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机构地区:[1]宁夏回族自治区妇幼保健院,银川750004 [2]兰州军区新疆乌鲁木齐总院临床医学研究所
出 处:《中华医学遗传学杂志》2014年第1期6-10,共5页Chinese Journal of Medical Genetics
基 金:宁夏自然科学基金(NZ13237)
摘 要:目的探讨宁夏回族地区苯丙氨酸羟化酶(phenylalanine hydroxylase,PAH)基因突变特点,为该地区苯丙酮尿症(phenylketonuria,PKU)的基因诊断和产前诊断提供依据。方法应用PCR产物直接测序法,对宁夏地区35例回族PKU患儿和50名正常健康个体的PAH基因第1~13外显子及其旁侧内含子区域进行基因突变分析。结果共检出20种突变类型,包括错义突变8种(40%)、无义突变5种(25%)、剪切位点突变4种(20%)、缺失突变3种(15%),等位基因突变检出率为68.57%(48/70)。最常见的基因突变类型是p.R243Q(12.86%)、p.R241C(11.43%)、EX6-96A〉G(5.71%)、p.Y356X(5.71%)、p.R413P(4.29%)和p.Q232X(4.29%);较常见的突变类型为S16fsX10(2.86%)、p.R111X(2.86%)和p.L430P(2.86%)。其中S16fsX10、p.L430P、p.D222G和IVS11+1G→A突变为国内首次报道,p.Y414X和S303fsX38突变为国内本名族中首次报道。50名正常对照中未检出上述突变。结论宁夏回族地区PAH基因的突变特点有别于我国其他地区,表现出基因突变的多样性、复杂性和地域性,具有显著的民族特色。Objective To determine the type and frequency of phenylalanine hydroxylase gene (PAH) mutations in ethnic Hui patients from Ningxia with phenylketonuria (PKU). Methods For 35 PKU children patients and 50 healthy individuals, all exons and promoters of the PAH gene were analyzed with PCR and direct sequencing. Results Twenty mutations, including 8 missense mutations (40%), 5 nonsense mutations (25%), 4 splice site mutations (20%) and 3 deletion mutants (15%) were discovered. The overall detection rate was 68. 57% (48/70). Common mutations have included R243Q (12. 86%), R241C (11.43%), EX6-96A%G (5.71%), Y356X (5.71%), R413P (4. 29%) and Q232X (4.29%), whilst rarer ones have included S16fsX10 (2.86%), RlllX (2.86%) and L430P (2.86%). Among these, S16fsX10, L430P, D222G and IVS11+1G→A have not been reported previously. Y414X and S303fsX38 have not been reported in Hui ethnic group. No mutation was detected in the 50 normal controls. Conclusion The types and distribution of PAH gene mutations in ethnic Hui from Ningxia have been different from other areas of China. The mutations also showed a rich diversity.
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