A heterozygous paracentric inversion only detectable through Electron Microscopy, in the grasshopper Dichroplus pratensis (Melanoplinae, Acrididae)

In this paper we describe a spontaneous heterozygous paracentric inversion in telocentric chromosome L2 of a Dichroplus pratensis male from a natural population of Argentina. This male was also heterozygous for two Robertsonian translocations. The inversion was only detected through transmission ele...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autor principal:	Bidau, Claudio Juan
Publicado:	2003
Materias:	Dichroplus pratensis Grasshopper Paracentric inversion Robertsonian translocation Synaptonemal complex Acrididae Dichroplus Melanoplinae Robertsonia
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00087114_v56_n2_p175_Marti http://hdl.handle.net/20.500.12110/paper_00087114_v56_n2_p175_Marti
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00087114_v56_n2_p175_Marti
record_format	dspace
spelling	paper:paper_00087114_v56_n2_p175_Marti2023-06-08T14:33:18Z A heterozygous paracentric inversion only detectable through Electron Microscopy, in the grasshopper Dichroplus pratensis (Melanoplinae, Acrididae) Bidau, Claudio Juan Dichroplus pratensis Grasshopper Paracentric inversion Robertsonian translocation Synaptonemal complex Acrididae Dichroplus Melanoplinae Robertsonia In this paper we describe a spontaneous heterozygous paracentric inversion in telocentric chromosome L2 of a Dichroplus pratensis male from a natural population of Argentina. This male was also heterozygous for two Robertsonian translocations. The inversion was only detected through transmission electron microscopy of synaptonemal complexes because in some pachytene nuclei a reverse loop was formed and the region distal to it remained unsynapsed. However, in other more advanced pachytene spermatocytes, nonhomologous (straight) pairing, was observed. Instead, analysis of the inversion mutant by light microscopy failed to reveal any pairing abnormalities except for a very low frequency of distal asynapsis of the L2 bivalent. Furthermore, no bridge and fragment configurations were observed nor any other abnormalities during the course of meiosis or the development of spermatids, that could indicate the presence of the inversion. The inversion also causes a significant repatterning of chiasmata in the L2 bivalent which could be due to heterosynapsis and/or desynapsis of the involved region. This could explain the absence of crossing over within the inverted region and thus, of aberrant recombinant chromatids. The relationship between paracentric inversions and Robertsonian translocations in D. pratensis, is discussed as well as the frequency of inversions in natural populations of this species. © 2003 Taylor & Francis Group, LLC. Fil:Bidau, C.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00087114_v56_n2_p175_Marti http://hdl.handle.net/20.500.12110/paper_00087114_v56_n2_p175_Marti
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Dichroplus pratensis Grasshopper Paracentric inversion Robertsonian translocation Synaptonemal complex Acrididae Dichroplus Melanoplinae Robertsonia
spellingShingle	Dichroplus pratensis Grasshopper Paracentric inversion Robertsonian translocation Synaptonemal complex Acrididae Dichroplus Melanoplinae Robertsonia Bidau, Claudio Juan A heterozygous paracentric inversion only detectable through Electron Microscopy, in the grasshopper Dichroplus pratensis (Melanoplinae, Acrididae)
topic_facet	Dichroplus pratensis Grasshopper Paracentric inversion Robertsonian translocation Synaptonemal complex Acrididae Dichroplus Melanoplinae Robertsonia
description	In this paper we describe a spontaneous heterozygous paracentric inversion in telocentric chromosome L2 of a Dichroplus pratensis male from a natural population of Argentina. This male was also heterozygous for two Robertsonian translocations. The inversion was only detected through transmission electron microscopy of synaptonemal complexes because in some pachytene nuclei a reverse loop was formed and the region distal to it remained unsynapsed. However, in other more advanced pachytene spermatocytes, nonhomologous (straight) pairing, was observed. Instead, analysis of the inversion mutant by light microscopy failed to reveal any pairing abnormalities except for a very low frequency of distal asynapsis of the L2 bivalent. Furthermore, no bridge and fragment configurations were observed nor any other abnormalities during the course of meiosis or the development of spermatids, that could indicate the presence of the inversion. The inversion also causes a significant repatterning of chiasmata in the L2 bivalent which could be due to heterosynapsis and/or desynapsis of the involved region. This could explain the absence of crossing over within the inverted region and thus, of aberrant recombinant chromatids. The relationship between paracentric inversions and Robertsonian translocations in D. pratensis, is discussed as well as the frequency of inversions in natural populations of this species. © 2003 Taylor & Francis Group, LLC.
author	Bidau, Claudio Juan
author_facet	Bidau, Claudio Juan
author_sort	Bidau, Claudio Juan
title	A heterozygous paracentric inversion only detectable through Electron Microscopy, in the grasshopper Dichroplus pratensis (Melanoplinae, Acrididae)
title_short	A heterozygous paracentric inversion only detectable through Electron Microscopy, in the grasshopper Dichroplus pratensis (Melanoplinae, Acrididae)
title_full	A heterozygous paracentric inversion only detectable through Electron Microscopy, in the grasshopper Dichroplus pratensis (Melanoplinae, Acrididae)
title_fullStr	A heterozygous paracentric inversion only detectable through Electron Microscopy, in the grasshopper Dichroplus pratensis (Melanoplinae, Acrididae)
title_full_unstemmed	A heterozygous paracentric inversion only detectable through Electron Microscopy, in the grasshopper Dichroplus pratensis (Melanoplinae, Acrididae)
title_sort	heterozygous paracentric inversion only detectable through electron microscopy, in the grasshopper dichroplus pratensis (melanoplinae, acrididae)
publishDate	2003
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00087114_v56_n2_p175_Marti http://hdl.handle.net/20.500.12110/paper_00087114_v56_n2_p175_Marti
work_keys_str_mv	AT bidauclaudiojuan aheterozygousparacentricinversiononlydetectablethroughelectronmicroscopyinthegrasshopperdichropluspratensismelanoplinaeacrididae AT bidauclaudiojuan heterozygousparacentricinversiononlydetectablethroughelectronmicroscopyinthegrasshopperdichropluspratensismelanoplinaeacrididae
_version_	1768546002358239232

A heterozygous paracentric inversion only detectable through Electron Microscopy, in the grasshopper Dichroplus pratensis (Melanoplinae, Acrididae)

Ejemplares similares