The mutations were detected by direct DNA sequencing. Results All samples examined carried mtDNA A1555G mutation in 12SrRNA gene and G7444A mutation in COI/tRNASer(UCN) gene.

• 结果测序结果表明,此家系线粒体DNA12SrRNA基因中存在着A1555G突变,COI/tRNASer(UCN)基因中存在着G7444A突变。