title: A major marker for normal tension glaucoma: association with polymorphisms in the OPA1 gene.
abstract: Normal tension glaucoma (NTG) is a major form of glaucoma, associated with intraocular pressures that are within the statistically normal range of the population. OPA1, the gene responsible for autosomal dominant optic atrophy represents an excellent candidate gene for NTG, as the clinical phenotypes are similar and OPA1 is expressed in the retina and optic nerve. Eighty-three well-characterized NTG patients were screened for mutations in OPA1 by heteroduplex analysis and bi-directional sequencing. Sequences found to be altered in NTG subjects were examined for variations in 100 population controls. A second cohort of 80 NTG patients and 86 population controls was subsequently screened to determine whether the initial findings could be replicated. A single nucleotide polymorphism (SNP) on intervening sequence (IVS) 8 (IVS8 + 4 C/T) was found to be strongly associated with the occurrence of NTG in both cohorts (chi(2)=7.97, P=0.005 in the first cohort, chi(2)=9.93, P=0.002 in the second cohort; odds ratio 3.1 (95% CI: 1.8-5.6). A second SNP (IVS8 + 32 T/C) appeared to be associated with disease in the first cohort (chi(2)=4.71, P=0.030), but this finding could not be replicated in the second cohort. In the combined cohort, the compound at-risk genotype IVS8 + 4 C/T, + 32 T/C was strongly associated with the occurrence of NTG (chi(2)=22.04, P=0.00001 after correcting for testing four genotypes). These results indicate that polymorphisms in the OPA1 gene are associated with NTG and may be a marker for the disease.
authors.affiliation: Singapore National Eye Centre, Singapore. tin11@pacific.net.sg
authors.forename: Tin
authors.initials: T
authors.lastname: Aung
authors.forename: Louise
authors.initials: L
authors.lastname: Ocaka
authors.forename: Neil D
authors.initials: ND
authors.lastname: Ebenezer
authors.forename: Alex G
authors.initials: AG
authors.lastname: Morris
authors.forename: Michael
authors.initials: M
authors.lastname: Krawczak
authors.forename: Dawn L
authors.initials: DL
authors.lastname: Thiselton
authors.forename: Christiane
authors.initials: C
authors.lastname: Alexander
authors.forename: Marcela
authors.initials: M
authors.lastname: Votruba
authors.forename: Glen
authors.initials: G
authors.lastname: Brice
authors.forename: Anne H
authors.initials: AH
authors.lastname: Child
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Francis
authors.forename: Roger A
authors.initials: RA
authors.lastname: Hitchings
authors.forename: Ordan J
authors.initials: OJ
authors.lastname: Lehmann
authors.forename: Shomi S
authors.initials: SS
authors.lastname: Bhattacharya
mesh_terms: D001483:Base Sequence; D015331:Cohort Studies; D005819:Genetic Markers; D005838:Genotype; D005901:Glaucoma / Q000235:genetics*; D006801:Humans; D008131:London; D008868:Microtubule Proteins; D009900:Optic Nerve / Q000378:metabolism; D010750:Phosphoproteins / Q000235:genetics*; D011110:Polymorphism, Genetic; D020641:Polymorphism, Single Nucleotide; D012016:Reference Values; D012160:Retina / Q000378:metabolism; D050777:Stathmin; D044465:White People / Q000235:genetics
chemical_list: D005819:Genetic Markers; D008868:Microtubule Proteins; D010750:Phosphoproteins; C493995:STMN1 protein, human; D050777:Stathmin