两例结节性硬化症的基因突变分析

Analysis of Gene Mutations in Two Patients with Tuberous Sclerosis Complex

目的检测两例中国汉族结节性硬化症散发病例的基因突变位点。方法采用聚合酶链反应扩增结节性硬化症患者、患者家庭中的正常人及100例健康对照的TSC1和TSC2基因的全部外显子,并进行DNA序列分析。结果患者ⅠTSC2基因第268位碱基由胞嘧啶(C)变成胸腺嘧啶(T),导致第90位氨基酸谷氨酰胺处提前出现终止密码子;患者ⅡTSC2基因第5227位碱基由胞嘧啶(C)变成胸腺嘧啶(T),导致第1743位精氨酸被色氨酸替代;而患者家庭中的正常人和100例健康对照均无此改变。结论无义突变c.268C>T和错义突变c.5227C>T可能是导致这两例患者临床表型的主要原因。

Objective To analyze the mutation of TSC gene in two sporadic patients with tuberous sclerosis complex （TSC）. Methods All the coding exons of TSC1 and TSC2 genes of these two patients, unaffected member in the two families, and 100 unrelated population-matched controls were amplified by polymerase chain reaction. The products were analyzed by direct sequencing. Result Two TSC2 gene mutations （c. 268C 〉 T, c. 5 227C 〉 T） were identified in two patients, but not in their family members and in 100 unrelated population-matched controls. Conclusion These two mutations are the cause of the clinical phenotypes of these two sporadic patients with TSC.