Cyclic Polyploidy in Obligate Agamic Amoebae
- Authors: Demin S.Y.1, Berdieva M.A.1, Goodkov A.V.1
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Affiliations:
- Institute of Cytology of the Russian Academy of Sciences
- Issue: Vol 13, No 3 (2019)
- Pages: 242-246
- Section: Article
- URL: https://journals.rcsi.science/1990-519X/article/view/212957
- DOI: https://doi.org/10.1134/S1990519X19030027
- ID: 212957
Cite item
Abstract
It is considered that asexual reproduction of organisms should lead to accumulation of harmful mutations in a series of successive generations (the so-called “Muller’s ratchet”). Accordingly, effective mechanisms for “nulling” this effect should exist in the life cycle of obligate agamic protists. According to one hypothesis, a so-called “cyclic polyploidy” (or agamic ploidy cycle) can act as such a mechanism. Lobose amoebae Amoeba proteus and closely related species are obligate agamic organisms. The karyological analysis that we conducted, as well as a detailed study of the cell cycle of A. proteus and A. borokensis using optical tomography, allow us to conclude that these organisms have a special kind of cyclic polyploidy. The euploid state of the nucleus takes a completely insignificant period of time relative to the duration of the entire nuclear cycle of these amoebae, the stages of meta- and telophase of mitosis, whereas the rest time of the cycle is associated with the aneuploid state of the nucleus.
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About the authors
S. Yu. Demin
Institute of Cytology of the Russian Academy of Sciences
Email: pelgood1@gmail.com
Russian Federation, St. Petersburg, 194064
M. A. Berdieva
Institute of Cytology of the Russian Academy of Sciences
Email: pelgood1@gmail.com
Russian Federation, St. Petersburg, 194064
A. V. Goodkov
Institute of Cytology of the Russian Academy of Sciences
Author for correspondence.
Email: pelgood1@gmail.com
Russian Federation, St. Petersburg, 194064