Aneuploidy Occurrence in Oligochaeta
Ecology and Evolutionary Biology
Volume 1, Issue 3, December 2016, Pages: 57-63
Received: Aug. 2, 2016; Accepted: Nov. 8, 2016; Published: Dec. 2, 2016
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Authors
Tomáš Pavlíček, Institute of Evolution, University of Haifa, Haifa, Israel
Tova Cohen, Institute of Evolution, University of Haifa, Haifa, Israel
Shweta Yadav, School of Biological Sciences, Dr. H S Gour Central University, Sagar, India
Michèle Glasstetter, Department of Environmental Sciences, Biogeography, University of Basel, Basel, Switzerland
Petr Král, Departments of Chemistry, Physics and Biopharmaceutical Sciences, the University of Illinois at Chicago, Chicago, USA
Oren Pearlson, Institute of Evolution, University of Haifa, Haifa, Israel; School of Science and Technology, Tel Hai Academic College, Upper Galilee, Israel
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Abstract
Appearance of aneuploidy in the germ and somatic lines is usually associated with chromosome and genome rearrangements leading to polysomies and cancer. However, aneuploidy plays an important role in chromosome evolution and in the regulation of the ontogenetic development and phenotypic expression. The latter is known as chromosome diminutions. In Oligochaeta (mainly family Naididae but also Lumbricidae, Erpobdellidae and Branchiobdellidae), we have equated the variability of the chromosome count numbers with aneuploidy based on the results of our analyses and identified chromosome-like nondisjunctions as a major mechanism responsible for it. Another author detected Robertsonian-like translocations producing aneuploidy in Eisenia fetida (Lumbricidae, Oligochaeta). Our observations, nevertheless, show that, among karyotyped haploid/diploid cells, the most frequent were haploid (1n) or diploid (2n) chromosome counts connected by multiples. The number of aneuploidy counts was decreasing with the increase of x in expressions 1n + x/1n – x or 2n + x/2n – x. Noteworthy is that not all frequencies of chromosomes in a pair have the same probability. For example, odd aneuploidy numbers of chromosomes are significantly less frequent than the even ones. The wide spread of aneuploidy among Oligochaeta supports the punctuated equilibria model of evolution.
Keywords
Oligochaeta, Earthworm, Aneuploidy, Evolution, Macroevolution, Microevolution
To cite this article
Tomáš Pavlíček, Tova Cohen, Shweta Yadav, Michèle Glasstetter, Petr Král, Oren Pearlson, Aneuploidy Occurrence in Oligochaeta, Ecology and Evolutionary Biology. Vol. 1, No. 3, 2016, pp. 57-63. doi: 10.11648/j.eeb.20160103.13
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Copyright © 2016 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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