Comparison of methods of dna extraction from Giardia spp. measured by conventional PCR

Authors

  • Kathia Tarqui-Terrones Centro Nacional de Salud Pública, Instituto Nacional de Salud. Lima, Perú; Universidad Nacional Mayor de San Marcos. Lima, Perú.
  • Juana I. Silva-Molina Centro Nacional de Salud Pública, Instituto Nacional de Salud. Lima, Perú; Universidad Nacional Mayor de San Marcos. Lima, Perú.
  • María Beltrán-Fabián Centro Nacional de Salud Pública, Instituto Nacional de Salud. Lima, Perú.
  • Silvia Zevallos-Vara Hospital Nacional Sergio E. Bernales. Lima, Perú.
  • Egma Mayta-Huatuco Universidad Nacional Mayor de San Marcos. Lima, Perú.

DOI:

https://doi.org/10.17843/rpmesp.2019.363.4160

Keywords:

Giardia, ADN, Reacción en Cadena de la Polimerasa, Trofozoítos

Abstract

Objectives. To compare different methods of DNA extraction from cysts and trophozoites of Giardia spp. using the conventional polymerase chain reaction (PCR) technique. Materials and Methods. Cysts of Giardia spp. were isolated from 65 coprological samples from national reference hospitals, obtaining an average load of 5x104 parasites. In addition, Giardia intestinalis trophozoites (ATCC® 30957™) were cultured obtaining a 5x106 parasitic load. Eleven extraction methods for cysts and six for trophozoites were compared. The concentration and purity of the extracted DNA were determined by spectrophotometry and the extraction yield was assessed by amplification of the ß-giardin (bg) and glutamate dehydrogenase (gdh) genes with a semi nested PCR assay. Results. It was observed that method 1 showed the highest concentration of DNA from cysts (12.24 ng/µL), purity (1.4) and best performance (bg: 100% amplification; gdh: 60% amplification) compared to the other methods evaluated. In the case of trophozoites, the method without pre treatment showed the highest level of DNA concentration, purity, and yield (26.56 ng/µL; 1.85; 100% amplification of bg and gdh, respectively). Conclusions. Mechanical, thermal shock, and enzymatic pre-treatments are necessary for the rupture of the cystic wall of Giardia spp. making it the highest-yielding bg molecular marker for detecting cyst DNA.  Trophozoites do not require pre-treatment to achieve satisfactory results. A reproducible methodology for the extraction of DNA from Giardia spp. from any evolutionary stage is available.

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Published

2019-08-26

Issue

Section

Original Article

How to Cite

1.
Tarqui-Terrones K, Silva-Molina JI, Beltrán-Fabián M, Zevallos-Vara S, Mayta-Huatuco E. Comparison of methods of dna extraction from Giardia spp. measured by conventional PCR. Rev Peru Med Exp Salud Publica [Internet]. 2019 Aug. 26 [cited 2024 Apr. 14];36(3):423-32. Available from: https://rpmesp.ins.gob.pe/index.php/rpmesp/article/view/4160

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