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Updated: Oct 22, 2025
09:45
Ultrastructural Expansion Microscopy in Three In Vitro Life Cycle Stages of Trypanosoma cruzi
Published on: May 12, 2023
1.2K
Maxicircle architecture and evolutionary insights into Trypanosoma cruzi complex
Luisa Berná1,2, Gonzalo Greif1, Sebastián Pita1,3
1Laboratorio de Interacciones Hospedero-Patógeno, Unidad de Biología Molecular, Institut Pasteur de Montevideo, Montevideo, Uruguay.
Plos Neglected Tropical Diseases
|August 26, 2021
Summary
This study reveals Trypanosoma cruzi maxicircles vary in length and architecture, with conserved gene order but deletions impacting NADH dehydrogenase. A new species complex nomenclature is proposed based on maxicircle variants and phylogenetic analysis.
Area of Science:
- Genomics
- Parasitology
- Molecular Biology
Background:
- Trypanosoma cruzi, the causative agent of Chagas disease, exhibits significant genetic diversity.
- Understanding the mitochondrial maxicircle genome is crucial for T. cruzi's evolutionary and functional studies.
Purpose of the Study:
- To characterize the maxicircle genome diversity in T. cruzi strains.
- To investigate the evolutionary relationships and propose a new taxonomic classification for T. cruzi.
Main Methods:
- Long-read sequencing of T. cruzi maxicircles.
- Comparative genomic analysis of coding regions and nuclear genes.
- Phylogenetic analysis of 29 strains and 1108 single-copy nuclear genes.
Main Results:
- Maxicircle lengths range from 35-50 kb with conserved architecture (CR, AT-rich, SR, LR regions).
- Deletions in NADH dehydrogenase genes suggest Complex I is non-functional.
- Phylogenetic analysis supports T. cruzi as a species complex with three maxicircle variants (a, b, c) linked to specific clades.
Conclusions:
- A revised species complex classification for T. cruzi is proposed based on maxicircle variants and phylogenetic data.
- The study clarifies the evolutionary history and genetic makeup of T. cruzi populations.
- The findings provide a foundation for future research into T. cruzi biology and control.
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