Kinetoplastid facts for kids
Quick facts for kids Kinetoplastida |
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| Trypanosoma cruzi parasites | |
Scientific classification  |
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| Domain: | Eukaryota |
| Phylum: | Euglenozoa |
| Subphylum: | Glycomonada |
| Class: | Kinetoplastea Honigberg, 1963 emend. Cavalier-Smith, 1981 |
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Kinetoplastida are a fascinating group of tiny, single-celled organisms called protists. They are part of a larger group called Euglenozoa. What makes them special is a unique part inside their cell called a kinetoplast. This kinetoplast is like a tiny granule packed with a lot of DNA.
Some kinetoplastids live freely in soil and water, often eating bacteria. Others are parasites. This means they live inside other living things, like humans or animals. These parasitic forms can cause various illnesses. Scientists often call these organisms "kinetoplastids."
One common type is Bodo, which usually lives freely. Other important types include Cryptobia and the parasitic Leishmania.
Contents
Understanding Kinetoplastids
How Scientists Classify Kinetoplastids
Scientists like Bronislaw M. Honigberg first described kinetoplastids in 1963. Since then, they have been classified in different ways. Sometimes they are called a "class" (Kinetoplastea), and sometimes an "order" (Kinetoplastida). This shows how scientists continue to learn and refine how they group living things.
Kinetoplastids are divided into two main groups, or subclasses: Metakinetoplastina and Prokinetoplastina. Within these groups, there are many different families and orders. For example, the Bodonida group includes many free-living species. The Trypanosomatida group is known for its many parasitic members.
What Kinetoplastids Look Like Inside
Kinetoplastids are eukaryotic cells. This means they have a nucleus and other common cell parts, like mitochondrion (which make energy) and a golgi apparatus (which processes proteins). But they also have some special features.
The Kinetoplast: A DNA Powerhouse
The kinetoplast is the most unique part of these organisms. It's a dense granule of DNA found inside their single mitochondrion. Think of it as a mini-library of genetic information for the mitochondrion. This structure is located near the base of the cell's "tail," or flagellum.
The Cell's Skeleton and Tails
Kinetoplastids have an internal "skeleton" called a cytoskeleton. This is mostly made of tiny tubes called microtubules. These microtubules help the cell keep its shape and move.
All kinetoplastids have at least one flagellum. A flagellum is like a whip-like tail that helps the organism swim around or attach to surfaces. Some kinetoplastids have one flagellum, while others have two. If they have two, one might lead the way and the other might trail behind, sometimes attached to the side of the cell.
- Flagellum
- Flagellar membrane
- Flagellar axoneme
- Paraflagellar rod
- Flagellar attachment zone
- Flagellar-associated ER
- Pelicular microtubules
- Endosome, sorts material
- Glycosome
- Acidocalcisome
- Mitochondrion, creates ATP (energy) for the cell (discoid cristae)
- Nucleus
- Golgi apparatus, modifies proteins and sends them out of the cell
- Flagellar pocket collar
- Flagellar pocket
- Basal bodies
- Connecting fibres
- Kinetoplast, DNA-containing granule
- Antipodal site
Life Cycle and Reproduction
Kinetoplastids can live in different ways. Some are free-living, meaning they exist independently in the environment. Others are parasitic, living inside a host organism.
The group called trypanosomatids is entirely made up of parasites. These parasites can have simple life cycles with just one host. Or they can have complex life cycles, changing forms as they move between two different hosts.
Some well-known illnesses caused by these parasites include sleeping sickness and Chagas disease. These are caused by different types of Trypanosoma. Another illness, leishmaniasis, is caused by species of Leishmania.
Kinetoplastids can reproduce in various ways. For example, Trypanosoma brucei and Leishmania major can undergo a process similar to meiosis. This is a type of cell division that is part of a sexual reproduction cycle.
Gallery
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Cryptobia sp.
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Bodo sp.
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Trypanosoma sp.
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See also
In Spanish: Kinetoplastea para niños
