Volume 11 Supplement 1

Challenges in malaria research

Open Access

Multiplicity and diversity of Plasmodium falciparum gametocytes

  • Rahel Wampfler1,
  • Lincoln Timinao1, 2,
  • Ivo Mueller2, 3 and
  • Ingrid Felger1
Malaria Journal201211(Suppl 1):P100

https://doi.org/10.1186/1475-2875-11-S1-P100

Published: 15 October 2012

Background

Discrimination of gametocyte-producing P. falciparum clones depends on high expression of one or more polymorphic stage-specific markers and on the genetic diversity of these markers in the study area. Pfs230 and pfg377 are classical length-polymorphic markers for differentiation of gametocytes. Because of variable PCR fragment sizes, these markers are particularly well suited to distinguish gametocytes of multiple P. falciparum clones within a patient. We aimed at improving the resolution of both markers by creating amplicons spanning several polymorphic domains of these genes and by increasing the sizing accuracy by capillary electrophoresis using an automated sequencer.

Material and methods

We assessed the genetic diversity and the multiplicity of pfs230 and pfg377 in 80 DNA samples from Papua New Guinea by nested-PCR and following sizing by capillary electrophoresis. We also investigated novel size-polymorphic gametocyte markers, such as PF11.1 (PF10_0374), PF11_0214, PFI0205w and PFL0105w, as well as SNP-based genotyping approaches.

Results

We observed high diversity with pfs230 (He=96.3) and pfg377 (He=89.4). 17 and 13 different alleles were found for pfs230 and pfg377, respectively. The multiplicity of infection (MOI) of pfs230 and pfg377 was compared with the asexual MOI by marker msp2 for each sample.

Discussion

Gametocyte typing of field samples requires RNA sampling and high gametocyte-specific expression of the genotyping marker. A gametocyte trendline was used to evaluate the detection limit of the nested-RT-PCR of pfs230 and pfg377 in comparison to the standard marker for gametocyte detection, pfs25. We discuss the application of high-resolution gametocyte genotyping for studies on malaria transmission.

Authors’ Affiliations

(1)
Swiss Tropical and Public Health Institute
(2)
Papua New Guinea Institute of Medical Research
(3)
Walter and Eliza Hall Institute

Copyright

© Wampfler et al; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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