检验医学 ›› 2020, Vol. 35 ›› Issue (11): 1115-1119.DOI: 10.3969/j.issn.1673-8640.2020.11.008

• 临床应用研究·论著 • 上一篇    下一篇

肌酸激酶MM同工酶在新生儿杜氏肌营养不良症筛查中的应用

王燕敏, 田国力, 纪伟, 张潇分   

  1. 上海市儿童医院新生儿筛查中心,上海 200040
  • 收稿日期:2020-01-23 出版日期:2020-11-30 发布日期:2020-12-01
  • 作者简介:null

    作者简介:王燕敏,女,1982年生,学士,主管技师,主要从事新生儿遗传代谢病筛查工作。

  • 基金资助:
    国家自然科学基金青年科学基金项目(21803009);上海市科学技术委员会科研项目(18441905100);上海市重中之重临床重点专科建设项目(2017ZZ02019)

Application of creatine kinase isoenzyme MM in screening neonatal Duchenne muscular dystrophy

WANG Yanmin, TIAN Guoli, JI Wei, ZHANG Xiaofen   

  1. Neonatal Screening Center,Shanghai Children's Hospital,Shanghai 200040,China
  • Received:2020-01-23 Online:2020-11-30 Published:2020-12-01

摘要:

目的 评估肌酸激酶MM同工酶(CK-MM)用于新生儿杜氏肌营养不良症(DMD)筛查的可行性。方法 收集男性新生儿滤纸干血片样本7 035份,采用时间分辨荧光法检测CK-MM,对筛查阳性的样本进行DMD基因检测。对时间分辨荧光法检测CK-MM的性能(正确度、精密度、线性范围等)进行验证。采用受试者工作特征(ROC)曲线评价CK-MM筛查DMD的效能。结果 时间分辨荧光法检测CK-MM的批内CV、批间CV和平均偏移均<10%,线性回归方程为Y=1.045 8X+1.929 6(r=0.999 9,P<0.01)。DMD患儿CK-MM浓度明显高于正常对照组(P<0.000 1),是正常对照组的67倍。7 035例男性新生儿筛查阳性6例(0.085%),确诊2例,DMD基因检测结果显示均为半合变异,基因型分别为c.1990C>T(p.Gln664*)和c.7657C>T(p.Arg2553*)。ROC曲线分析结果显示,CK-MM诊断DMD的曲线下面积(AUC)为1.0,最佳临界值为762 ng/mL,敏感性为100%,特异性为99.94%。结论 以滤纸干血片为样本检测CK-MM能有效筛查出DMD患儿,且检测方法简便,值得临床推广。

关键词: 肌酸激酶MM同工酶, 杜氏肌营养不良症, 滤纸干血片

Abstract:

Objective To evaluate the feasibility of creatine kinase isoenzyme MM(CK-MM) in neonatal Duchenne muscular dystrophy(DMD) screening. Methods Totally,7 035 dried blood spots of male newborns were collected. CK-MM was determined by time-resolved fluorescence method,and the positive results was determined by DMD gene determination further. The performance(accuracy,precision,linear range and so on) of CK-MM determined by time-resolved fluorescence method was verified. The efficiency of CK-MM in screening DMD was evaluated by receiver operating characteristic(ROC) curve. Results The within-run coefficient of variation(CV),the between-run CV and average bias of CK-MM determined by time-resolved fluorescence method were <10%. The linear regression equation was Y= 1.045 8X+1.929 6(r=0.999 9,P<0.01). The concentration of CK-MM in children with DMD was higher than that in healthy control group(P<0.000 1),which was 67 times higher than that of healthy control group. Among the 7 035 male newborns,6(0.085%) cases were positive after screening,and 2 cases were confirmed. DMD gene determination results showed that all of them were hemizygous mutation,and their genotypes were c.1990C>T(p.Gln664*)and c.7657C>T(p.Arg2553*). ROC curve analysis showed that the area under curve(AUC) of CK-MM for the diagnosis of DMD was 1.0,the optimal cut-off value was 762 ng/mL,the sensitivity was 100%,and the specificity was 99.94%. Conclusions Using dried blood spots to determine CK-MM can effectively screen the children with DMD,and this method is simple and worthy of clinical application.

Key words: Creatine kinase isoenzyme MM, Duchenne muscular dystrophy, Dried blood spot

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