【摘要】 一型先天性眼外肌纤维化(Congenitalfibrosisoftheextraocularmuscles,CFEOM)是一种罕见的常染色体显性遗传的眼肌疾病,临床上主要表现为动眼神经缺陷而引起的斜视。本研究鉴定了具有四代病人的一个呈常染色体显性遗传的CFEOM1家系,连锁分析表明致病基因与染色体12q处的微卫星标记D12S85紧密连锁,最大LOD值为2.1。对D12S85附近的CFEOM1基因KIF21A进行突变检测,在KIF21A基因第21个外显子发现有一C→T的碱基替换,该变化引起KIF21A基因的第954位密码子由精氨酸突变为色氨酸,SSCP结果表明该家系中的所有患者都具有这一突变,而在家系中的所有正常人以及150个正常汉人对照中则不能检测到这一改变。我们的研究表明,KIF21A的p.Arg954Trp突变是引起这一先天性眼外肌纤维化家系病人患病的致病原因。更多还原

【Abstract】 Congenital fibrosis of the extraocular muscles type 1 (CFEOM1) is an autosomal dominant strabismus disorder associated with defects of the oculomotor nerve. In this study, we identified a Chinese family with CFEOM1 for four generations. Linkage analy-sis mapped the causative gene of the family to 12q with a Lod score 2.1 for polymorphic marker D12S85, where KIF21A is located. Direct DNA sequence analysis identified a 2860C→T change in exon 21, resulting in a tryptophan substitution for arginine in codon 954 of KIF21A. SSCP (single-stranded conformational polymorphism) analysis showed that mutation p.Arg954Trp of KIF21A co-segregated with the affected members, but was absent in the unaffected individuals in the family and 150 normal controls. Our re-sults indicate that mutation p.Arg954Trp of the KIF21A is the genetic basis of the Chinese family with CFEOM1.更多还原