PMID: 8458253Feb 1, 1993Paper

Mechanism of chromosome elimination in the hybridogenetic spermatogenesis of allotriploid males between Japanese and European water frogs

Chromosoma
H Ohtani

Abstract

Of 21 allotriploid males that possessed two genomes of Rana nigromaculata and one genome of Rana lessonae 10 produced a large number of spermatozoa in their testes. When 4 of these males were backcrossed with a female of R. nigromaculata, all of the resulting froglets were diploid in chromosome number and were completely R. nigromaculata type in appearance. These allotriploid males proved to have produced spermatozoa with one R. nigromaculata genome hybridogenetically. Therefore, their germ line cells were investigated for the mechanism of elimination of their R. lessonae chromosomes. In histological sections of testes, the great majority of spermatogonia (approximately 10(4) cells) between mitotic prometaphase and anaphase appeared normal in chromosome behavior, whereas 17 spermatogonia showed several chromosomes whose behavior deviated from the normal course during the same period. These deviant chromosomes concentrated together near the equatorial plate and remained stationary at anaphase. In metaphase chromosome preparations made from spermatogonia, 67 and 185 of the 477 chromosome spreads were diploid and triploid, respectively. The rest were aneuploid. Notably, 8 triploid spreads consisted of 26 or more normal chromosomes...Continue Reading

References

Mar 15, 1976·Experientia·P Vogel, P S Chen
Apr 1, 1981·Die Naturwissenschaften·H G Tunner, S Heppich
Jun 1, 1982·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·S HeppichJ Greilhuber
Jun 1, 1972·Evolution; International Journal of Organic Evolution·Michael C Cimino

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Citations

Apr 4, 2007·Molecular Ecology·A G F CastilloE Garcia-Vazquez
Feb 12, 2002·Nature Genetics·Matthias StöckManfred Schartl
Mar 14, 2007·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Carla Sousa-SantosVitor Almada

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