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Molecular genetic diversity of Gongylonema neoplasticum (Fibiger & Ditlevsen, 1914) (Spirurida: Gongylonematidae) from rodents in Southeast Asia

Setsuda Aogu, Ribas Alexis, Chaisiri Kittipong, Morand Serge, Chou Monidarin, Malbas Fidelino, Yunus Muchammad, Sato Hiroshi. 2018. Molecular genetic diversity of Gongylonema neoplasticum (Fibiger & Ditlevsen, 1914) (Spirurida: Gongylonematidae) from rodents in Southeast Asia. Systematic Parasitology, 95 (2-3) : 235-247.

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Quartile : Q3, Sujet : PARASITOLOGY

Résumé : More than a dozen Gongylonema spp. (Spirurida: Spiruroidea: Gongylonematidae) have been described from a variety of rodent hosts worldwide. Gongylonema neoplasticum (Fibiger & Ditlevsen, 1914), which dwells in the gastric mucosa of rats such as Rattus norvegicus (Berkenhout) and Rattus rattus (Linnaeus), is currently regarded as a cosmopolitan nematode in accordance with global dispersion of its definitive hosts beyond Asia. To facilitate the reliable specific differentiation of local rodent Gongylonema spp. from the cosmopolitan congener, the genetic characterisation of G. neoplasticum from Asian Rattus spp. in the original endemic area should be considered since the morphological identification of Gongylonema spp. is often difficult due to variations of critical phenotypical characters, e.g. spicule lengths and numbers of caudal papillae. In the present study, morphologically identified G. neoplasticum from 114 rats of seven species from Southeast Asia were selected from archived survey materials from almost 4,500 rodents: Thailand (58 rats), Cambodia (52 rats), Laos (three rats) and Philippines (one rat). In addition, several specimens from four rats in Indonesia were used in the study. Nucleotide sequences of the ribosomal RNA gene (rDNA) (5,649 bp) and the cytochrome c oxidase subunit 1 gene (cox1) (818 bp) were characterised. The rDNA showed little nucleotide variation, including the internal transcribed spacer (ITS) regions. The cox1 showed 24 haplotypes, with up to 15 (1.83%) nucleotide substitutions regardless of parasite origin. Considering that Rattus spp. have been shown to originate from the southern region of Asia and G. neoplasticum is their endogenous parasite, it is reasonable to propose that the present study covers a wide spectrum of the genetic diversity of G. neoplasticum, useful for both the molecular genetic speculation of the species and the molecular genetic differentiation of other local rodent Gongylonema spp. from the cosmopolitan congener.

Mots-clés géographiques Agrovoc : Cambodge, République démocratique populaire lao, Philippines, Thaïlande

Classification Agris : L72 - Organismes nuisibles des animaux
L60 - Taxonomie et géographie animales

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Setsuda Aogu, Yamaguchi University (JPN)
  • Ribas Alexis, Universitat Autonoma de Barcelona (ESP)
  • Chaisiri Kittipong, Mahidol University (THA)
  • Morand Serge, CNRS (THA) ORCID: 0000-0003-3986-7659
  • Chou Monidarin, University of Health Sciences of Cambodia (KHM)
  • Malbas Fidelino, ITM (PHL)
  • Yunus Muchammad, Airlangga University (IDN)
  • Sato Hiroshi, Yamaguchi University (JPN) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/588755/)

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