Your browser doesn't support javascript.
loading
Evaluation of three different DNA extraction methods from blood samples collected in dried filter paper in Plasmodium subpatent infections from the Amazon region in Brazil / Avaliação de três métodos de extração de DNA obtidos de amostras de sangue coletadas em papel de filtro em infecções subpatentes de Plasmodium da região Amazônica no Brasil
Miguel, Renata Bortolasse; Coura, José Rodrigues; Samudio, Franklyn; Suárez-Mutis, Martha Cecília.
  • Miguel, Renata Bortolasse; renatab_miguel@yahoo.com.br.
  • Coura, José Rodrigues; renatab_miguel@yahoo.com.br.
  • Samudio, Franklyn; renatab_miguel@yahoo.com.br.
  • Suárez-Mutis, Martha Cecília; renatab_miguel@yahoo.com.br.
Rev. Inst. Med. Trop. Säo Paulo ; 55(3): 205-208, May-Jun/2013. tab
Article in English | LILACS | ID: lil-674692
ABSTRACT
Asymptomatic Plasmodium infection is a new challenge for public health in the American region. The polymerase chain reaction (PCR) is the best method for diagnosing subpatent parasitemias. In endemic areas, blood collection is hampered by geographical distances and deficient transport and storage conditions of the samples. Because DNA extraction from blood collected on filter paper is an efficient method for molecular studies in high parasitemic individuals, we investigated whether the technique could be an alternative for Plasmodium diagnosis among asymptomatic and pauciparasitemic subjects. In this report we compared three different methods (Chelex®-saponin, methanol and TRIS-EDTA) of DNA extraction from blood collected on filter paper from asymptomatic Plasmodium-infected individuals. Polymerase chain reaction assays for detection of Plasmodium species showed the best results when the Chelex®-saponin method was used. Even though the sensitivity of detection was approximately 66% and 31% for P. falciparum and P. vivax, respectively, this method did not show the effectiveness in DNA extraction required for molecular diagnosis of Plasmodium. The development of better methods for extracting DNA from blood collected on filter paper is important for the diagnosis of subpatent malarial infections in remote areas and would contribute to establishing the epidemiology of this form of infection.
RESUMO
Infecção assintomática por Plasmodium é um novo desafio para a saúde pública no Brasil. A reação em cadeia da polimerase (PCR) é o melhor método para detectar baixas parasitemias presentes em pacientes com infecção assintomática. Nas áreas endêmicas, a coleta de sangue total é dificultada pela distancia geográfica, transporte e adequada armazenagem das amostras. A coleta de sangue em papel de filtro pode ser uma alternativa nessas áreas de difícil acesso. Neste estudo foram comparados três diferentes métodos de extração de ADN a partir de papel de filtro usando como controle extração a partir de sangue total. O protocolo Chelex®-Saponina foi o que obteve o melhor resultado quando comparado com os outros três protocolos. No entanto a sensibilidade foi de 66,7% para o P. falciparum e 31,6% para o P. vivax. Conclui-se que em caso de infecção assintomática o papel de filtro não é ainda uma boa alternativa para coleta de amostras.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Plasmodium falciparum / Plasmodium vivax / DNA, Protozoan / Malaria, Vivax / Malaria, Falciparum Type of study: Diagnostic study / Practice guideline Limits: Humans Country/Region as subject: South America / Brazil Language: English Journal: Rev. Inst. Med. Trop. Säo Paulo Journal subject: Tropical Medicine Year: 2013 Type: Article

Similar

MEDLINE

...
LILACS

LIS


Full text: Available Index: LILACS (Americas) Main subject: Plasmodium falciparum / Plasmodium vivax / DNA, Protozoan / Malaria, Vivax / Malaria, Falciparum Type of study: Diagnostic study / Practice guideline Limits: Humans Country/Region as subject: South America / Brazil Language: English Journal: Rev. Inst. Med. Trop. Säo Paulo Journal subject: Tropical Medicine Year: 2013 Type: Article