Plasmodium falciparum malarial parasites from Brazil lack artemisinin resistance-associated mutations in the kelch13 gene

Abstract

INTRODUCTION

Mutations in the propeller domain of the Plasmodium falciparum kelch13 (k13) gene are associated with artemisinin resistance.

METHODS:

We developed a PCR protocol to sequence the pfk13 gene and determined its sequence in a batch of 50 samples collected from 2003 to 2016 in Brazil.

RESULTS:

We identified 1 K189T substitution located outside the propeller domain of the PfK13 protein in 36% of samples.

CONCLUSIONS:

Although the sample size is relatively small, these results suggest that P. falciparum artemisinin-resistant mutants do not exist in Brazil, thereby supporting the continuation of current treatment programs based on artemisinin-based combination therapy.

Keywords:
Malaria; Plasmodium falciparum; Artemisinin Resistance; Kelch 13