Please use this identifier to cite or link to this item: https://www.arca.fiocruz.br/handle/icict/7922
Title: Genome Size, Karyotype Polymorphism and Chromosomal Evolution in Trypanosoma cruzi
Authors: Souza, Renata Torres de,
Lima, Fabio Mitsuo
Barros, Roberto Rudge de Moraes
Cortez, Danielle Rodrigues
Santos, Michele F.
Veas, Esteban Mauricio Cordero
Ruiz, Jerônimo Conceição
Goldenberg, Samuel
Teixeira, Marta Maria Geraldes
Silveira, José Franco da
Affilliation: Universidade Federal de São Paulo. Escola Paulista de Medicina. Departamento de Microbiologia, Imunologia e Parasitologia. São Paulo, SP, Brazil
Universidade Federal de São Paulo. Escola Paulista de Medicina. Departamento de Microbiologia, Imunologia e Parasitologia. São Paulo, SP, Brazil
Universidade Federal de São Paulo. Escola Paulista de Medicina. Departamento de Microbiologia, Imunologia e Parasitologia. São Paulo, SP, Brazil
Universidade Federal de São Paulo. Escola Paulista de Medicina. Departamento de Microbiologia, Imunologia e Parasitologia. São Paulo, SP, Brazil
Universidade Federal de São Paulo. Escola Paulista de Medicina. Departamento de Microbiologia, Imunologia e Parasitologia. São Paulo, SP, Brazil
Universidade Federal de São Paulo. Escola Paulista de Medicina. Departamento de Microbiologia, Imunologia e Parasitologia. São Paulo, SP, Brazil
Fundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, Brazil
Instituto Carlos Chagas. Paraná, Brazil
Universidade de São Paulo. Instituto de Ciências Biomédicas. Departamento de Parasitologia. São Paulo, SP, Brazil
Universidade Federal de São Paulo. Escola Paulista de Medicina. Departamento de Microbiologia, Imunologia e Parasitologia. São Paulo, SP, Brazil
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 (José-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.
Keywords: Trypanosoma cruzi
Issue Date: 2011
Publisher: Public Library of Science
Citation: SOUZA, Renata Torres de et al. Genome Size, Karyotype Polymorphism and Chromosomal Evolution in Trypanosoma cruzi. PLoS One, 6(8): e23042, 2011.
DOI: 10.1371/journal.pone.0023042
ISSN: 1932-6203
Copyright: open access
Appears in Collections:PR - ICC - Artigos de Periódicos
MG - IRR - Artigos de Periódicos

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