DNA multigene sequencing of topotypic specimens of the fascioliasis vector Lymnaea diaphana and phylogenetic analysis of the genus Pectinidens (Gastropoda)
Mem. Inst. Oswaldo Cruz
;
107(1): 111-124, Feb. 2012. ilus, tab
Article
Dans Anglais
| LILACS
| ID: lil-612814
ABSTRACT
Freshwater lymnaeid snails are crucial in defining transmission and epidemiology of fascioliasis. In South America, human endemic areas are related to high altitudes in Andean regions. The species Lymnaea diaphana has, however, been involved in low altitude areas of Chile, Argentina and Peru where human infection also occurs. Complete nuclear ribosomal DNA 18S, internal transcribed spacer (ITS)-2 and ITS-1 and fragments of mitochondrial DNA 16S and cytochrome c oxidase (cox)1 genes of L. diaphana specimens from its type locality offered 1,848, 495, 520, 424 and 672 bp long sequences. Comparisons with New and Old World Galba/Fossaria, Palaearctic stagnicolines, Nearctic stagnicolines, Old World Radix and Pseudosuccinea allowed to conclude that (i) L. diaphana shows sequences very different from all other lymnaeids, (ii) each marker allows its differentiation, except cox1 amino acid sequence, and (iii) L. diaphana is not a fossarine lymnaeid, but rather an archaic relict form derived from the oldest North American stagnicoline ancestors. Phylogeny and large genetic distances support the genus Pectinidens as the first stagnicoline representative in the southern hemisphere, including colonization of extreme world regions, as most southern Patagonia, long time ago. The phylogenetic link of L. diaphana with the stagnicoline group may give light to the aforementioned peculiar low altitude epidemiological scenario of fascioliasis.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Analyse de séquence d'ADN
/
Espaceur de l'ADN ribosomique
/
Vecteurs de maladies
/
Fasciolase
/
Lymnea
Limites du sujet:
Animaux
Pays comme sujet:
Amérique du Sud
/
Chili
langue:
Anglais
Texte intégral:
Mem. Inst. Oswaldo Cruz
Thème du journal:
Médecine tropicale
/
Parasitologie
Année:
2012
Type:
Article
Pays d'affiliation:
Argentine
/
Espagne
Institution/Pays d'affiliation:
Universidad Juan Agustín Maza/AR
/
Universidad de Valencia/ES
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