Premeiotic endomitosis produces diploid eggs in the natural clone loach, Misgurnus anguillicaudatus (Teleostei: Cobitidae)

Journal of Experimental Zoology. Part A, Comparative Experimental Biology
Masaki ItonoKatsutoshi Arai

Abstract

The natural clone loach produces unreduced eggs genetically identical to somatic cells of the mother fish and such diploid eggs normally develop as a clone without genetic contribution of sperm. Following the identification of clonal nature and diploidy of eggs, we conducted cytological studies to determine the mechanisms responsible for this unusual oogenesis. Cytolological observation of full-grown oocytes cultured in vitro revealed that oocytes of both the clone and the control loach underwent two successive meiotic divisions: formation of a bipolar spindle and metaphase in meiosis I and equal segregation of chromosomes, extrusion of the first polar body and the appearance of metaphase of meiosis II. However, spindle size of the clone was larger than that of the control. Bivalent chromosome number of germinal vesicle of oocytes was 25 in the control diploid, whereas 50 in the clone. The results suggest that chromosomes are duplicated by mitosis without cytokinesis before meiosis, i.e. premeiotic endomitosis and then oocytes differentiated from tetraploid oogonia undergo a quasinormal meiosis followed by two successive divisions to produce diploid eggs.

References

May 10, 1979·Nature·H R Kobel, L Du Pasquier
Nov 25, 1990·Nucleic Acids Research·J G WilliamsS V Tingey
Dec 25, 1990·Nucleic Acids Research·J Welsh, M McClelland
Jan 1, 1971·Hereditas·A NygrenM Jahnke
May 1, 1995·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·C OliveiraY A Tabata
Jun 8, 2004·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Kagayaki MorishimaKatsutoshi Arai

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Citations

Apr 2, 2010·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Ke Bi, James P Bogart
Oct 16, 2010·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Chizue HirutaShin Tochinai
Jul 5, 2007·Genetica·Kagayaki MorishimaKatsutoshi Arai
Oct 14, 2011·Proceedings. Biological Sciences·Matthias StöckNicolas Perrin
Oct 16, 2015·Biological Reviews of the Cambridge Philosophical Society·Maurine NeimanLawrence J Weider
Feb 22, 2011·Trends in Genetics : TIG·William B Neaves, Peter Baumann
Oct 27, 2012·Molecular Phylogenetics and Evolution·Fang-Fang JiangJian-Fang Gui
Jan 16, 2009·Biology of Reproduction·Hiroyuki YoshikawaKatsutoshi Arai
Nov 10, 2006·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Masaki ItonoKatsutoshi Arai
Dec 21, 2006·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Hiroyuki YoshikawaKatsutoshi Arai
Jun 9, 2018·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Masamichi KurodaKatsutoshi Arai
Feb 17, 2021·Genome Biology and Evolution·Zuzana MajtánováTariq Ezaz
Jul 6, 2021·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Seung Woon YunJong Young Park
Jul 27, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Matthias StöckKarel Janko
Nov 6, 2007·Current Biology : CB·Kathrin P LampertManfred Schartl
Oct 8, 2021·American Journal of Botany·Kathryn T PicardEric Schuettpelz

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