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Dennis S. C. Lam, Yuk Fai Leung, John K. H. Chua, Larry Baum, Dorothy S. P. Fan, Kwong Wai Choy, Chi Pui Pang; Truncations in the TIGR Gene in Individuals with and without Primary Open-Angle Glaucoma. Invest. Ophthalmol. Vis. Sci. 2000;41(6):1386-1391.
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purpose. To investigate the coding exons in the trabecular meshwork–induced
glucocorticoid response protein (TIGR) gene for
mutations in primary open-angle glaucoma (POAG) in Chinese subjects.
methods. Ninety-one Chinese patients with POAG and 113 of their family members
without glaucoma were screened for sequence alterations in the TIGR gene by polymerase chain reaction,
conformation-sensitive gel electrophoresis, and DNA sequencing. One
hundred thirty-two unrelated individuals without glaucoma, aged 50
years or more, were studied as control subjects.
results. Five sequence variants that lead to amino acid changes were identified.
One was novel: Arg91Stop in one patient with POAG. Four had been
reported: Arg46Stop in subjects with and without POAG, including an
unaffected 77-year-old woman homozygous for Arg46Stop; Gly12Arg in
subjects without glaucoma; and Asp208Glu and Thr353Ile in subjects with
and without POAG. The previously reported 1-83(G→A) and Arg76Lys
polymorphisms were detected in both patients and controls and always
conclusions. A different pattern of TIGR sequence variants exists in
the Chinese than in non-Chinese populations. No common TIGR mutation that causes POAG was found. The occurrence
of subjects without glaucoma who are heterozygous or homozygous for
Arg46Stop suggests that reduction in the amount of TIGR protein does
not cause glaucoma. Thus, the TIGR missense mutations
known to cause POAG probably do not cause glaucoma by inactivating a
normal TIGR function, but rather through the gain of a pathologic
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