Comparative analysis of genomic sequences suggests that Trypanosoma cruzi CL Brener contains two sets of non-intercalated repeats of satellite DNA that correspond to T. cruzi I and T. cruzi II types

Comparative analysis of genomic sequences suggests that Trypanosoma cruzi CL Brener contains two sets of non-intercalated repeats of satellite DNA that correspond to T. cruzi I and T. cruzi II types

Author Elias, MCQB Google Scholar
Vargas, N. Google Scholar
Tomazi, L. Google Scholar
Pedroso, A. Google Scholar
Zingales, B. Google Scholar
Schenkman, S. Google Scholar
Briones, MRS Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Abstract Approximately 10% of the Trypanosoma cruzi. genome is formed by a satellite DNA, composed by 195-bp repeats organized in 30 +/- 10 kb clusters in some, but not all chromosomes. Here, the satellite DNA of six representative T. cruzi strains was sequenced and used for phylogenetic inference. the results show that CL Brener contains satellite repeats from T. cruzi I and T. cruzi II strains, although type II sequences are more abundant. the presence of types I and II sequences extends previous propositions that genetic exchange between the two major T. cruzi lineages have occurred in CL Brener, although our data accommodate alternative scenarios of hybridization within T. cruzi II, as proposed by others. Altogether, present data suggest a complex origin for CL Brener. Sequence analysis of satellites isolated from chromosomal bands indicates that satellite DNA sequences are not chromosome specific. Neighbor analysis of in tandem satellite DNAs containing up to five repeats shows that each cluster contains only one type of sequence. Consequently, clusters with intercalated types I and II repeats were not found. We propose that the CL Brener genome contains large pieces of satellite DNA originated mainly from chromosomes of T. cruzi II with introgression of T. cruzi I lineage. (c) 2005 Elsevier B.V. All rights reserved.
Keywords Trypanosoma cruzi
CL Brener
satellite DNA
phylogeny
hybrid genotype
Language English
Date 2005-04-01
Published in Molecular and Biochemical Parasitology. Amsterdam: Elsevier B.V., v. 140, n. 2, p. 221-227, 2005.
ISSN 0166-6851 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 221-227
Origin http://dx.doi.org/10.1016/j.molbiopara.2004.12.016
Access rights Closed access
Type Article
Web of Science ID WOS:000228068600009
URI http://repositorio.unifesp.br/handle/11600/28218

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