Koo, Sungsoo Son, Changwon Kee |
1Department of Ophthalmology, Kangwon National University Hospital.
2Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. |
| TIGR 유전자 전사조절부위의 유전적 다형성과 녹내장과의 상관성 |
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구형진(Hyung Jin Koo),손성수(Sung Soo Son),기창원(Chang Won Kee) |
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| Abstract |
PURPOSE
To identify the polymorphism in the regulatory region of trabecular meshwork inducible glucocorticoid response(TIGR) gene and evaluate the association of it with glaucoma. METHODS: 5'regulatory region of TIGR gene of 101 normal persons and 91 unrelated glaucoma patients were analyzed by DNA sequencing and restriction enzyme digestion. To know the possible effects of the polymorphism on the transcription rate of TIGR gene, electrophoretic mobility shift assay and luciferase reporter gene assay were performed with cultured cells, and their extracts of trabecular meshwork and ciliary body in which the gene was expressed. RESULTS: Of the 480 bp examined, G to A transition(G-241A) located at 241 bp upstream from transcription start site was identified and its frequency of occurrence was proved to be higher in steroid induced glaucoma patients(18.9%) compared with that in normal population(8.9%), POAG(8.3%) and normal tension glaucoma patients(6.7%, P<0.05). In mobility shift assay, the G-241A probe was proved to have affinity to some DNA-binding proteins and its affinity was revealed to be two times stronger than that of normal sequence. The luciferase activities, however, were observed to be similar in cells transfected with vectors having normal promoter sequence or G-241A containing one. CONCLUSION: The result suggest that G-241A itself is not a cause of steroid-induced glaucoma but is in linkage disequilibrium with the actual causes of the disease. |
| Key Words:
TIGR gene;DNA sequencing;Restriction enzyme digestion;Electrophoretic mobility shift assay;Luciferase reporter gene assay;Steroid induced glaucoma |
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