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

IHMT

Instituto de Higiene e Medicina Tropical

  • O Instituto
    • Missão
    • Mensagem do Diretor
    • Órgãos de governo
    • Docentes e investigadores
    • Portal de Denúncias UNL
  • Ensino
    • Mestrados
    • Doutoramentos
    • Cursos de Especialização
    • Formação transversal
    • Cursos de Curta Duração
    • Ensino à Distância
    • Apoio ao Desenvolvimento
    • Serviços académicos
    • NOVA Open Academy
  • Investigação
    • Centro GHTM
    • Unidades de Ensino e de Investigação (UEI)
      • Unidade de Clínica Tropical
      • Unidade de Microbiologia Médica
      • Unidade de Parasitologia Médica
      • Unidade de Saúde Pública Global
      • Serviço de Apoio à Ciência e Comunidade
    • Biobanco
    • BLOODless
    • Centro Colaborador OMS
    • Publicações
  • Serviços e gestão
    • Biblioteca
    • Sistema de Qualidade
    • Estatutos e regulamentos
    • Plano de Atividades
    • Relatório de Atividades
    • Relatório de Gestão
    • Contratos públicos
    • Recursos humanos
      • Concursos e bolsas
        • Concursos – Docentes e Investigadores
        • Concursos – Não Docentes e Não Investigadores
        • Bolsas de Investigação
      • Contratos
      • Avaliação de Desempenho
        • Ciclo Avaliativo
          • Biénio 2021-2022
          • Biénio 2023-2024
        • Conselho Coordenador de Avaliação
        • Comissão Paritária
      • Mobilidade
      • Listas Nominativas
  • Doenças Tropicais
    • Consulta do Viajante
    • Dossiês Informativos
    • Glossário
    • Museu
    • Vídeos
    • MosquitoWeb
  • Comunidade
    • Cooperação e Desenvolvimento
    • Formação
    • Parcerias
  • Contactos
  • Candidaturas
  • pt
    • pt
    • en
Home / Publicações / The “far-west” of Anopheles gambiae molecular forms.

The “far-west” of Anopheles gambiae molecular forms.

  • Autores: Besansky NJ, Caputo B, Conway DJ, Della Torre A, Jaenson T, Jawara M, Mancini E, Nwakanma DC, Palsson K, Petrarca V, Pinto J, Santolamazza F, Vicente JL, White BJ
  • Ano de Publicação: 2011
  • Journal: PLoS One
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/?term=The+%E2%80%9Cfar-west%E2%80%9D+of+Anopheles+gambiae+molecular+forms

The main Afrotropical malaria vector, Anopheles gambiae sensu stricto, is undergoing a process of sympatric ecological diversification leading to at least two incipient species (the M and S molecular forms) showing heterogeneous levels of divergence across the genome. The physically unlinked centromeric regions on all three chromosomes of these closely related taxa contain fixed nucleotide differences which have been found in nearly complete linkage disequilibrium in geographic areas of no or low M-S hybridization. Assays diagnostic for SNP and structural differences between M and S forms in the three centromeric regions were applied in samples from the western extreme of their range of sympatry, the only area where high frequencies of putative M/S hybrids have been reported. The results reveal a level of admixture not observed in the rest of the range. In particular, we found: i) heterozygous genotypes at each marker, although at frequencies lower than expected under panmixia; ii) virtually all possible genotypic combinations between markers on different chromosomes, although genetic association was nevertheless detected; iii) discordant M and S genotypes at two X-linked markers near the centromere, suggestive of introgression and inter-locus recombination. These results could be indicative either of a secondary contact zone between M and S, or of the maintenance of ancestral polymorphisms. This issue and the perspectives opened by these results in the study of the M and S incipient speciation process are discussed.

The “far-west” of Anopheles gambiae molecular forms.

  • Autores: Besansky NJ, Caputo B, Conway DJ, Della Torre A, Jaenson T, Jawara M, Mancini E, Nwakanma DC, Palsson K, Petrarca V, Pinto J, Santolamazza F, Vicente JL, White BJ
  • Ano de Publicação: 2011
  • Journal: PLoS One
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/?term=The+%E2%80%9Cfar-west%E2%80%9D+of+Anopheles+gambiae+molecular+forms

The main Afrotropical malaria vector, Anopheles gambiae sensu stricto, is undergoing a process of sympatric ecological diversification leading to at least two incipient species (the M and S molecular forms) showing heterogeneous levels of divergence across the genome. The physically unlinked centromeric regions on all three chromosomes of these closely related taxa contain fixed nucleotide differences which have been found in nearly complete linkage disequilibrium in geographic areas of no or low M-S hybridization. Assays diagnostic for SNP and structural differences between M and S forms in the three centromeric regions were applied in samples from the western extreme of their range of sympatry, the only area where high frequencies of putative M/S hybrids have been reported. The results reveal a level of admixture not observed in the rest of the range. In particular, we found: i) heterozygous genotypes at each marker, although at frequencies lower than expected under panmixia; ii) virtually all possible genotypic combinations between markers on different chromosomes, although genetic association was nevertheless detected; iii) discordant M and S genotypes at two X-linked markers near the centromere, suggestive of introgression and inter-locus recombination. These results could be indicative either of a secondary contact zone between M and S, or of the maintenance of ancestral polymorphisms. This issue and the perspectives opened by these results in the study of the M and S incipient speciation process are discussed.

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
  • Portal de Denúncias UNL

NOVA University of Lisbon Logo

Siga-nos

  • Facebook
  • Instagram
  • LinkedIn
  • Twitter
  • YouTube

Receber a “newsletter”

© Copyright 2025 IHMT-UNL Todos os Direitos Reservados.
  • Universidade Nova de Lisboa
  • Fundação para a Ciência e a Tecnologia

    UIDB/04413/2020
    UIDP/04413/2020

We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.Ok