目的 用 Ion Torrent 半导体测序技术对 11 个血友病 B(HB)家系的 F9 基因进行序列分析,寻找致病突变,并为遗传咨 询和产前诊断提供依据。方法 采集 11 个 HB 家系先证者及女性成员的外周血样本,抽提基因组 DNA,利用 Ion Torrent 半导 体测序技术检测 F9基因致病突变,对发现的致病突变进行 Sanger 测序验证。进一步对 7 例高危家系孕妇进行羊膜腔穿刺, 采集胎儿羊水样本,并进行产前诊断。结果 13 例 HB 患者均存在 F9基因致病性突变,共发现 10 种突变,其中 1 种为新的突 变类型。对 8 例胎儿进行产前诊断,其中 1 例为半合子突变,2 例为杂合突变,5 例不携带母源致病突变。结论 用 Ion Torrent 半导体测序技术检测 F9基因的突变谱,对于 HB 家系携带者的产前诊断具有一定的临床意义。
Objective To sequence F9 gene in 11 pedigrees with hemophilia B by Ion Torrent semiconductor sequencing technology to analyze and detect pathogenic mutations to provide evidences for genetic counselling and prenatal diagnosis. Methods The peripheral blood samples were collected from probands and female family members,and genomic DNA was extratced and subjected to Ion Torrent sequencing analysis for pathogenic mutations of F9 gene. The identified pathogenic F9 gene mutations were confirmed by Sanger se quencing analysis. Furthermore,amniocentesis was performed in 7 pregnant women from highrisk families and the amniotic fluid sam ples were colletced for prenatal diagnosis. Results In total,we identified 10 pathogenic F9 gene mutations from 13 hemophilia B pa tients,among which one was novel mutation type that had not been reported before. The resuts of prenatal diagnosis for 8 of the fetuses showed that one fetus was hemizygous mutation,two were heterozygous and five were wild type without pathogenic mutations from mater nal source. Conclusion Ion Torrent semiconductor sequencing technology in detection of mutation spectrum of F9 gene shows a certain clinical significance for the prenatal diagnosis of hemophilia B family carriers. Our study not only provides evidencees for genetic coun selling and prenatal diagnosis,but also expands the mutational spectrum of F9 gene.
刘安,马定远,刘刚,林颍,李璃,许争峰,钟天鹰.用 Ion Torrent 半导体测序技术对血友病 B 家系 F9 基因行突变分析及产前诊断[J].临床检验杂志,2021,39(9):641-645