Mutation analysis of GCDH gene in eight patients with glutaric aciduria type Ⅰ

目的 分析8例戊二酸尿症Ⅰ型(glutaric aciduria type Ⅰ,GA-1)患者的GCDH基因突变情况.方法 对8例经尿液及血液生化检查诊断为GA-1的患者及其部分家系成员,采集外周静脉血,应用蛋白酶K-盐析法提取DNA,PCR产物直接测序法,进行GCDH基因的所有外显子及侧翼序列的突变筛查.结果 8例GA-1患者中,7例为经典的婴幼儿发病,1例为成年晚发型.基因分析证实8例先证者均存在GCDH基因突变,其中5例为复合杂合性突变,符合隐性遗传;另3例只发现1个杂合性突变位点.共发现9种突变类型,其中c.148T＞C、c.371G＞A、909 delC和c.263G＞A是4个新的突变位点.结论 首次在国内报道8例GA-1患者携带GCDH基因突变,其中1例为罕见的成年晚发型.发现了4个新的突变位点,丰富了GCDH基因的突变谱.Objective To investigate the mutations of glutaryl-CoA dehydrogenase (GCDH) gene in patients with glutaric aciduria type Ⅰ (GA-1). Methods Genomic DNA was extracted from peripheral blood cells of the eight probands with GA-1 who were diagnosed by urine and blood analyses. By PCR and direct sequencing, all 11 exons and their flanking sequences of the GCDH gene were examined. Mutation search was also performed in some of their family members. Results Among the eight patients diagnosed by metabolic screening, seven patients belonged to classical infantile-onset. One patient, however, was adultonset, who was admitted to the hospital because of suffering from ischemic cerebral stroke. The GCDH gene mutations were identified in all the eight probands with GA-1: five of them had compound heterozygous mutations, while the other three harbored only one heterozygous mutation. Totally, nine different mutations of the GCDH gene were identified in the eight probands, four of them were novel, i. e. , c. 148T＞C,c. 371G＞A, 909delC and c. 263G＞A. Conclusion GCDH gene mutations are identified in 8 patients with GA-1 in mainland China, including one adult patient with late onset. Four novel mutations of GCDH gene are found which expanded the mutational spectrum of the GCDH gene.PubMed中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)04374-3782