Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae)

Synaptic behaviour and the progression of morphological differentiation of the XY chromosome pair during pachytene was studied for the first time in three species of the South American subterranean rodents of the genus Ctenomys (tuco-tucos). In general, synapsis progression in the sex pair could be...

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Autor principal:	Bidau, Claudio Juan
Publicado:	2002
Materias:	Ctenomys Meiosis Robertsonian translocations Sex chromosomes Synapsis Caviomorpha Ctenomyidae Robertsonia Rodentia animal article chromosome pairing classification genetics male meiosis rodent species difference X chromosome Y chromosome Animals Chromosome Pairing Male Species Specificity X Chromosome Y Chromosome
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08312796_v45_n6_p1110_Lanzone http://hdl.handle.net/20.500.12110/paper_08312796_v45_n6_p1110_Lanzone
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08312796_v45_n6_p1110_Lanzone
record_format	dspace
spelling	paper:paper_08312796_v45_n6_p1110_Lanzone2023-06-08T15:46:15Z Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae) Bidau, Claudio Juan Ctenomys Meiosis Robertsonian translocations Sex chromosomes Synapsis Caviomorpha Ctenomyidae Ctenomys Robertsonia Rodentia Synapsis animal article chromosome pairing classification genetics male meiosis rodent species difference X chromosome Y chromosome Animals Chromosome Pairing Male Meiosis Rodentia Species Specificity X Chromosome Y Chromosome Synaptic behaviour and the progression of morphological differentiation of the XY chromosome pair during pachytene was studied for the first time in three species of the South American subterranean rodents of the genus Ctenomys (tuco-tucos). In general, synapsis progression in the sex pair could be subdivided into four substages: (i) initial partial synapsis of the X and Y chromosome axes and beginning of the differentiation of the unsynapsed regions; (ii) complete or almost complete synapsis of the Y axis accompanied with morphological differentiation of the unsynapsed region of the X chromosome; (iii) a novel stage exclusive to Ctenomys perrensi consisting in a retraction of the free X axis, associated with the formation of a homogeneous and dense structure along the synaptic region, which leads to the achievement of full synapsis between sex chromosomes; or (iv) an increase in morphological complexity involving extreme splitting of the XY pair. The implications of the peculiar synaptic behaviour displayed by sex chromosomes in C. perrensi, a species complex highly polymorphic for Robertsonian translocations, are discussed in relation to both the triggering of the pachytene checkpoint and the avoidance of non-homologous associations between sex chromosomes and the asynaptic pericentromeric regions of trivalents in translocation heterozygotes. © 2002 NRC. Fil:Bidau, C.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08312796_v45_n6_p1110_Lanzone http://hdl.handle.net/20.500.12110/paper_08312796_v45_n6_p1110_Lanzone
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Ctenomys Meiosis Robertsonian translocations Sex chromosomes Synapsis Caviomorpha Ctenomyidae Ctenomys Robertsonia Rodentia Synapsis animal article chromosome pairing classification genetics male meiosis rodent species difference X chromosome Y chromosome Animals Chromosome Pairing Male Meiosis Rodentia Species Specificity X Chromosome Y Chromosome
spellingShingle	Ctenomys Meiosis Robertsonian translocations Sex chromosomes Synapsis Caviomorpha Ctenomyidae Ctenomys Robertsonia Rodentia Synapsis animal article chromosome pairing classification genetics male meiosis rodent species difference X chromosome Y chromosome Animals Chromosome Pairing Male Meiosis Rodentia Species Specificity X Chromosome Y Chromosome Bidau, Claudio Juan Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae)
topic_facet	Ctenomys Meiosis Robertsonian translocations Sex chromosomes Synapsis Caviomorpha Ctenomyidae Ctenomys Robertsonia Rodentia Synapsis animal article chromosome pairing classification genetics male meiosis rodent species difference X chromosome Y chromosome Animals Chromosome Pairing Male Meiosis Rodentia Species Specificity X Chromosome Y Chromosome
description	Synaptic behaviour and the progression of morphological differentiation of the XY chromosome pair during pachytene was studied for the first time in three species of the South American subterranean rodents of the genus Ctenomys (tuco-tucos). In general, synapsis progression in the sex pair could be subdivided into four substages: (i) initial partial synapsis of the X and Y chromosome axes and beginning of the differentiation of the unsynapsed regions; (ii) complete or almost complete synapsis of the Y axis accompanied with morphological differentiation of the unsynapsed region of the X chromosome; (iii) a novel stage exclusive to Ctenomys perrensi consisting in a retraction of the free X axis, associated with the formation of a homogeneous and dense structure along the synaptic region, which leads to the achievement of full synapsis between sex chromosomes; or (iv) an increase in morphological complexity involving extreme splitting of the XY pair. The implications of the peculiar synaptic behaviour displayed by sex chromosomes in C. perrensi, a species complex highly polymorphic for Robertsonian translocations, are discussed in relation to both the triggering of the pachytene checkpoint and the avoidance of non-homologous associations between sex chromosomes and the asynaptic pericentromeric regions of trivalents in translocation heterozygotes. © 2002 NRC.
author	Bidau, Claudio Juan
author_facet	Bidau, Claudio Juan
author_sort	Bidau, Claudio Juan
title	Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae)
title_short	Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae)
title_full	Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae)
title_fullStr	Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae)
title_full_unstemmed	Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae)
title_sort	synaptic behaviour and morphological modifications of the x and y chromosomes during pachytene in three species of ctenomys (rodentia, caviomorpha, ctenomyidae)
publishDate	2002
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08312796_v45_n6_p1110_Lanzone http://hdl.handle.net/20.500.12110/paper_08312796_v45_n6_p1110_Lanzone
work_keys_str_mv	AT bidauclaudiojuan synapticbehaviourandmorphologicalmodificationsofthexandychromosomesduringpachyteneinthreespeciesofctenomysrodentiacaviomorphactenomyidae
_version_	1768544555100012544

Synaptic behaviour and morphological modifications of the X and Y chromosomes during pachytene in three species of Ctenomys (Rodentia, Caviomorpha, Ctenomyidae)

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