Crithidia luciliae

Crithidia luciliae
Crithidia luciliae. Kinetoplast and nucleus are stained green
"Immunofluorescence staining pattern of anti-dsDNA antibodies on C. luciliae substrate. The kinetoplast located near the flagellum is stained, indicating the presence of anti-dsDNA antibodies in a person with systemic lupus erythamatosus.
Scientific classification
Domain:	Eukaryota
(unranked):	Euglenozoa
Order:	Kinetoplastida
Family:	Trypanosomatidae
Genus:	Crithidia
Species:	C. luciliae
Binomial name
Crithidia luciliae

Crithidia luciliae is a flagellate parasitic protist known to use the housefly Musca domestica as a host. As part of the family of Trypanosomatidae, they are characterised by the presence of a kinetoplast; a complex network of interlocking circular dsDNA molecules. The presence of this kinetoplast means they are important in the diagnosis of systemic lupus erythamatosus (SLE). By using C.luciliae as a substrate for immunofluorescence, the organelle can be used to detect anti-dsDNA antibodies, a common feature of the disease.

Taxonomy

C.luciliae is a eukaryotic single-cell protozoan. The family Trypanosomatidae belongs to the order kinetoplastida and is characterised by the presence of the kinetoplast, a network of interlocking circular DNA in a large mitochondrion. All organisms in Kinetoplastida are parasitic, and the host organism for C.luciliae is the housefly Musca domestica.

Role in systemic lupus erythematosus diagnosis

The kinetoplast found in C.luciliae allows them to be used for the detection of anti-dsDNA antibodies, a type of anti-nuclear antibody. Anti-nuclear antibodies are a common feature in SLE and anti-dsDNA antibodies are highly specific for the disease. The high concentration of dsDNA and the absence of human nuclear antigens in the kinetoplast provides a specific substrate for the detection of anti-dsDNA antibodies.

Purine nucleotide and nucleobase uptake

As a parasitic protazoan, C.luciliae lacks the ability to biosynthetically produce purine bases and therefore needs to salvage them from the surrounding environment. Three transport systems are used for the uptake of bases from the host organism. One for the uptake of adenosine and its analogues, one for guanosine, its analogues and inosine and one for hypoxanthine, adenine and adenosine.