Trypanosoma
Parasitic protozoa causing sleeping sickness and Chagas disease.
Trypanosoma is a genus of kinetoplastids (class Trypanosomatidae), a group of unicellular parasitic flagellate protozoa under the phylum Euglenozoa. The name is derived from the Ancient Greek trypano- (borer) and soma (body) because of their corkscrew-like motion. Most trypanosomes are heteroxenous (requiring more than one obligatory host to complete life cycle) and most are transmitted via a vector. They infect a variety of hosts and cause various diseases, including the fatal human diseases sleeping sickness, caused by Trypanosoma brucei, and Chagas disease, caused by Trypanosoma cruzi.
- field
- Parasitology, Protozoology
- known_for
- Causing sleeping sickness and Chagas disease; transmitted by tsetse flies and triatomine bugs
- type
- Genus of parasitic flagellate protozoa
Lore & Background
The genus (T. Many past phylogenetic analyses using the 18S (small subunit) ribosomal RNA (SSU rRNA) sequence have indicated a non-monophyletic Trypanosoma (as 'traditionally defined') with the biflagellate Bodonida nested within. However, analyses using both the combination of the glyceraldehyde phosphate dehydrogenase gene with SSU rRNA, of whole genomes, and of the kinetoplast (mitochondrial) genome indicate that Trypanosoma is, indeed, monophyletic. The division into the Salivaria and the Stercoria remains valid as each can be assigned to a clade in these analyses. The overall evolution of the group follows the general structure of the groups and subgenera. The emergence of a dixenous lifestyle from a monoxenous ancestor has happened at least three times, in Phytomonas, in vertebrate-infecting Trypanosoma, and in vertebrate-infecting Leishmania/Porcisia/Endotrypanum. The common ancestor of the T. cruzi clade appeared about 84 million years ago.
Reader's Guide
Trypanosoma is significant as the causative agent of two major human diseases: African sleeping sickness (Trypanosoma brucei) and Chagas disease (Trypanosoma cruzi), as well as diseases in livestock such as nagana and surra. The genus is divided into two groups based on transmission: Salivaria (African trypanosomes passed via tsetse fly saliva) and Stercoraria (Central/South American trypanosomes passed via triatomine bug feces). Antigenic variation is a characteristic shared by the Salivaria, particularly well-studied in T. brucei. The mitochondrial genome (kinetoplast) is made up of a highly complex series of catenated circles and minicircles. Evidence has been obtained for meiosis in T. cruzi and for genetic exchange; T. brucei undergoes meiosis within the salivary glands of its tsetse fly host. The emergence of parasitism is dated back to the origin of the order Trypanosomatida, which includes both trypanosomes and Leishmania. cruzi clade appeared about 84 million years ago, not long before the diversification of bats.
Did You Know?
- The name Trypanosoma comes from Ancient Greek trypano- (borer) and soma (body) because of their corkscrew-like motion.
- Trypanosoma equiperdum is spread between horses and other equine species by sexual contact.
- The mitochondrial genome of Trypanosoma, known as the kinetoplast, is made up of a highly complex series of catenated circles and minicircles.
- Evidence has been obtained for meiosis in T. cruzi, and T. brucei undergoes meiosis within the salivary glands of its tsetse fly host.
Frequently Asked Questions
What are Trypanosoma's powers or abilities?
As a heteroxenous parasite, each species needs more than one obligatory host to complete its life cycle and typically hops between them via an insect vector such as a tsetse fly or a triatomine bug. Once inside a mammalian host, the organism can invade the bloodstream and tissues, triggering systemic illness.
How does Trypanosoma's story end?
In its most devastating arcs, Trypanosoma brucei drives the host into progressive neurological collapse known as sleeping sickness, while Trypanosoma cruzi causes chronic cardiac and digestive damage in Chagas disease. Without medical intervention, both infections are ultimately fatal to the human host.
Why is Trypanosoma important to the canon?
It stands as one of the most consequential parasitic protozoa in medical history because two of its species cause major fatal human diseases affecting millions across Africa and the Americas. Its biology remains a cornerstone topic in the fields of parasitology and protozoology.
More in Microbial Pathogens 1-20
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record