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Apicomplexan life cycle

Apicomplexans, a group of intracellular parasites, have life cycle stages that allow them to survive the wide variety of environments they are exposed to during their complex life cycle. Each stage in the life cycle of an apicomplexan organism is typified by a cellular variety with a distinct morphology and biochemistry.

Methods of asexual replication
Apicomplexans (sporozoans) replicate via ways of multiple fission (also known as schizogony). These ways include ', and ', although the latter is sometimes referred to as schizogony, despite its general meaning. Merogony is an asexually reproductive process of apicomplexa. After infecting a host cell, a trophozoite (see glossary below) increases in size while repeatedly replicating its nucleus and other organelles. During this process, the organism is known as a ' or '. Cytokinesis next subdivides the multinucleated schizont into numerous identical daughter cells called merozoites (see glossary below), which are released into the blood when the host cell ruptures. Organisms whose life cycles rely on this process include Theileria, Babesia, Plasmodium, and Toxoplasma gondii. Sporogony is a type of sexual and asexual reproduction. It involves karyogamy, the formation of a zygote, which is followed by meiosis and multiple fission. This results in the production of sporozoites. Other forms of replication include ' and '. Endodyogeny is a process of asexual reproduction, favoured by parasites such as Toxoplasma gondii. It involves an unusual process in which two daughter cells are produced inside a mother cell, which is then consumed by the offspring prior to their separation. Endopolygeny is the division into several organisms at once by internal budding. ==Glossary of cell types==
Glossary of cell types
'' '', transmission electron microscopy File:Babesia life cycle human en.svg|Life cycle of the Babesia parasite File:Eimeria life cycle usda.jpg|Life cycle of the Eimeria parasite File:Toxoplasmosis life cycle en.svg|Life cycle of the Toxoplasma parasite ==Genome size==
Genome size
The dynamics of gene loss was studied in 41 apicomplexan genomes. Loss of genes employed in amino acid metabolism and steroid biosynthesis could be explained by metabolic redundancy with the host. Also, DNA repair genes tend to be lost by apicomplexans with reduced proteome size, probably reflecting a reduced need for DNA repair of genomes with smaller information content. Reduced DNA repair may help explain the elevated mutation rates in pathogens with reduced genome size. ==See also==
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