Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)

Nucleotypic effects link DNA content with nuclear size and cell dimensions of reproductive cells in polyploid organisms. We studied the gametogenesis of the allotetraploid rodent Tympanoctomys barrerae, aiming to determine these effects in reproductive cells. The species' cofamily members, Octo...

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Autores principales:	GALLARDO,MILTON H, GARRIDO,ORLANDO, BAHAMONDE,RAÚL, GONZÁLEZ,MARCELO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2004
Materias:	nucleotypic effects oogenesis spermatogenesis Octodontidae Tympanoctomys barrerae tetraploidy
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000500006
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spelling	oai:scielo:S0716-976020040005000062005-06-01Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)GALLARDO,MILTON HGARRIDO,ORLANDOBAHAMONDE,RAÚLGONZÁLEZ,MARCELO nucleotypic effects oogenesis spermatogenesis Octodontidae Tympanoctomys barrerae tetraploidy Nucleotypic effects link DNA content with nuclear size and cell dimensions of reproductive cells in polyploid organisms. We studied the gametogenesis of the allotetraploid rodent Tympanoctomys barrerae, aiming to determine these effects in reproductive cells. The species' cofamily members, Octodon degus and Spalacopus cyanus were used as control. Spermatogenesis and oogenesis in T. barrerae follows the pattern of differentiation and sequence of events of the control species, but varied nucleotypic effects were observed. Exceedingly large, spatulated spermatozoa with a submedially attached flagellum are characteristic of male T. barrerae. The diameter of the nuclei of primordial and growing follicles as well as those of the Graaff follicles, of the granulose, and of luteal cells are significantly larger and heavily heterochromatic. Moreover, the width of the pellucid zone is 108% thicker in T. barrerae than in S. cyanus. Binucleation was recorded in 26% of luteal bodies examined whereas no binucleated cells are detected in the diploid control. Likewise, large heterochromatic nucleoli were observed in the follicle cells but not in S. cyanus. This finding and the high heterochromatin content of reproductive cells in the red vizcacha rat is probably associated with its genome complexity so that redundant genetic information is silenced through heterochromatinizationinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileBiological Research v.37 n.4 suppl.A 20042004-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000500006en10.4067/S0716-97602004000500006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	nucleotypic effects oogenesis spermatogenesis Octodontidae Tympanoctomys barrerae tetraploidy
spellingShingle	nucleotypic effects oogenesis spermatogenesis Octodontidae Tympanoctomys barrerae tetraploidy GALLARDO,MILTON H GARRIDO,ORLANDO BAHAMONDE,RAÚL GONZÁLEZ,MARCELO Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)
description	Nucleotypic effects link DNA content with nuclear size and cell dimensions of reproductive cells in polyploid organisms. We studied the gametogenesis of the allotetraploid rodent Tympanoctomys barrerae, aiming to determine these effects in reproductive cells. The species' cofamily members, Octodon degus and Spalacopus cyanus were used as control. Spermatogenesis and oogenesis in T. barrerae follows the pattern of differentiation and sequence of events of the control species, but varied nucleotypic effects were observed. Exceedingly large, spatulated spermatozoa with a submedially attached flagellum are characteristic of male T. barrerae. The diameter of the nuclei of primordial and growing follicles as well as those of the Graaff follicles, of the granulose, and of luteal cells are significantly larger and heavily heterochromatic. Moreover, the width of the pellucid zone is 108% thicker in T. barrerae than in S. cyanus. Binucleation was recorded in 26% of luteal bodies examined whereas no binucleated cells are detected in the diploid control. Likewise, large heterochromatic nucleoli were observed in the follicle cells but not in S. cyanus. This finding and the high heterochromatin content of reproductive cells in the red vizcacha rat is probably associated with its genome complexity so that redundant genetic information is silenced through heterochromatinization
author	GALLARDO,MILTON H GARRIDO,ORLANDO BAHAMONDE,RAÚL GONZÁLEZ,MARCELO
author_facet	GALLARDO,MILTON H GARRIDO,ORLANDO BAHAMONDE,RAÚL GONZÁLEZ,MARCELO
author_sort	GALLARDO,MILTON H
title	Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)
title_short	Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)
title_full	Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)
title_fullStr	Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)
title_full_unstemmed	Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)
title_sort	gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, tympanoctomys barrerae (rodentia, octodontidae)
publisher	Sociedad de Biología de Chile
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000500006
work_keys_str_mv	AT gallardomiltonh gametogenesisandnucleotypiceffectsinthetetraploidredvizcacharattympanoctomysbarreraerodentiaoctodontidae AT garridoorlando gametogenesisandnucleotypiceffectsinthetetraploidredvizcacharattympanoctomysbarreraerodentiaoctodontidae AT bahamonderaul gametogenesisandnucleotypiceffectsinthetetraploidredvizcacharattympanoctomysbarreraerodentiaoctodontidae AT gonzalezmarcelo gametogenesisandnucleotypiceffectsinthetetraploidredvizcacharattympanoctomysbarreraerodentiaoctodontidae
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Gametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)

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