AIM: To develop a diagnostic DNA chip to detect mutations in the betaigh3 gene causing the most common corneal dystrophies (CDs). METHODS: Samples from 98 people, including patients with betaigh3-associated CDs (beta-aCDs), were examined. Specific primer and probe sets were designed to examine exons 4 and 12 of the betaigh3 gene, in order to identify mutant and wild-type alleles. Mutations were then identified by hybridisation signals of sequence-specific probes immobilised on the slide glass. RESULTS: Direct sequencing of exons 4 and 12 of the betaigh3 gene in the patients' genome showed that beta-aCDs could be mainly classified into five types: homozygotic Avellino corneal dystrophy (ACD), heterozygotic ACD, heterozygotic lattice CD I, heterozygotic Reis-Bucklers CD and heterozygotic granular CD. Blind tests were performed by applying the target DNA amplified from the genomic DNA isolated from the peripheral blood of the participants onto a DNA chip. The results obtained by DNA chip hybridisation matched well with the direct DNA sequencing results. CONCLUSIONS: The DNA chip developed in this study allowed successful detection of beta-aCDs with a sensitivity of 100%. Mutational analysis of exons 4 and 12 of the betaigh3 gene, which are the mutational hot spots causing beta-aCDs, can be successfully performed with the DNA chip. Thus, this DNA chip-based method should allow a convenient, yet highly accurate, diagnosis of beta-aCDs, and can be further applied to diagnose other types of CDs.
AIM: To develop a diagnostic DNA chip to detect mutations in the betaigh3 gene causing the most common corneal dystrophies (CDs). METHODS: Samples from 98 people, including patients with betaigh3-associated CDs (beta-aCDs), were examined. Specific primer and probe sets were designed to examine exons 4 and 12 of the betaigh3 gene, in order to identify mutant and wild-type alleles. Mutations were then identified by hybridisation signals of sequence-specific probes immobilised on the slide glass. RESULTS: Direct sequencing of exons 4 and 12 of the betaigh3 gene in the patients' genome showed that beta-aCDs could be mainly classified into five types: homozygotic Avellino corneal dystrophy (ACD), heterozygotic ACD, heterozygotic lattice CD I, heterozygotic Reis-Bucklers CD and heterozygotic granular CD. Blind tests were performed by applying the target DNA amplified from the genomic DNA isolated from the peripheral blood of the participants onto a DNA chip. The results obtained by DNA chip hybridisation matched well with the direct DNA sequencing results. CONCLUSIONS: The DNA chip developed in this study allowed successful detection of beta-aCDs with a sensitivity of 100%. Mutational analysis of exons 4 and 12 of the betaigh3 gene, which are the mutational hot spots causing beta-aCDs, can be successfully performed with the DNA chip. Thus, this DNA chip-based method should allow a convenient, yet highly accurate, diagnosis of beta-aCDs, and can be further applied to diagnose other types of CDs.
Authors: Georg Mitterer; Martin Huber; Ernst Leidinger; Claudia Kirisits; Werner Lubitz; Manfred W Mueller; Wolfgang M Schmidt Journal: J Clin Microbiol Date: 2004-03 Impact factor: 5.948
Authors: M F El-Ashry; M M Abd El-Aziz; L A Ficker; A J Hardcastle; S S Bhattacharya; N D Ebenezer Journal: Eye (Lond) Date: 2004-07 Impact factor: 3.775
Authors: N A Afshari; J E Mullally; M A Afshari; R F Steinert; A P Adamis; D T Azar; J H Talamo; C H Dohlman; T P Dryja Journal: Arch Ophthalmol Date: 2001-01
Authors: Anthony J Aldave; Julie G Gutmark; Vivek S Yellore; John A Affeldt; Mario A Meallet; Nitin Udar; Narsing A Rao; Kent W Small; Gordon K Klintworth Journal: Am J Ophthalmol Date: 2004-11 Impact factor: 5.258