A large GLC1C Greek family with a myocilin T377M mutation: Inheritance and phenotypic variability

Michael B. Petersen, George Kitsos, John R. Samples, N. Donna Gaudette, Effrosini Economou-Petersen, Renée Sykes, Kristal Rust, Maria Grigoriadou, George Aperis, Dongseok Choi, Konstantinos Psilas, Jamie E. Craig, Patricia L. Kramer, David A. Mackey, Mary K. Wirtz

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


PURPOSE. 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.

Original languageEnglish (US)
Pages (from-to)620-625
Number of pages6
JournalInvestigative Ophthalmology and Visual Science
Issue number2
StatePublished - Feb 2006

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


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