基础医学与临床 ›› 2022, Vol. 42 ›› Issue (1): 139-144.doi: 10.16352/j.issn.1001-6325.2022.01.024

• 临床研究 • 上一篇    下一篇

CLIP-PCR直接检测血液中疟原虫雌性配子体特异转录产物s25 mRNA

杨珺源, 骈红茹, 杨明珠, 郑直*   

  1. 中国医学科学院基础医学研究所 北京协和医学院基础学院 生物化学与分子生物学系,北京 100005
  • 收稿日期:2021-10-08 修回日期:2021-11-22 出版日期:2022-01-05 发布日期:2022-01-05
  • 通讯作者: * zhizheng100@126.com
  • 基金资助:
    国家科技重大专项(2018ZX10101001-001-005);中国医学科学院医学与健康科技创新(2018-I2M-1-001);国家自然科学基金(81902167)

Direct detection of Plasmodium female gametocyte-specific transcript s25 mRNA in blood by CLIP-PCR

YANG Jun-yuan, PIAN Hong-ru, YANG Ming-zhu, ZHENG Zhi*   

  1. Department of Molecular Biology and Biochemistry, Institute of Basic Medical Sciences CAMS, School of Basic Medicine PUMC, Beijing 100005, China
  • Received:2021-10-08 Revised:2021-11-22 Online:2022-01-05 Published:2022-01-05
  • Contact: * zhizheng100@126.com

摘要: 目的 建立一种疟原虫雌性配子体的分子检测法。方法 根据疟原虫雌性配子体特异性mRNA靶标(待测靶序列)即动合子表面蛋白(s25)的转录产物,设计特异性的捕获探针和连接探针。血液样品经裂解释放的mRNAs,无需核酸提取,通过“三明治”杂交被捕获到96孔板表面。洗去未结合探针后,将结合在mRNA靶标上的连接探针进行连接,得到两端为特殊设计序列的单链扩增模板。再用通用引物进行染料法qPCR扩增,或在端部设计TaqMan探针序列,用通用引物和通用TaqMan探针进行探针法qPCR扩增。评价这一基于捕获和连接扩增的方法(CLIP-PCR)的灵敏度、特异性和重复性并与普通的RT-qPCR方法进行比较,将其应用于临床样品的检测。结果 该CLIP-PCR具有较高的灵敏度和特异性。与普通的RT-qPCR一样,均可检测低至11拷贝数的s25 mRNA靶标;而且该CLIP-PCR操作更简便。该CLIP-PCR可准确检测到疟疾患者血液中的雌性配子体。可将96个样品的检测时间缩短至3 h。结论 建立了灵敏高效的染料法和通用TaqMan探针法CLIP-PCR检测疟原虫雌性配子体,为疟疾传播的控制、配子体大规模筛查奠定了基础。

关键词: 疟原虫, 配子体, 检测方法, 捕获, 连接

Abstract: Objective To establish a molecular detection method for the Plasmodium female gametocyte. Methods Probes for capture and ligation probe-PCR (CLIP-PCR) were specific designed based on Plasmodium female gametocyte special RNA targets, which were the transcripts of the ookinetes surface protein (s25). After the whole blood cells were lysed, the RNA targets were directly released and captured on the 96-well plate by “sandwich” hybridization without extraction. Washing away the unbound probes, the ligation probes which also hybridized to the RNA target were ligated to form a single-strand amplification template with specific-designed sequence at both ends. The SYBR Green qPCR was carried out with universal primers. Or with TaqMan probe binding sequence was designed at the end of the templates, the TaqMan qPCR was carried out with universal primers and universal fluorescent probes. The sensitivity, specificity and repeatability of CLIP-PCR were evaluated and compared with the RT-qPCR. And it was also used to detect a small number of clinical samples. Results This method was successfully applied to detect s25 mRNA with high sensitivity and specificity. Both RT-qPCR and CLIP-PCR could detect s25 mRNA targets as low as 11 copies. However, CLIP-PCR was simpler compared to RT-qPCR. And it could accurately detect gametocytes in blood of malaria patients. The detection of 96 samples could be completed within 3 h. Conclusions SYBR Green CLIP-PCR and TaqMan CLIP-PCR for the female gametocyte of Plasmodium detection provides a sensitive and efficient method for large-scale screening of gametocytes and control of malaria transmission.

Key words: Plasmodium, gametocyte, detection method, capture, ligation

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