Deletions of pfhrp2 and pfhrp3 genes of Plasmodium falciparum from Honduras, Guatemala and Nicaragua. 2018

Gustavo Fontecha, and Rosa E Mejía, and Engels Banegas, and Maria Paz Ade, and Lisandro Mendoza, and Bryan Ortiz, and Isaac Sabillón, and Gerardo Alvarado, and Gabriela Matamoros, and Alejandra Pinto
Microbiology Research Institute, Universidad Nacional Autonoma de Honduras, Tegucigalpa, Honduras. gustavo.fontecha@unah.edu.hn.

BACKGROUND Malaria remains a public health problem in some countries of Central America. Rapid diagnostic tests (RDTs) are one of the most useful tools to assist in the diagnosis of malaria in remote areas. Since its introduction, a wide variety of RDTs have been developed for the detection of different parasite antigens. PfHRP2 is the most targeted antigen for the detection of Plasmodium falciparum infections. Genetic mutations and gene deletions are important factors influencing or affecting the performance of rapid diagnostic tests. METHODS In order to demonstrate the presence or absence of the pfhrp2 and pfhrp3 genes and their flanking regions, a total of 128 blood samples from patients with P. falciparum infection from three Central American countries were analysed through nested or semi-nested PCR approaches. RESULTS In total, 25.8 and 91.4% of the isolates lacked the region located between exon 1 and exon 2 of pfhrp2 and pfhrp3 genes, respectively. Parasites from the three countries showed deletions of one or both genes. The highest proportion of pfhrp2 deletions was found in Nicaragua while the isolates from Guatemala revealed the lowest number of pfhrp2 deletions. Parasites collected from Honduras showed the highest proportion of phfrp3 absence (96.2%). Twenty-one percent of isolates were double negative mutants for the exon 1-2 segment of both genes, and 6.3% of isolates lacked the full-length coding region of both genes. CONCLUSIONS This study provides molecular evidence of the existence of P. falciparum isolates lacking the pfhrp2 and pfhrp3 genes, and their flanking regions, in Honduras, Guatemala and Nicaragua. This finding could hinder progress in the control and elimination of malaria in Central America. Continuous evaluation of RDTs and molecular surveillance would be recommended.

UI MeSH Term Description Entries
D009527 Nicaragua A country in CENTRAL AMERICA, bordering both the Caribbean Sea and the North Pacific Ocean, between COSTA RICA and HONDURAS.
D010963 Plasmodium falciparum A species of protozoa that is the causal agent of falciparum malaria (MALARIA, FALCIPARUM). It is most prevalent in the tropics and subtropics. Plasmodium falciparums,falciparums, Plasmodium
D006166 Guatemala A country in CENTRAL AMERICA bordering the North Pacific Ocean, between EL SALVADOR and MEXICO, and bordering the Gulf of Honduras (Caribbean Sea) between HONDURAS and BELIZE.
D006721 Honduras A country in CENTRAL AMERICA, bordering the Caribbean Sea, between GUATEMALA and NICARAGUA and bordering the Gulf of Fonseca (North Pacific Ocean), between EL SALVADOR and NICARAGUA.
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000953 Antigens, Protozoan Any part or derivative of any protozoan that elicits immunity; malaria (Plasmodium) and trypanosome antigens are presently the most frequently encountered. Protozoan Antigens
D001483 Base Sequence The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence. DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA
D015800 Protozoan Proteins Proteins found in any species of protozoan. Proteins, Protozoan
D017384 Sequence Deletion Deletion of sequences of nucleic acids from the genetic material of an individual. Deletion Mutation,Deletion Mutations,Deletion, Sequence,Deletions, Sequence,Mutation, Deletion,Mutations, Deletion,Sequence Deletions
D021901 DNA, Intergenic Any of the DNA in between gene-coding DNA, including untranslated regions, 5' and 3' flanking regions, INTRONS, non-functional pseudogenes, and non-functional repetitive sequences. This DNA may or may not encode regulatory functions. DNA, Junk,DNA, Spacer,Intergenic DNA,Junk DNA,Spacer DNA,Intercistronic Region,Intercistronic Sequence,Intergenic Region,Intergenic Sequence,Sequence, Intergenic,DNAs, Intergenic,DNAs, Junk,DNAs, Spacer,Intercistronic Regions,Intercistronic Sequences,Intergenic DNAs,Intergenic Regions,Intergenic Sequences,Junk DNAs,Region, Intercistronic,Region, Intergenic,Regions, Intercistronic,Regions, Intergenic,Sequence, Intercistronic,Sequences, Intercistronic,Sequences, Intergenic,Spacer DNAs

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