Title
Genomic rearrangements in trypanosomatids : an alternative to the "one gene" evolutionary hypotheses? Genomic rearrangements in trypanosomatids : an alternative to the "one gene" evolutionary hypotheses?
Author
Faculty/Department
Faculty of Pharmaceutical, Biomedical and Veterinary Sciences . Biomedical Sciences
Publication type
article
Publication
Rio de Janeiro ,
Subject
Human medicine
Source (journal)
Memorias do Instituto Oswaldo Cruz. - Rio de Janeiro
Volume/pages
95(2000) :4 , p. 527-534
ISSN
0074-0276
ISI
000088132200015
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Most molecular trees of trypanosomatids are based on point mutations within DNA sequences. In contrast, there are very few evolutionary studies considering DNA (re) arrangement as genetic characters. Waiting for the completion of the various parasite genome projects, first information may already be obtained from chromosome size-polymorphism, using the appropriate algorithms for data processing. Three illustrative models are presented here. First, the case of Leishmania (Viannia) braziliensis/L. (V.) peruviana is described. Thanks to a fast evolution rate (due essentially to amplification/deletion of tandemly repeated genes), molecular karyotyping seems particularly appropriate for studying recent evolutionary divergence, including eco-geographical diversification. Secondly, karyotype evolution is considered at the level of whole genus Leishmania. Despite the fast chromosome evolution rate, there is qualitative congruence with MLEE- and RAPD-based evolutionary hypotheses. Significant differences may be observed between major lineages, likely corresponding to major and less frequent rearrangements (fusion/fission, translocation). Thirdly, comparison is made with Trypanosoma cruzi. Again congruence is observed with other hypotheses and major lineages are delineated by significant chromosome rearrangements. The level of karyotype polymorphism within that "species" is similar to the one observed in "genus" Leishmania. The relativity of the species concept among these two groups of parasites is discussed.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/922304/c81cabe4.pdf
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