Please use this identifier to cite or link to this item: https://repositorio.unifesp.br/handle/11600/33954
Title: Genome Size, Karyotype Polymorphism and Chromosomal Evolution in Trypanosoma cruzi
Authors: Souza, Renata T. [UNIFESP]
Lima, Fabio M. [UNIFESP]
Barros, Roberto Moraes [UNIFESP]
Cortez, Danielle R. [UNIFESP]
Santos, Michele F. [UNIFESP]
Cordero, Esteban M. [UNIFESP]
Ruiz, Jeronimo Conceicao
Goldenberg, Samuel
Teixeira, Marta M. G.
Silveira, José Franco da [UNIFESP]
Universidade Federal de São Paulo (UNIFESP)
Ctr Pesquisas Rene Rachou Fiocruz
Inst Carlos Chagas
Universidade de São Paulo (USP)
Issue Date: 12-Aug-2011
Publisher: Public Library Science
Citation: Plos One. San Francisco: Public Library Science, v. 6, n. 8, 14 p., 2011.
Abstract: Background: the Trypanosoma cruzi genome was sequenced from a hybrid strain (CL Brener). However, high allelic variation and the repetitive nature of the genome have prevented the complete linear sequence of chromosomes being determined. Determining the full complement of chromosomes and establishing syntenic groups will be important in defining the structure of T. cruzi chromosomes. A large amount of information is now available for T. cruzi and Trypanosoma brucei, providing the opportunity to compare and describe the overall patterns of chromosomal evolution in these parasites.Methodology/Principal Findings: the genome sizes, repetitive DNA contents, and the numbers and sizes of chromosomes of nine strains of T. cruzi from four lineages (TcI, TcII, TcV and TcVI) were determined. the genome of the TcI group was statistically smaller than other lineages, with the exception of the TcI isolate Tc1161 (Jose-IMT). Satellite DNA content was correlated with genome size for all isolates, but this was not accompanied by simultaneous amplification of retrotransposons. Regardless of chromosomal polymorphism, large syntenic groups are conserved among T. cruzi lineages. Duplicated chromosome-sized regions were identified and could be retained as paralogous loci, increasing the dosage of several genes. By comparing T. cruzi and T. brucei chromosomes, homologous chromosomal regions in T. brucei were identified. Chromosomes Tb9 and Tb11 of T. brucei share regions of syntenic homology with three and six T. cruzi chromosomal bands, respectively.Conclusions: Despite genome size variation and karyotype polymorphism, T. cruzi lineages exhibit conservation of chromosome structure. Several syntenic groups are conserved among all isolates analyzed in this study. the syntenic regions are larger than expected if rearrangements occur randomly, suggesting that they are conserved owing to positive selection. Mapping of the syntenic regions on T. cruzi chromosomal bands provides evidence for the occurrence of fusion and split events involving T. brucei and T. cruzi chromosomes.
URI: http://repositorio.unifesp.br/handle/11600/33954
ISSN: 1932-6203
Other Identifiers: http://dx.doi.org/10.1371/journal.pone.0023042
Appears in Collections:Em verificação - Geral

Files in This Item:
File Description SizeFormat 
WOS000293953500015.pdf646.6 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.