Mutations in fibrillin-1 (FBN1) were detected in an autosomal dominant Marfan syndrome (MFS) pedigree. The related phenotypes and the significance of mutation screening were discussed. Complete medical and cardiovascular examinations for all pedigree members were performed. Whole exons sequencing (WES) was used to sequence the DNA of the patients and their relatives. The potential pathogenic mutation sites were screened by bioinformatics method. Sanger sequencing was used to verify the mutation sites in the pedigree. The results showed that FBN1 missense mutation was c.6806 T>C in exon 56, resulting in isoleucine being replaced by threonine (p. Ile2269Thr). This mutation has not been reported in Chinese Han population. The occurrence of the mutations strongly correlated with the phenotypes of the patients. The results expand the mutation spectrum of FBN1, and it is helpful to further explore the molecular pathogenesis of MFS and MFS related diseases.
本研究检测一个常染色体显性遗传马方综合征（MFS）家族中原纤蛋白1（FBN1）基因的突变，并探讨相关表型及其突变筛选的意义。对该家系所有成员进行体格检查和辅助检查，并进行全外显子测序（WES），生物信息学方法筛选致病突变，Sanger测序验证WES的数据可靠性。结果显示，FBN1的错义突变是由于第56外显子中第6806位的T碱基被C碱基替换（c.6806 T>C），导致处于该位置的异亮氨酸被苏氨酸取代（p.Ile2269Thr），此突变在中国汉族人群中尚未报道。该突变与患者的表型密切相关。综上，本研究结果扩大了FBN1的突变谱，有助于进一步研究MFS和MFS相关疾病的分子发病机制。.