When they discovered a new parasite in water fleas a couple of years ago, they classified this undescribed species as a microsporidium, mostly because it possessed the unique harpoon - like infection apparatus (the polar - tube), one of the hallmarks
of microsporidia.
With the help of scientists in Sweden and the U.S., the Basel researchers rewrote the evolutionary history
of microsporidia.
Not exact matches
... The list
of diseases found with extraordinary frequency among male homosexual practitioners as a result
of anal intercourse is alarming: anal cancer, chlamydia trachomatis, cryptosporidium, giardia lamblia, herpes simplex virus, human immunodeficiency virus, human papilloma virus, isospora belli,
microsporidia, gonorrhea, viral hepatitis type B & C, syphilis.
The analysis
of the entire genome had several surprises in store for them: The genome resembles more that
of a fungi than a
microsporidium and, in addition, also has a mitochondrial genome.
Electronmicroscopic picture
of the spores
of the newly discovered
microsporidium M. daphniae.
The research group lead by Prof. Dieter Ebert from the Department
of Environmental Science at the University
of Basel has now discovered the missing link that explains how this large group
of extreme parasites, the
microsporidia, has evolved.
«Our results are not only a milestone for the research on
microsporidia, but they are also
of great interest to the study
of parasite - specific adaptations in evolution in general,» explains Ebert the findings.
Nematocida parisii, a newly discovered species
of the protozoan parasites known as
microsporidia, lives in the intestines
of C. elegans, a small roundworm commonly used for research.
After recognizing
microsporidia as members
of the fungal kingdom with all its elaborate metabolic tricks and lifestyles, biologists could see that
microsporidia had been more complex at one time, but eventually lost fancy traits.
Examining a handful
of genes, Keeling and other researchers demonstrated that the single - gene tree had put
microsporidia in the wrong kingdom.