Toxoplasma gondii

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Toxoplasma gondii
Scientific classification

Description and significance

Toxoplasma gondii is a single celled organism that is known for being the cause of Toxoplasmosis, a common food born illness.

Structure

Cell Structure

T. gondii is a unicellular protist with an amorphous amoeboid-like body form. They have no flagella or other motility structures but move by amoeboid motion. The plasma membrane is surrounded by a cell wall. Although they do not have a contractile vesicle they have alveoli just below their plasma membrane. These alveoli are subcellular cavities characteristic of many protists that are important for stabilization of the cellular surface. The apical end of their spores contains a mass of organelles that help the spores invade their host tissue.

ultrastructure Toxoplasma gondii

Genome structure

The complete circular T. gondii genome was sequenced by The University of Pennsylvania in 2006 using the Random Shot-gun method. The size of the genome is reported to be 34,996nt long. Of the entire genome, fifty two percent codes for proteins. Of the 63 genes present, 37 encode structural RNAs and 26 code for other proteins. The GC content of the genome is reported as twenty-one percent.

Use the following link to view the complete genome of T. gondii according to gene location. [1]

Pathology