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Memórias do Instituto Oswaldo Cruz

Print version ISSN 0074-0276

Mem. Inst. Oswaldo Cruz vol.89 no.2 Rio de Janeiro Apr./Jun. 1994

http://dx.doi.org/10.1590/S0074-02761994000200021 

Comparative chromatin analysis of Trypanosoma congolenseSchlimmeWolframBurriMarkusBetschartBrunoHeckerHermann Swiss Tropical Institute Basel Switzerland 061994892227231The chromatin of Trypanosoma congolense was analyzed by electron microscopy. The chromatin is organized as nucleosome filaments but does not form a 30 nm fiber. There are five groups of histones, including a histone H1-like protein, which has a molecular weight within the range of the core histones, and is extremely hydrophilic. Weak histone-histone interaction, a typical feature of trypanosoma chromatin, was found. These results are similar to those for T. cruzi and T. b. brucei, but differ significantly from those for higher eukaryotes. The results confirm the model of trypanosome chromatin, and support the theory of their early separation from the other eukaryotes during the evolution. T. congolensis is an excellent model for chromatin research on trypanosomes, because it is easy to cultivate and its chromatin has, a relatively high stability, compared to that of other trypanosomes.Trypanosoma congolensechromatin structurehistoneslower eukaryotesproeyelie culture formsFull text available only in PDF format.Texto completo disponível apenas em PDF.