## Kinetoplast Structure **Key Point:** The kinetoplast is a specialized mitochondrial structure containing a large mass of DNA, located at the base of the flagellum in trypanosomatid protozoa. ### Trypanosoma brucei Morphology Trypanosoma brucei is a hemoflagellate that displays: - A single flagellum arising from the kinetoplast - The kinetoplast appears as a dark-staining dot on Romanowsky-stained smears - The flagellum runs along the body length, forming an undulating membrane - Size: 15–30 μm in length **High-Yield:** The kinetoplast is pathognomonic for trypanosomatids and is the key identifying feature on peripheral blood smear. ### Comparison with Other Blood Parasites | Parasite | Kinetoplast | Flagellum | Smear Appearance | |----------|-------------|-----------|------------------| | Trypanosoma brucei | Present (visible) | Single, with undulating membrane | Elongated, motile | | Plasmodium spp. | Absent | Absent | Ring forms, trophozoites, gametocytes | | Wuchereria bancrofti | Absent | Absent | Microfilariae (sheathed) | | Entamoeba histolytica | Absent | Absent | Trophozoites with pseudopodia | **Clinical Pearl:** In sleeping sickness caused by T. brucei, the kinetoplast is visible on wet mount preparations and stained smears, making rapid field diagnosis possible in endemic areas. **Mnemonic:** **KINO** = **K**inetoplast **I**n **N**ew w**O**rld and African trypanosomes — helps recall that kinetoplast is specific to Trypanosoma species.
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