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Vol. 140, No. 2-4, 2013
Issue release date: July 2013
Section title: Meiosis and Its Deviations in Polyploids
Cytogenet Genome Res 2013;140:185-203
(DOI:10.1159/000351731)

Meiosis and Its Deviations in Polyploid Animals

Stenberg P. · Saura A.
aDepartment of Molecular Biology, and bComputational Life Sciences Cluster (CLiC), Umeå University, Umeå, Sweden

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Article / Publication Details

First-Page Preview
Abstract of Meiosis and Its Deviations in Polyploids

Published online: 6/18/2013

Number of Print Pages: 19
Number of Figures: 7
Number of Tables: 0

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR

Abstract

We review the different modes of meiosis and its deviations encountered in polyploid animals. Bisexual reproduction involving normal meiosis occurs in some allopolyploid frogs with variable degrees of polyploidy. Aberrant modes of bisexual reproduction include gynogenesis, where a sperm stimulates the egg to develop. The sperm may enter the egg but there is no fertilization and syngamy. In hybridogenesis, a genome is eliminated to produce haploid or diploid eggs or sperm. Ploidy can be elevated by fertilization with a haploid sperm in meiotic hybridogenesis, which elevates the ploidy of hybrid offspring such that they produce diploid gametes. Polyploids are then produced in the next generation. In kleptogenesis, females acquire full or partial genomes from their partners. In pre-equalizing hybrid meiosis, one genome is transmitted in the Mendelian fashion, while the other is transmitted clonally. Parthenogenetic animals have a very wide range of mechanisms for restoring or maintaining the mother's ploidy level, including gamete duplication, terminal fusion, central fusion, fusion of the first polar nucleus with the product of the first division, and premeiotic duplication followed by a normal meiosis. In apomictic parthenogenesis, meiosis is replaced by what is effectively mitotic cell division. The above modes have different evolutionary consequences, which are discussed. See also the sister article by Grandont et al. in this themed issue.


  

Author Contacts

Anssi Saura
Department of Molecular Biology
Umeå University
SE-901 87 Umeå (Sweden)
E-Mail Anssi.Saura@molbiol.umu.se

  

Article Information

Published online: June 18, 2013
Number of Print Pages : 19
Number of Figures : 7, Number of Tables : 0, Number of References : 152

  

Publication Details

Cytogenetic and Genome Research

Vol. 140, No. 2-4, Year 2013 (Cover Date: July 2013)

Journal Editor: Schmid M. (Würzburg)
ISSN: 1424-8581 (Print), eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR


Article / Publication Details

First-Page Preview
Abstract of Meiosis and Its Deviations in Polyploids

Published online: 6/18/2013

Number of Print Pages: 19
Number of Figures: 7
Number of Tables: 0

ISSN: 1424-8581 (Print)
eISSN: 1424-859X (Online)

For additional information: http://www.karger.com/CGR


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