title: A large GLC1C Greek family with a myocilin T377M mutation: inheritance and phenotypic variability.
abstract: OBJECTIVE
  POAG is a complex disease; therefore, families in which a glaucoma gene has been mapped may carry additional POAG genes. The goal of this study was to determine whether mutations in the myocilin (MYOC) gene on chromosome 1 are present in two POAG families, which have previously been mapped to the GLC1C locus on chromosome 3.
  
  
  METHODS
  The three exons of MYOC were screened by denaturing (d)HPLC. Samples with heteroduplex peaks were sequenced. Clinical findings were compared with genotype status in all available family members over the age of 20 years.
  
  
  RESULTS
  A T377M coding sequence change in MYOC was identified in family members of the Greek GLC1C family but not in the Oregon GLC1C family. Individuals carrying both the MYOC T377M variant and the GLC1C haplotype were more severely affected at an earlier age than individuals with just one of the POAG genes, suggesting that these two genes interact or that both contribute to the POAG phenotype in a cumulative way.
authors.affiliation: Department of Genetics, Institute of Child Health, Athens, Greece.
authors.forename: Michael B
authors.initials: MB
authors.lastname: Petersen
authors.forename: George
authors.initials: G
authors.lastname: Kitsos
authors.forename: John R
authors.initials: JR
authors.lastname: Samples
authors.forename: N Donna
authors.initials: ND
authors.lastname: Gaudette
authors.forename: Effrosini
authors.initials: E
authors.lastname: Economou-Petersen
authors.forename: Renée
authors.initials: R
authors.lastname: Sykes
authors.forename: Kristal
authors.initials: K
authors.lastname: Rust
authors.forename: Maria
authors.initials: M
authors.lastname: Grigoriadou
authors.forename: George
authors.initials: G
authors.lastname: Aperis
authors.forename: Dongseok
authors.initials: D
authors.lastname: Choi
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Psilas
authors.forename: Jamie E
authors.initials: JE
authors.lastname: Craig
authors.forename: Patricia L
authors.initials: PL
authors.lastname: Kramer
authors.forename: David A
authors.initials: DA
authors.lastname: Mackey
authors.forename: Mary K
authors.initials: MK
authors.lastname: Wirtz
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002851:Chromatography, High Pressure Liquid; D002878:Chromosomes, Human, Pair 1 / Q000235:genetics*; D002893:Chromosomes, Human, Pair 3 / Q000235:genetics*; D003598:Cytoskeletal Proteins / Q000235:genetics*; D004252:DNA Mutational Analysis; D005091:Exons / Q000235:genetics; D005136:Eye Proteins / Q000235:genetics*; D005260:Female; D005838:Genotype; D005902:Glaucoma, Open-Angle / Q000208:ethnology / Q000235:genetics*; D006023:Glycoproteins / Q000235:genetics*; D006115:Greece / Q000208:ethnology; D006239:Haplotypes; D020180:Heteroduplex Analysis; D006801:Humans; D040582:Inheritance Patterns; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010375:Pedigree; D010641:Phenotype; D016133:Polymerase Chain Reaction; D000099179:Myocilin
chemical_list: D003598:Cytoskeletal Proteins; D005136:Eye Proteins; D006023:Glycoproteins; D000099179:Myocilin