首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Phylogenetic relationships of trypanosomatids parasitising true bugs (Insecta: Heteroptera) in sub-Saharan Africa
Authors:Votýpka Jan  Klepetková Helena  Jirk? Milan  Kment Petr  Luke? Julius
Institution:1. Biology Centre, Institute of Parasitology, Czech Academy of Sciences, Brani?ovská 31, 370 05 ?eské Budějovice (Budweis), Czech Republic;2. Department of Parasitology, Faculty of Science, Charles University in Prague, Vini?ná 7, 128 44 Prague, Czech Republic;3. Faculty of Sciences, University of South Bohemia, Brani?ovská 31, 370 05 ?eské Budějovice (Budweis), Czech Republic;4. Department of Entomology, National Museum, Gol?ova 1, 148 00 Prague 4 – Kunratice, Czech Republic
Abstract:Three hundred and eighty-six heteropteran specimens belonging to more than 90 species captured in Ghana, Kenya and Ethiopia were examined for the presence of trypanosomatid flagellates. Of those, 100 (26%) specimens were positive for trypanosomatids and the spliced leader RNA gene sequence was obtained from 81 (80%) of the infected bugs. Its sequence-based analysis placed all examined flagellates in 28 typing units. Among 19 newly described typing units, 16 are restricted to sub-Saharan Africa, three belong to previously described species and six to typing units found on other continents. This result was corroborated by the analysis of the ssrRNA gene, sequenced for at least one representative of each major spliced leader RNA-based clade. In all trees obtained, flagellates originating from sub-Saharan Africa were intermingled with those isolated from American, Asian and European hosts, revealing a lack of geographic correlation. They are dispersed throughout most of the known diversity of monoxenous trypanosomatids. However, a complex picture emerged when co-evolution with their heteropteran hosts was taken into account, since some clades are specific for a single host clade, family or even species, whereas other flagellates display a very low host specificity, with a capacity to parasitise heteropteran bugs belonging to different genera/families. The family Reduviidae contains the widest spectrum of trypanosomatids, most likely a consequence of their predatory feeding behaviour, leading to an accumulation of a variety of flagellates from their prey. The plant pathogenic genus Phytomonas is reported here from Africa, to our knowledge for the first time. Finding the same typing units in hosts belonging to different heteropteran families and coming from different continents strongly indicates that the global diversity of the insect trypanosomatids is most likely lower than was predicted on the basis of the "one host-one parasite" paradigm. The analysis presented significantly extends the known diversity of monoxenous insect trypanosomatids and will be instrumental in building a new taxonomy that reflects their true phylogenetic relationships.
Keywords:
本文献已被 ScienceDirect PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号