CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES >
Establishment and application of loop-mediated isothermal amplification for detection of Leishmania
Received date: 2024-01-08
Revised date: 2024-03-01
Online published: 2024-07-16
Supported by
Wuhan Municipal Health and Family Planning Commission Medical Research Project(WG17B04);Wuhan Municipal Health and Family Planning Commission Medical Research Project(WG18Q05);Seventh Batch of Young and Middle-aged Medical Backbone Talent Training Projects of Wuhan Municipal Health and Health Commission
A method for detecting Leishmania based on loop-mediated isothermal amplification (LAMP) was established to support for the prevention and treatment of visceral leishmaniasis. According to the sequence of the kinetoplast 5.8S ribosomal RNA of Leishmania (GenBank: OP829811), specific primers for LAMP were designed and synthesized, and the LAMP method was established. The DNA of blood samples from patients infected with Plasmodium falciparum, P. vivax, P. malariae, P. ovale and healthy individuals, as well as the promastigote DNA of Schistosoma japonicum, Toxoplasma gondii, and L. donovani, were detected by the LAMP method to evaluate the specificity. The promastigote DNA of L. donovani was diluted to 1 ng/μl, 100 pg/μl, 10 pg/μl, 1 pg/μl, 100 fg/μl, 10 fg/μl, and 1 fg/μl to determine the minimum detection limit of the LAMP method and the effect of the presence or absence of calcein on the detection limit. LAMP method and real-time fluorescence quantitative PCR (qPCR) were used to detect blood samples from patients with unexplained fever and healthy people. Bone marrow smears of positive patients were stained by Giemsa to find Leishmania amastigotes. The established LAMP method could detect L. donovani DNA, and the reaction results were green; the results of detecting blood samples of patients infected with 4 species of Plasmodium and healthy people, as well as S. japonicum and T. gondii DNA were all negative, and orange. A total of 46 healthy blood samples were tested by the LAMP method, all of which were negative, without cross-reaction, and with high specificity. After reaction at 65 ℃ for 60 min, the detection limits without and with calcein were 1 pg/μl and 1 ng/μl, respectively. The average peak values of turbidity rates without and with calcein were 0.194 and 0.120, and the time of turbidity after adding calcein was delayed by an average of 23.6 min compared with that without calcein. The LAMP method and qPCR method were used to detect 67 blood samples from patients with fever, of which the same 2 samples were positive. The bone marrow smears corresponding to the same two positive blood samples were examined under a microscope and Leishmania amastigotes were found. The LAMP method for detecting Leishmania is easy to operate, has high sensitivity and specificity, and the test results are visible, which has good promotion and application value.
JIA Xishuai , ZHOU Shuimao , LUO Huatang , LIU Cong , WANG Shuai , XU Wenxiu . Establishment and application of loop-mediated isothermal amplification for detection of Leishmania[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2024 , 42(3) : 413 -417 . DOI: 10.12140/j.issn.1000-7423.2024.03.019
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