Dictionary > Tachyzoite

Tachyzoite

Definition
noun, plural: tachyzoites
A relatively faster-growing, actively multiplying, and invasive cell type of certain Apicomplexans, such as Toxoplasma gondii
Supplement
Apicomplexa is a phylum comprised of protozoans characterized by having a special organelle called an apical complex, and most of them are single-celled, parasitic, and spore-forming. They are intracellular parasites. Their life cycle is comprised of stages where each has a particular cellular variety. Nevertheless, not all members have all the various life stages. Taking for instance the life cycle of Toxoplasma gondii (causative agent of toxoplasmosis), the various cell types in the life cycle of this species includes bradyzoites, tachyzoites, and oocysts. A bradyzoite is a sessile, slow-growing cell type. In latent toxoplasmosis, the bradyzoites form clusters within a cyst (pseudocyst) lodged in muscle and brain tissues of the host. The bradyzoites may give rise to either tachyzoites or gametocytes. The tachyzoites, in comparison with bradyzoites, are relatively faster-growing, actively multiplying, and invasive cell type. Tachyzoites are also motile. They invade cells of almost any cell type. Inside the cell, they multiply until the cell dies and the tachyzoites are released to invade more cells. They divide by endodyogeny and endopolygeny. Certain tachyzoites differentiate into bradyzoites and become tissue cyst mainly in the brain, muscle, and liver tissues of the host.
Word origin: Greek tachys (“fast”) + zōon (“animal”)
See also:


You will also like...

Chromosome Mutations
Chromosome Mutations

Mutations can also influence the phenotype of an organism. This tutorial looks at the effects of chromosomal mutations, ..

Plant Auxins
Plant Auxins – Phototropism & Geotropism

Plants produce hormones to regulate their growth. Auxins, for instance, influence plant growth. Know the role of auxin i..

Early Mammals on Earth
Early Mammals on Earth

The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms..

genes controlling growth and development
Control of Growth & Development

Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..

Electromagnetic spectrum of a brain
Sleep and Dreams – Neurology

While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..

Lake Wakatipu, New Zealand
New Zealand’s Unique Geographical History

Explore why New Zealand has such unique flora and fauna, and learn why long periods of geographical isolation. This less..