• Skip to primary navigation
  • Skip to main content
  • Skip to footer
  • Pessoal
    • Webmail
    • Área de Docentes
    • Área de Não-Docentes
  • Estudantes
    • Webmail
    • Moodle
    • NetP@
    • Biblioteca
    • Escola Doutoral
    • Serviços Académicos
    • Trabalhar no IHMT

IHMT

Instituto de Higiene e Medicina Tropical

  • O Instituto
    • Missão
    • História
    • Mensagem do Diretor
    • Órgãos de governo
    • Docentes e investigadores
    • Unidades de Ensino e de Investigação
  • Ensino
    • Doutoramentos
    • Mestrados
    • Cursos de Especialização
    • Formação transversal
    • Cursos de Curta Duração
    • Ensino à Distância
    • Apoio ao Desenvolvimento
    • Serviços académicos
  • Investigação
    • Centro GHTM
    • Unidade de Clínica Tropical
    • Unidade de Microbiologia Médica
    • Unidade de Parasitologia Médica
    • Unidade de Saúde Pública Global
    • Serviço de Interesse Comum
    • Biobanco
    • Centro Colaborador da OMS
    • Publicações
  • Serviços e gestão
    • Biblioteca
    • Sistema de Qualidade
    • Estatutos e regulamentos
    • Relatórios
    • Contratos públicos
    • Recursos humanos
      • Concursos e bolsas
      • Contratos
      • Avaliação e Desempenho
        • Processo Eleitoral da Comissão Paritária
      • Mobilidade
  • Doenças Tropicais
    • Consulta do Viajante
    • Glossário
    • Museu
    • Vídeos
    • MosquitoWeb
  • Comunidade
    • Cooperação e Desenvolvimento
    • Formação
    • Parcerias
  • Contactos
  • Português
  • English
Home / Publicações / Multilocus sequence typing (MLST) for lineage assignment and high resolution diversity studies in Trypanosoma cruzi.

Multilocus sequence typing (MLST) for lineage assignment and high resolution diversity studies in Trypanosoma cruzi.

  • Autores: Acosta N, Bhattacharyya T, Carrasco HJ, Diosque P, Lewis MD, Llewellyn MS, Mauricio IL, Messenger LA, Miles MA, Yeo M
  • Ano de Publicação: 2011
  • Journal: Plos Neglected Tropical Diseases
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/?term=Multilocus+sequence+typing+(MLST)+for+lineage+assignment+and+high+resolution+diversity+studies+in+Trypanosoma+cruzi

BACKGROUND:
Multilocus sequence typing (MLST) is a powerful and highly discriminatory method for analysing pathogen population structure and epidemiology. Trypanosoma cruzi, the protozoan agent of American trypanosomiasis (Chagas disease), has remarkable genetic and ecological diversity. A standardised MLST protocol that is suitable for assignment of T. cruzi isolates to genetic lineage and for higher resolution diversity studies has not been developed.

METHODOLOGY/PRINCIPAL FINDINGS:
We have sequenced and diplotyped nine single copy housekeeping genes and assessed their value as part of a systematic MLST scheme for T. cruzi. A minimum panel of four MLST targets (Met-III, RB19, TcGPXII, and DHFR-TS) was shown to provide unambiguous assignment of isolates to the six known T. cruzi lineages (Discrete Typing Units, DTUs TcI-TcVI). In addition, we recommend six MLST targets (Met-II, Met-III, RB19, TcMPX, DHFR-TS, and TR) for more in depth diversity studies on the basis that diploid sequence typing (DST) with this expanded panel distinguished 38 out of 39 reference isolates. Phylogenetic analysis implies a subdivision between North and South American TcIV isolates. Single Nucleotide Polymorphism (SNP) data revealed high levels of heterozygosity among DTUs TcI, TcIII, TcIV and, for three targets, putative corresponding homozygous and heterozygous loci within DTUs TcI and TcIII. Furthermore, individual gene trees gave incongruent topologies at inter- and intra-DTU levels, inconsistent with a model of strict clonality.

CONCLUSIONS/SIGNIFICANCE:
We demonstrate the value of systematic MLST diplotyping for describing inter-DTU relationships and for higher resolution diversity studies of T. cruzi, including presence of recombination events. The high levels of heterozygosity will facilitate future population genetics analysis based on MLST haplotypes.

Multilocus sequence typing (MLST) for lineage assignment and high resolution diversity studies in Trypanosoma cruzi.

  • Autores: Acosta N, Bhattacharyya T, Carrasco HJ, Diosque P, Lewis MD, Llewellyn MS, Mauricio IL, Messenger LA, Miles MA, Yeo M
  • Ano de Publicação: 2011
  • Journal: Plos Neglected Tropical Diseases
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/?term=Multilocus+sequence+typing+(MLST)+for+lineage+assignment+and+high+resolution+diversity+studies+in+Trypanosoma+cruzi

BACKGROUND:
Multilocus sequence typing (MLST) is a powerful and highly discriminatory method for analysing pathogen population structure and epidemiology. Trypanosoma cruzi, the protozoan agent of American trypanosomiasis (Chagas disease), has remarkable genetic and ecological diversity. A standardised MLST protocol that is suitable for assignment of T. cruzi isolates to genetic lineage and for higher resolution diversity studies has not been developed.

METHODOLOGY/PRINCIPAL FINDINGS:
We have sequenced and diplotyped nine single copy housekeeping genes and assessed their value as part of a systematic MLST scheme for T. cruzi. A minimum panel of four MLST targets (Met-III, RB19, TcGPXII, and DHFR-TS) was shown to provide unambiguous assignment of isolates to the six known T. cruzi lineages (Discrete Typing Units, DTUs TcI-TcVI). In addition, we recommend six MLST targets (Met-II, Met-III, RB19, TcMPX, DHFR-TS, and TR) for more in depth diversity studies on the basis that diploid sequence typing (DST) with this expanded panel distinguished 38 out of 39 reference isolates. Phylogenetic analysis implies a subdivision between North and South American TcIV isolates. Single Nucleotide Polymorphism (SNP) data revealed high levels of heterozygosity among DTUs TcI, TcIII, TcIV and, for three targets, putative corresponding homozygous and heterozygous loci within DTUs TcI and TcIII. Furthermore, individual gene trees gave incongruent topologies at inter- and intra-DTU levels, inconsistent with a model of strict clonality.

CONCLUSIONS/SIGNIFICANCE:
We demonstrate the value of systematic MLST diplotyping for describing inter-DTU relationships and for higher resolution diversity studies of T. cruzi, including presence of recombination events. The high levels of heterozygosity will facilitate future population genetics analysis based on MLST haplotypes.

Footer

INSTITUTO DE HIGIENE E
MEDICINA TROPICAL
UNIVERSIDADE NOVA DE LISBOA
Rua da Junqueira, 100 1349-008 Lisboa
T +351 213 652 600
geral@ihmt.unl.pt

Consulta do Viajante e Medicina Tropical
T +351 213 652 630
T +351 213 652 690
T +351 91 182 37 48
T +351 91 182 44 67
medicina.viagens@ihmt.unl.pt

Ensino
Investigação
Medicina Tropical
Cooperação

Siga-nos

  • Facebook
  • LinkedIn
  • YouTube

Receber a “newsletter”

© Copyright 2023 IHMT-UNL Todos os Direitos Reservados.
  • Universidade Nova de Lisboa
  • Fundação para a Ciência e a Tecnologia

    Project UID/Multi/04413/2013