[Preliminary linkage analysis on autosomal dominant microphthalmia with 12 microsatellite markers].
ABSTRACT In this preliminary study a Chinese autosomal dominant microphthalmia family were investigated and the linkage analyses were performed with six previously reported loci (CHX10, MITF, RX, MCOP, NNO1, NNO2) and six microsatellite markers on chromosome 11 as well. The allelic polymorphisms of those microsatellite markers were identified by using polymerase chain reaction, polyacrylamide gel electrophoresis and silver-staining techniques. The LOD scores between microsatellite markers and the disease were obtained by using MLINK software. Our results showed that the linkage between the microphthalmia in this family with the 6 known loci could be excluded, indicating that the defect gene in this microphthalmia family was probably distinct from those of previously reported microphthalmia families.
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ABSTRACT: Congenital microphthalmia is a developmental ocular disorder and might be caused by the mutations in the genes involved in eye development. To uncover the genetic cause in a six-generation Chinese pedigree with autosomal dominant congenital microphthalmia, we performed genescan and linkage analysis in this family. Fourteen microsatellite markers on chromosomes 3, 11, 14 and 15 were selected as genetic markers according to the five previously reported loci associated with microphthalmia (MITF, SOX2, PAX6, MCOP and NNO2). The genomic DNA of each member in the pedigree was amplified with 14 pairs of fluorescence labeled primers. Genome screening and genotyping were conducted on ABI377 DNA sequencer and linkage analysis was performed with Linkage software package. All two-point LOD scores of linkage analysis between the suggested disease genes and microsatellite markers were <−2, which indicated that none of the five genes were responsible for microphthalmia in this Chinese family. Microphthalmia in this family may be caused by mutation in a new gene which is essential in eye development.Chinese Science Bulletin 11/2006; 51(23):2868-2871. · 1.37 Impact Factor
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ABSTRACT: Microphthalmia is a clinically and genetically heterogeneous disorder of eye development. The genetic basis of nonsyndromic microphthalmia is not yet fully understood. Previous studies indicated that disease pedigrees from different genetic backgrounds could be attributed to completely different gene loci. To investigate the etiology in a large autosomal-dominant inherited simple microphthalmia (nanophthalmia) pedigree, which is the first genetically analyzed Chinese microphthalmia pedigree, we performed a whole-genome scan using 382 micro-satellite DNA markers after the exclusion of reported candidates associated with microphthalmia. Strong evidence indicated that microphthalmia in this family was mapped to an unreported new locus on chromosome 2q. A significantly positive two-point LOD score was obtained with a maximum 3.290 at a recombination fraction of 0.00 for marker D2S2265. Subsequent haplotype analysis and recombination data further confined the disease-causing gene to a 15-cM interval between D2S1890 and D2S347 on 2q11-14. Our results further underlined the degree of heterogeneity in microphthalmia from Chinese background and localized a novel gene which regulates eye embryogenesis.Human Genetics 02/2008; 122(6):589-93. · 4.63 Impact Factor