苯丙氨酸羟化酶(PAH)基因外显子7及其两侧内含子的突变研究

Mutations in Exon 7 of the Phenylalanine Hydroxylase(PAH)Gene in Chinese Patients with Phenylketonuria

为探讨中国苯丙酮尿症(PKU)人群中苯丙氨酸羟化酶(PAH)基因外显子7的突变特征,对147例PKU患儿的294个PAH基因外显子7以及两侧部分内含子序列,应用PCR 单链构象多态性(SSCP)分析及基因序列分析的方法进行了筛查和确定。共发现13种突变基因:G239D、R241C、R241fs、R243Q、G247S、G247V、R252Q、L255S、R261Q、M276K、E280G、P281L、Ivs7+2T>A,其中7种突变基因在中国PKU人群首次发现;G239D、R241fs、G247S、E280G、L255S、R261Q、P281L,前4种在国际上尚未见到报道,并已提交到国际PAH突变数据库(www.pahdb.mcgill.ca)。突变基因的总频率为30.61%(90/294)。突变涉及了错义、缺失、移码和剪接位点4种突变类型。结果明确了PAH基因外显子7的突变种类和分布等特征,表明外显子7是中国人PAH基因突变的热点区域。

To study mutation in exon 7 of the gene for the phenylalanine hydroxylase(PAH), the mutations in exon 7 and flanking sequence of PAH gene were detected by SSCP analysis and DNA sequencing, in 147 unrelated Chinese children with phynelketonuria and their parents. Thirteen different mutations, including 11 missense, 1 deletion and 1 splice mutation, were revealed in 90/294 mutant alleles (30.61%). The prevalent mutations were R243Q (22.8%) and Ivs7nt2t->a (2.38%). Seven novel mutations were identified:G239D, R241fsdelG, G247S, E280G, L255S, R261Q, P281L. These new mutations have not been described in Chinese PKU population and the first four mutants have not been reported and thus been submitted to www.pahdb,mcgill.ca. The missense was the most common type. The deletion and frameshift mutations were detected for the first time in Chinese PKU population. This study showed the mutation characteristics and their distribution in exon 7 of PAH gene and proved that the exon 7 was the hot region of PAH gene mutation in Chinese PKU population.