Diversity of insect trypanosomatids assessed from the spliced leader RNA and 5S rRNA genes and intergenic regions
We have determined the sequences of 5S rRNA and spliced leader (SL) RNA genes, and adjacent intergenic regions for representatives of all known trypanosomatid genera parasitizing insects. The genetic loci have been analyzed separately as well as by a combined approach. Several isolates, assigned by morphology to different genera (#Leptomonas# spp., #Blastocrithidia# spp.), seem to belong to a single species with an unexpectedly wide host and geographical range. An unnamed trypanosomatid isolated from rats in Egypt was found to belong to the genus #Herpetomonas#, so far associated with insect hosts only. It is closely related to #Herpetomonas ztiplika#, a parasite of a blood-sucking biting midge. Apparently several different trypanosomatid species can infect one insect species, as exemplified by #Leptomonas# sp. PL and #Wallaceina# sp. Wsd, which were isolated from different specimens of #Salda littoralis# on the same locality and day. However, since the same species of #Leptomonas# was obtained from insect hosts belonging to different genera, some insect trypanosomatids may have low host specificity. Our data revealed additional discrepancies between molecular phylogenetic data and cell morphology, rendering current trypanosomatid taxonomy unreliable.
| Main Authors: | , , , , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Published: |
Wiley
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| Subjects: | L60 - Taxonomie et géographie animales, H10 - Ravageurs des plantes, Mastigophora, parasite, Insecta, arn, biodiversité, phylogénie, http://aims.fao.org/aos/agrovoc/c_4643, http://aims.fao.org/aos/agrovoc/c_5574, http://aims.fao.org/aos/agrovoc/c_3890, http://aims.fao.org/aos/agrovoc/c_6618, http://aims.fao.org/aos/agrovoc/c_33949, http://aims.fao.org/aos/agrovoc/c_13325, |
| Online Access: | http://agritrop.cirad.fr/523137/ http://agritrop.cirad.fr/523137/1/523137.pdf |
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| Summary: | We have determined the sequences of 5S rRNA and spliced leader (SL) RNA genes, and adjacent intergenic regions for representatives of all known trypanosomatid genera parasitizing insects. The genetic loci have been analyzed separately as well as by a combined approach. Several isolates, assigned by morphology to different genera (#Leptomonas# spp., #Blastocrithidia# spp.), seem to belong to a single species with an unexpectedly wide host and geographical range. An unnamed trypanosomatid isolated from rats in Egypt was found to belong to the genus #Herpetomonas#, so far associated with insect hosts only. It is closely related to #Herpetomonas ztiplika#, a parasite of a blood-sucking biting midge. Apparently several different trypanosomatid species can infect one insect species, as exemplified by #Leptomonas# sp. PL and #Wallaceina# sp. Wsd, which were isolated from different specimens of #Salda littoralis# on the same locality and day. However, since the same species of #Leptomonas# was obtained from insect hosts belonging to different genera, some insect trypanosomatids may have low host specificity. Our data revealed additional discrepancies between molecular phylogenetic data and cell morphology, rendering current trypanosomatid taxonomy unreliable. |
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