Diplomonadida is a lineage of anaerobic protists belonging to Fornicata, Metamonada. Most diplomonads are endobiotic or parasitic, such as Giardia intestinalis, which is a famous human pathogen, but several free-living species exist as well. Although it has been proposed that the free-living diplomonads are descendants of endobiotic organisms and thus interesting from the evolutionary point of view, they have been largely neglected. We obtained 58 cultures of free-living diplomonads belonging to four genera (Hexamita, Trepomonas, Gyromonas, and Trimitus) and six strains of endobiotic diplomonads and analyzed their SSU rRNA gene sequences. We also studied light-microscopic morphology of selected strains and the ultrastructure of Trepomonas rotans for the first time. Our phylogenetic analysis showed that the genus Hexamita, and, possibly, also the genus Trepomonas, are polyphyletic. Trepomonas rotans, which may represent a novel genus, is unique among Diplomonadida by having the cell covered in scales. Our results suggest that the evolution of the endobiotic life style and cell organization in diplomonads is more complicated than previously thought.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ejop.2023.126024 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Expanded gene and taxon sampling of diplomonads shows multiple switches to parasitic and free-living lifestyle.
BMC Biol
September 2024
Institute of Parasitology, Biology Centre, Czech Academy of Sciences, Branišovská, Branišovská 1160/31, 2, České Budějovice, 370 05, Czech Republic.
Article Synopsis
- Diplomonads are a group of anaerobic flagellates that include both host-associated species, like parasites in the intestines, and free-living species found in anoxic environments.
- Research shows that free-living diplomonads are evolutionarily linked to their host-dependent relatives, suggesting that they may have reverted from a parasitic lifestyle back to free-living, which is a rare evolutionary event.
- New phylogenomic analyses reveal multiple branches of free-living diplomonads within host-associated species, highlighting the need for a better understanding of their evolutionary transitions.
Prevalence and assemblage identified of Giardia duodenalis in zoo and farmed Asiatic black bears (Ursus thibetanus) from the Heilongjiang and Fujian Provinces of China.
Parasite
August 2024
School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, PR China.
Article Synopsis
- Giardia duodenalis is found in both captive and free-living wildlife, with a focus on Asiatic black bears, which are significant in China for their economic and medicinal value.
- A study collected 218 feces samples from bears in a zoo and a farm, using techniques like nested PCR to check for the presence and types of G. duodenalis.
- The results showed G. duodenalis in 22 samples, identifying several genetic assemblages, including zoonotic types A and B, indicating possible public health risks related to these bears.
Diversity of gastrointestinal parasites and molecular characterization of Giardia duodenalis in free-living and captive howler monkeys (Alouatta guariba clamitans) in southern Brazil.
Vet Parasitol Reg Stud Reports
July 2024
Graduate Program in Environmental Engineering, Regional University of Blumenau, Blumenau, SC, Brazil; Laboratory of Clinical Parasitology, Federal University of Santa Catarina, Florianópolis, SC, Brazil. Electronic address:
Article Synopsis
- Non-human primates, particularly southern brown howler monkeys in Brazil and Argentina, share a close relationship with humans, making them important for studying infectious agents.
- A study collected and analyzed stool samples from free-living and captive howler monkeys, revealing intestinal parasites like Giardia duodenalis and Cryptosporidium spp. for the first time in this species in the wild.
- The presence of these parasites, especially one that can be transmitted to humans, highlights the impact of human activities and habitat fragmentation on wildlife health and underscores the need for eco-health measures.
Microscopy detection and molecular characterisation of infection in outpatients seeking medical care in Egypt.
Front Public Health
April 2024
Parasitology Reference and Research Laboratory, National Centre for Microbiology, Majadahonda, Spain.
Introduction: Giardiosis remains one of the most prevalent enteric parasitic infections globally. Earlier molecular-based studies conducted in Egypt have primarily focused on paediatric clinical populations and most were based on single genotyping markers. As a result, there is limited information on the frequency and genetic diversity of infections in individuals of all age groups.
View Article and Find Full Text PDFTranscriptome data sets of free-living diplomonads, sp. and sp.
Microbiol Resour Announc
December 2023
Graduate School of Science and Technology, University of Tsukuba, Ibaraki, Japan.
Most species belonging to the diplomonad genera, and , are considered to have secondarily adapted to free-living lifestyles from the parasitic ancestor. Here, we report the annotated transcriptome data of sp. NIES-1444 and sp.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!