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目的：就Ｌｅｂｅｒ遗传性视神经病变（Ｌｅｂｅｒ′ｓｈｅｒｅｄｉｔａｒｙｏｐｔｉｃｎｅｕｒｏｐａｔｈｙ，ＬＨＯＮ）进行了线粒体ＤＮＡ的探讨。方法：应用聚酶链反应（ｐｏｌｙｍｅｒａｓｅｃｈａｉｎｒｅａｃｔｉｏｎ，ＰＣＲ）方式对ＬＨＯＮ一家系１１人以及非ＬＨＯＮ家系的对照者４人进行了线粒体ＤＮＡ的分析。结果：ＬＨＯＮ患者有限制性内切酶ＳｆａＮＩ酶切位点丧失，家系中女性是此病的遗传基因的携带者。结论：Ｌｅｂｅｒ遗传性视神经病变患者存在线粒体的点突变，造成限制性内切酶ＳｆａＮＩ酶切位点丧失，这一改变是本病的发病机制之一。
Objective: To investigate mitochondrial DNA in Leber’s hereditary optic neuropathy (LHON). Methods: Mitochondrial DNA was analyzed by polymerase chain reaction (PCR) method in 11 individuals of LHON family and 4 persons of non-LHON family. RESULTS: LHON patients had a loss of SfaNI restriction site, and women in the pedigree were carriers of the gene for the disease. Conclusion: Mitochondrial point mutations exist in patients with Leber’s hereditary optic neuropathy, resulting in the loss of SfaNI restriction sites. This change is one of the pathogenesis of this disease.