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Related Concept Videos

Malaria01:29

Malaria

Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...

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Analysis of Single-cell Gene Transcription by RNA Fluorescent In Situ Hybridization FISH
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FIT-PNAs as RNA-Sensing Probes for Drug-Resistant Plasmodium falciparum.

Odelia Tepper1, Itamar Peled1, Yair Fastman2

  • 1The Institute for Drug Research, The School of Pharmacy, The Faculty of Medicine, The Hebrew University of Jerusalem, Hadassah Ein-Kerem, Jerusalem 9112102, Israel.

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New FIT-PNAs detect malaria drug resistance at the single-nucleotide level. These probes identify specific gene mutations in Plasmodium falciparum, enabling rapid malaria diagnosis and treatment selection.

Keywords:
FIT-PNASNPartemisininchloroquinedrug resistancemalaria

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Area of Science:

  • Molecular Biology
  • Parasitology
  • Biochemistry

Background:

  • Single-nucleotide resolution RNA detection is challenging.
  • Plasmodium falciparum causes severe malaria and develops drug resistance.
  • Drug resistance in P. falciparum is often linked to single-nucleotide polymorphisms (SNPs).

Purpose of the Study:

  • To develop and validate forced-intercalation peptide nucleic acids (FIT-PNAs) for detecting specific SNPs associated with drug resistance in P. falciparum.
  • To assess the cell permeability and discriminatory capability of FIT-PNAs in infected red blood cells (iRBCs).

Main Methods:

  • Synthesis of FIT-PNAs targeting K13 (C580Y) and CRT (K76T) SNPs in P. falciparum.
  • Conjugation of FIT-PNAs to a cell-penetrating peptide (CPP) for enhanced cell permeability.
  • Incubation of FIT-PNAs with live P. falciparum strains (wild-type and mutant) and analysis using FACS and confocal microscopy.

Main Results:

  • FIT-PNAs successfully targeted and hybridized to specific RNA sequences corresponding to SNPs.
  • FIT-PNAs conjugated with CPPs demonstrated cell permeability into iRBCs.
  • A clear difference in fluorescence was observed between wild-type and mutant P. falciparum strains, indicating successful discrimination of drug-resistant markers.

Conclusions:

  • FIT-PNAs can accurately detect SNPs associated with artemisinin and chloroquine resistance in P. falciparum.
  • FIT-PNAs offer a potential for fast, simple, and cost-effective malaria drug resistance assessment.
  • This technology could aid in selecting optimal antimalarial treatments in endemic regions.