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Amitosis, also known as karyostenotic, direct cell division, or binary fission, represents a mode of asexual cell division predominantly observed in prokaryotes. This process is distinct from other cell division mechanisms such as mitosis and meiosis, primarily because it bypasses the complexities associated with the mitotic apparatus, such as spindle formation. Additionally, amitosis does not involve the condensation of chromatin into distinct chromosomes before the division of the cell occurs, simplifying the process of cellular replication.
Several instances of cell division formerly thought to be "non-mitotic", such as the division of some unicellular eukaryotes, may actually occur by the process of "closed mitosis", which is different from open or semi-closed mitotic processes, all of which involve mitotic chromosomes and are classified by nuclear envelope. Amitosis can also effect on the distribution of human lactic acid dehydrogenase isoenzyme which is present in almost all body tissue. Example of amitosis is spermatogenesis. When in the process of amitosis the cell membrane will not divide.
There are two or more nuclei which are called dinucleated and multinucleated cells respectively. Sometimes it is also formed by fusion of the cell. Amitosis differs fundamentally from mitosis without cytokinesis, yet still shares some similarities between amitosis and cell fusion. Amitosis can result in near haploid nuclei, which is not possible through mitosis or cell fusion.[1]
The mitotic index declines from 2.2% at day ten to 0.3% at day thirty during postnatal life. Delayed fixation yields degenerated prophase and telophase nuclei only. [2]
^Kuhn, E. M.; Therman, E.; Susman, B. (1991). "Amitosis and endocycles in early cultured mouse trophoblast". Placenta. 12 (3): 251–261. doi:10.1016/0143-4004(91)90006-2. PMID 1754574.
^Pfitzer, P. (1980). "Amitosis: A Historical Misinterpretation?". Pathology, Research and Practice. 167 (2–4): 292–300. doi:10.1016/S0344-0338(80)80059-8. PMID 7433237.
present in almost all body tissue. Example of amitosis is spermatogenesis. When in the process of amitosis the cell membrane will not divide. There are...
every time the cell divides. Macronuclear division is accomplished by amitosis, and the segregation of the chromosomes occurs by a process whose mechanism...
mitosis (equational division). A primitive form of cell division, called amitosis, also exists. The amitotic or mitotic cell divisions are more atypical...
binary fission. During reproduction, the macronucleus splits by a type of amitosis, and the micronuclei undergo mitosis. The cell then divides transversally...
increase of numbers). During fission, the macronucleus splits by a type of amitosis, and the micronuclei undergo mitosis. The cell then divides transversally...
Platelet-producing megakaryocytes go through endomitosis during cell differentiation. Amitosis in ciliates and in animal placental tissues results in a random distribution...
Microgametocytes become very active, and their nuclei undergo fission (i.e. amitosis) to each give 6-8 daughter nuclei, which becomes arranged at the periphery...
during nuclear division. These include meiosis in micronucleus cells, amitosis in micronucleus cells, and mitosis in micronucleus cells. Micronucleus...
Taylor & Sunny Murray, 2012, FMP Galore, Bing, 2004 Adventure Reality, Amitosis, 2002 The Vermilion, Chris Jonas' The Sun Spits Cherries featuring Myra...
reproduction to form new daughter macronuclei, through a process called amitosis. However, in karyorelicteans, the macronuclei are unable to divide. Instead...
mitosis during asexual division while the somatic nucleus undergoes amitosis. Amitosis is a stochastic process where unlike in mitosis, there is no spindle...
the relationship of the nuclear forms described by Arnold to mitosis and amitosis), was an in-depth study of cell division. Upon graduation, Reinke completed...
Saratov State University in Russia; researched in the field of mitosis and amitosis, which laid the foundation for cloning; born in Ruma and lived in Novi...
16(2): 262-280. Tippit D. H. and J. D. Pickett-Heaps. (1976), Apparent amitosis in the binucleate dinoflagellate Peridinium balticum. Journal of Cell Science...
chromosome individualization and segregation during mitosis, meiosis, and amitosis in Tetrahymena thermophila". Mol. Biol. Cell. 29 (4): 466–478. doi:10.1091/mbc...
the DNA necessary for vegetative growth. The macronucleus divides via amitosis, whereas the micronucleus undergoes typical mitosis. During sexual development...
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