Genotyping of trypanosoma cruzi: systematic selection of assays allowing rapid and accurate discrimination of all known lineages

Lewis, M.D., Ma, J., Yeo, M., Carrasco, H.J., Llewellyn, M.S. and Miles, M.A. (2009) Genotyping of trypanosoma cruzi: systematic selection of assays allowing rapid and accurate discrimination of all known lineages. American Journal of Tropical Medicine and Hygiene, 81(6), pp. 1041-1049. (doi: 10.4269/ajtmh.2009.09-0305) (PMID:19996435) (PMCID:PMC2825677)

Abstract

rypanosoma cruzi, the agent of Chagas disease, can be subdivided into six discrete typing units (DTUs), TcI, TcIIa, TcIIb, TcIIc, TcIId or TcIIe, each having distinct epidemiologically important features. Dozens of genetic markers are available to determine the DTU to which a T. cruzi isolate belongs, but there is no consensus on which should be used. We selected five assays: three polymerase chain reaction (PCR)-restriction fragment length polymorphisms based on single nucleotide polymorphisms (SNPs) in the HSP60, Histone H1, and GPI loci, and PCR product size polymorphism of the LSU rDNA and mini-exon loci. Each assay was tested for its capacity to differentiate between DTUs using a panel of 48 genetically diverse T. cruzi clones. Some markers allowed unequivocal identification of individual DTUs, however, only by using a combination of multiple markers could all six DTUs be resolved. Based upon the results we recommend a triple-assay comprising the LSU rDNA, HSP60 and GPI markers for reliable, rapid, low-cost DTU assignment.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Llewellyn, Professor Martin
• Authors: Lewis, M.D., Ma, J., Yeo, M., Carrasco, H.J., Llewellyn, M.S., and Miles, M.A.
• College/School: College of Medical Veterinary and Life Sciences > School of Life Sciences
• Journal Name: American Journal of Tropical Medicine and Hygiene
• Publisher: American Society of Tropical Medicine and Hygiene
• ISSN: 0002-9637
• ISSN (Online): 1476-1645