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

被引:37
作者
Elias, MCQB
Vargas, N
Tomazi, L
Pedroso, A
Zingales, B
Schenkman, S
Briones, MRS
机构
[1] Univ Fed Sao Paulo, Dept Microbiol Immunol & Parasitol, BR-04023062 Sao Paulo, Brazil
[2] Univ Sao Paulo, Inst Quim, Dept Bioquim, Sao Paulo, Brazil
基金
巴西圣保罗研究基金会;
关键词
Trypanosoma cruzi; CL Brener; satellite DNA; phylogeny; hybrid genotype;
D O I
10.1016/j.molbiopara.2004.12.016
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
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.
引用
收藏
页码:221 / 227
页数:7
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