Single-round multiplex PCR with species-specific mitochondrial primers of P. falciparum, P. vivax/P. simium and P. malariae/P. brasilianum: Comparison with standard techniques
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4
Tipo de produção
article
Data de publicação
2022
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Citação
JOURNAL OF MICROBIOLOGICAL METHODS, v.193, article ID 106398, 11p, 2022
Resumo
A single-round multiplex PCR (mPCR) with species-specific primers (SSP) of three mitochondrial genes of Plasmodium, namely COX I, COX III and CYT B, was compared to microscopy and 18S rRNA semi-nested PCR, nested-PCR and Real Time PCRs (*PCRs). Each parasite has between 20 and 150 mitochondria and each mitochondria has one copy of each target gene, while 18S rRNA gene is repeated 4 to 8 times. The specificity of mPCR was assessed by testing Plasmodium from rodents and birds, parasites responsible for other endemic diseases in the country such as schistosomiasis, Chagas disease and leishmaniasis in addition to microorganisms that, like Plasmodium, can cause anemia (Bartonella henselae, Babesia vogeli, Rickettsia vini). No cross-reactions were detected. From a total of 149 specimens from suspected cases of malaria were tested, 97 were positive by microscopy (49 P. falciparum, 38 P. vivax, 6 P. malariae, 4 P. falciparum/P. vivax- mixed infections) and 52 were negative; 148 samples were positive by *PCRs (49 P. falciparum, 53 P. vivax, 7 P. malariae and 39 mixed infections) and one was negative; 146 were positive by mPCR (49 P. falciparum, 56 P. vivax, 9 P. malariae and 32 mixed infections) and three were negative. The comparison of groups found statistically significant differences between microscopy vs.*PCRs or vs. mPCR (p-values <0.0001), but no difference was found between mPCR vs. *PCRs (p=0.946). The agreement in the identification of Plasmodium species was only regular, with Kappa indices of 0.407 (microscopy vs. *PCRs), 0.433 (microscopy vs. mPCR) and 0.558 (*PCRs vs. mPCR). In conclusion, the diagnostic performance of mPCR was comparable to those of *PCRs, and superior to microscopy, although the identification of Plasmodium species showed many disagreements. In conclusion, a sensitive and specific one-round SSP multiplex PCR, capable of simultaneously detecting and identifying P. falciparum, P. vivax/P. simium and P. malariae/P. brasilianum may be useful in resource-constrained countries where quantitative amplifications are not yet fully accessible.
Palavras-chave
Malaria, Mitochondrial genes, Plasmodium species, Species-specific primers, Sequence-specific primers (SSP), Multiplex-PCR
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Coleções
Artigos e Materiais de Revistas Científicas - FM/MPE
Artigos e Materiais de Revistas Científicas - FM/MIP
Artigos e Materiais de Revistas Científicas - HC/ICHC
Artigos e Materiais de Revistas Científicas - LIM/48
Artigos e Materiais de Revistas Científicas - LIM/49
Artigos e Materiais de Revistas Científicas - ODS/03
Artigos e Materiais de Revistas Científicas - FM/MIP
Artigos e Materiais de Revistas Científicas - HC/ICHC
Artigos e Materiais de Revistas Científicas - LIM/48
Artigos e Materiais de Revistas Científicas - LIM/49
Artigos e Materiais de Revistas Científicas - ODS/03