苯丙酮尿症患儿苯丙氨酸羟化酶基因突变的研究

发布时间：2018-08-03 06:54

【摘要】：目的了解宁夏地区苯丙酮尿症(PKU)儿童苯丙氨酸羟化酶(PAH)基因突变的特征。方法以经新生儿疾病筛查及气相色谱-质谱联用技术确诊的30例宁夏PKU儿童为病例组,30例正常儿童为对照组,应用PCR技术扩增PAH基因的3、5、6、7、11和12,六个外显子,再经单链构象多态性分析和DNA测序分析PCR扩增产物。结果在60个等位基因中检出51个突变基因,检出率85%;六个外显子共检出16种致病突变,包括8种错义突变(R241C、R243Q、R252Q、G 257 V、R359K*、R408Q、R 413 P、Q419R),3种剪接突变(IVS 4-1 GA、Y 204 C、IVS 7+2 TA),3种无义突变(R 111 X、Q160X、Y356X),1种同义突变(V399V)和1种缺失突变(N183del);R243Q突变频率最高,检出率为18.3%,其次是Y 204 C(11.7%)、IVS 4-1 GA(10.0%)、R 111 X(6.7%)和IVS 7+2 TA(6.7%)。病例组中发现Exon 6的N183del(C.547-549del GAA)缺失突变和Exon 11的R359K(C.1078GA)错义突变,为国内首次发现;病例组和对照组中均检出V245V(C.735GA)和Q232Q(C.696AG)两种静止突变,且差异无统计学意义(P0.05)。结论宁夏PKU儿童PAH基因六个外显子最常见的突变类型是错义突变,特别是R243Q;发现中国人群PAH基因的2种新的突变。
[Abstract]:Objective to investigate the characteristics of phenylalanine hydroxylase (PAH) gene mutation in children with phenylketonuria (PKU) in Ningxia. Methods A total of 30 cases of Ningxia PKU children confirmed by neonatal disease screening and gas chromatography-mass spectrometry were selected as control group. The exons of PAH gene were amplified by PCR technique. The amplified products of PCR were analyzed by single strand conformation polymorphism (SSCP) and DNA sequencing. Results 51 mutation genes were detected in 60 alleles, the detectable rate was 85, and 16 pathogenicity mutations were detected in six exons. 鍖呮嫭8绉嶉敊涔夌獊鍙，

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