畜牧兽医学报 ›› 2016, Vol. 47 ›› Issue (4): 752-761.doi: 10.11843/j.issn.0366-6964.2016.04.015

• 预防兽医 • 上一篇    下一篇

猪病毒性腹泻检测基因芯片的两种样品标记技术比较

马锐1#,尹人杰1,2#,黄小波1*,文心田1,杨国淋1,常晓霞1,张仙1,滑翔1,赵玉佳1,曹三杰1,文翼平1,伍锐1   

  1. (1.四川农业大学动物医学院,猪病研究中心与基因芯片实验室,成都 611130;2.四川省崇州市农村发展局,崇州 611200)
  • 收稿日期:2015-08-10 出版日期:2016-04-23 发布日期:2016-04-23
  • 通讯作者: 黄小波,教授,E-mail:rsghb110@126.com
  • 作者简介:马锐(1989-),男,四川成都人,硕士生,主要从事动物传染病研究,E-mail:iwanttogetsci@163.com;尹人杰(1989-),为本文共同第一作者
  • 基金资助:

    公益性行业(农业)科研专项项目(201203056)

Comparision of Two Fluorescence-labeling Methods of Porcine Diarrheal Viruses Detection Microarrays

MA Rui1# ,YIN Ren-jie1,2# ,HUANG Xiao-bo1* ,WEN Xin-tian1,YANG Guo-lin1,CHANG Xiao-xia1,ZHANG Xian1,HUA Xiang1,ZHAO Yu-jia1,CAO San-jie1,WEN Yi-ping1,WU Rui1   

  1. (1.Porcine Disease Research Center and Microarray Laboratory,College of Veterinary Medicine,Sichuan Agricultural University,Chengdu 611130,China;2.Institute of Rural Developmen of Chongzhou,Chongzhou 611200,China)
  • Received:2015-08-10 Online:2016-04-23 Published:2016-04-23

摘要:

对猪病毒性腹泻检测芯片的两种样品标记方法进行比较。分别选取猪流行性腹泻病毒(PEDV)的SM基因,猪传染性胃肠炎病毒(TGEV)的NS基因,A型猪轮状病毒(GAR)的VP7和NSP4基因设计引物,用PCR扩增制备靶基因,纯化后制备猪病毒性腹泻联合检测基因芯片。提取样品核酸,采用Cy3直接标记法和间接标记法进行PCR扩增标记,标记的样品再与芯片杂交、扫描和数据分析,同时对两种标记方法的特异性、敏感性等进行了比较。结果表明,两种方法标记的样品均能与基因芯片特异性杂交,但直接法的中位信号值(median)均高于间接法的中位信号值,直接法的芯片杂交信噪比是用间接法的5倍以上。两种标记方法制备样品特异性好,猪蓝耳病毒、猪瘟病毒、猪乙型脑炎病毒、猪伪狂犬病毒验证检测为阴性;直接法和间接法的最低检测浓度分别为105和107 copies•μL-1,前者的灵敏性是后者的100倍。应用优化的直接标记法处理56份临床样品,进行芯片的检测应用,结果与RT-PCR一致。本研究结果表明直接法荧光标记样品可明显提高病毒性腹泻检测芯片的检测效果。

Abstract:

Two samples labeling methods of microarray detection for diarrheal viruses are compared respectively in this study.Primers were designed based on the sequences of S and M gene of Porcine Epidemic Diarrhea Virus(PEDV),S and N gene of Transmissible Gastroenteritis Virus(TGEV),VP7 and NSP4 gene of Group A Porcine Rotavirus(GAR),and then were used to amplify the target genes by PCR.The target genes were purified using ethanol precipitation to manufacture simultaneous detection microarray.Fluorescence molecules were imported to PCR products by direct-labeling method and indirect-labeling method respectively after extraction of virus RNA from samples.The specificity and sensitivity of two labeling methods were compared by scanning and analyzing the results after PCR products hybridized with microarray.The results showed that microarray based on two different labeling methods could both hybridize with target genes with high specificity.However,the median signal volumes of direct-labeling were higher than those of indirect-labeling and Signal to Noise Ratio(SNR) of direct-labeling was more than five times higher compared with that of indirect-labeling.Specific test results showed that two labeling methods were both specific and CSFV,PRRSV,PCV-2,JEV detection showed negative result.Sensitivity test results suggested that the sensitivity of direct-labeling were 100 times higher than that of indirect-labeling.The minimum concentration of direct-labeling method and indirect-labeling method can be detected reliably were 105 copies•μL-1 and 107 copies•μL-1,respectively.A total of 56 clinical samples were treated with direct-labeling and hybridized with the microarray,the results were consistent with those of RT-PCR.This study indicate that direct-labeling technology could effectively improve the detection effect of diarrhea microarray.

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