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Sci Rep. 2019 Jan 17;9(1):192. doi: 10.1038/s41598-018-36718-0.

Overexpression of Trypanosoma cruzi High Mobility Group B protein (TcHMGB) alters the nuclear structure, impairs cytokinesis and reduces the parasite infectivity.

Author information

1
Instituto de Biología Molecular y Celular de Rosario (IBR), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Rosario, Argentina.
2
Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Laboratorio de Ultraestrutura Celular Hertha Meyer, Rio de Janeiro, Brazil.
3
Laboratório Especial de Ciclo Celular, Instituto Butantan, São Paulo, SP, 05503-900, Brazil.
4
Center of Toxins, Immune Response and Cell Signaling - CeTICS, Instituto Butantan, São Paulo, SP, 05503-900, Brazil.
5
Universidad Nacional de Rosario (UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Cátedra de Parasitología, Rosario, Argentina.
6
Instituto de Biología Molecular y Celular de Rosario (IBR), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Rosario, Argentina. cribb@ibr-conicet.gov.ar.
7
Universidad Nacional de Rosario (UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Cátedra de Parasitología, Rosario, Argentina. cribb@ibr-conicet.gov.ar.

Abstract

Kinetoplastid parasites, included Trypanosoma cruzi, the causal agent of Chagas disease, present a unique genome organization and gene expression. Although they control gene expression mainly post-transcriptionally, chromatin accessibility plays a fundamental role in transcription initiation control. We have previously shown that High Mobility Group B protein from Trypanosoma cruzi (TcHMGB) can bind DNA in vitro. Here, we show that TcHMGB also acts as an architectural protein in vivo, since the overexpression of this protein induces changes in the nuclear structure, mainly the reduction of the nucleolus and a decrease in the heterochromatin:euchromatin ratio. Epimastigote replication rate was markedly reduced presumably due to a delayed cell cycle progression with accumulation of parasites in G2/M phase and impaired cytokinesis. Some functions involved in pathogenesis were also altered in TcHMGB-overexpressing parasites, like the decreased efficiency of trypomastigotes to infect cells in vitro, the reduction of intracellular amastigotes replication and the number of released trypomastigotes. Taken together, our results suggest that the TcHMGB protein is a pleiotropic player that controls cell phenotype and it is involved in key cellular processes.

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