NASBA (molecular biology)

NASBA全稱:nucleic acid sequence-based amplification ,依賴核酸序列的擴增技術依賴核酸序列的擴增技術,是一種擴增RNA的新技術,是由一對引物介導的、連續均一的、體外特異核苷酸序列等溫擴增的酶促反應過程.反應在42℃進行,可以在2h左右將模板RNA擴增約10^9~12倍,不需特殊的儀器.NASBA已經廣泛套用於細菌、病毒等多種病原微生物的檢測.

最早在1991年,被 J Compton 定義為:a primer-dependent technology that can be used for the continuous amplification of nucleic acids in a single mixture at one temperature

該技術一出現就被用於疾病的快速診斷和病人血清中HIV-1的定量檢測。

儘管RNA的擴增也可以使用反轉錄PCR技術(通過反轉錄形成單鏈DNA模板),NASBA相比則有自己的優勢:可以在相對恆溫的條件下進行(一般恆溫為41攝氏度)。

該技術用於醫學診斷,相對傳統的PCR技術更為穩定,準確。

基本介紹

  • 外文名:NASBA (molecular biology)
  • 技術:依賴核酸序列的擴增技術
  • 1991年:被 J Compton 定義
  • 特點:PCR技術更為穩定,準確
簡要過程,參考文獻,

簡要過程

NASBA的簡要過程 如下:
1.RNA模板鏈進入反應混合物後,第一個引物首先與模板鏈的3'端結束
2. 反轉錄酶,合成反義,補償的DNA鏈
3. RNA 酶H,分解破壞RNA模板鏈(僅分解與DNA雜交結合的RNA鏈,不分解單鏈RNA)
4.第二個引物與DNA的5‘端結合
5.T7 RNA polymerase 合成RNA補償鏈,並加入到步驟1中,使反應可以循環進行。
NASBA技術已經被用於多個單鏈RNA基因組的病原性病毒的快速檢測試驗中,e.g. influenza A, foot-and-mouth disease virus, severe acute respiratory syndrome (SARS)-associated coronavirus, Human bocavirus(HBoV) and also parasites like Trypanosoma brucei.

參考文獻

1Compton, J (1991). "Nucleic acid sequence-based amplification". Nature350 (6313): 91–2. doi:10.1038/350091a0. PMID1706072.^Kievits, T; Van Gemen, B; Van Strijp, D; Schukkink, R; Dircks, M; Adriaanse, H; Malek, L; Sooknanan, R et al. (1991).
"NASBA isothermal enzymatic in vitro nucleic acid amplification optimized for the diagnosis of HIV-1 infection". Journal of virological methods35 (3): 273–86. PMID1726172.^Schneider, P; Wolters, L; Schoone, G; Schallig, H; Sillekens, P; Hermsen, R; Sauerwein, R (2005).
"Real-time nucleic acid sequence-based amplification is more convenient than real-time PCR for quantification of Plasmodium falciparum". Journal of clinical microbiology43 (1): 402–5. doi:10.1128/JCM.43.1.402-405.2005. PMC540116. PMID15635001.Collins, RA; Ko, LS; So, KL; Ellis, T; Lau, LT; Yu, AC (2002).
"Detection of highly pathogenic and low pathogenic avian influenza subtype H5 (Eurasian lineage) using NASBA". Journal of virological methods103 (2): 213–25. PMID12008015.^Collins, RA; Ko, LS; Fung, KY; Lau, LT; Xing, J; Yu, AC (2002). "A method to detect major serotypes of foot-and-mouth disease virus". Biochemical and biophysical research communications297 (2): 267–74. PMID12237113.^Keightley, MC; Sillekens, P; Schippers, W; Rinaldo, C; George, KS (2005).
"Real-time NASBA detection of SARS-associated coronavirus and comparison with real-time reverse transcription-PCR". Journal of medical virology77 (4): 602–8. doi:10.1002/jmv.20498. PMID16254971.^B�hmer, A; Schildgen, V; L�sebrink, J; Ziegler, S; Tillmann, RL; Kleines, M; Schildgen, O (2009).
"Novel application for isothermal nucleic acid sequence-based amplification (NASBA)". Journal of virological methods158 (1-2): 199–201. doi:10.1016/j.jviromet.2009.02.010. PMID19428591.^Mugasa, CM; Laurent, T; Schoone, GJ; Kager, PA; Lubega, GW; Schallig, HD (2009).
"Nucleic acid sequence-based amplification with oligochromatography for detection of Trypanosoma brucei in clinical samples". Journal of clinical microbiology47 (3): 630–5. doi:10.1128/JCM.01430-08. PMC2650916. PMID19116352.

熱門詞條

聯絡我們