Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon

The chromosomes of 14 specimens of the genus Reithrodon from three different localities of Argentina and two localities of Uruguay were studied using G-and C-banding techniques. Specimens of Uruguay showed a karyotype of 2n=28 chromosomes having a large metacentric X, and a telocentric Y chromosome....

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Detalles Bibliográficos
Autor principal: Ortells, Marcelo Oscar
Publicado: 1988
Materias:
animal
article
chromosome banding pattern
chromosome translocation
female
genetics
karyotyping
male
Muridae
sex chromosome
Animal
Chromosome Banding
Female
Karyotyping
Male
Microtinae
Sex Chromosomes
Support, Non-U.S. Gov't
Translocation (Genetics)
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v77_n1_p53_Ortells
http://hdl.handle.net/20.500.12110/paper_00166707_v77_n1_p53_Ortells
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00166707_v77_n1_p53_Ortells
record_format dspace
spelling paper:paper_00166707_v77_n1_p53_Ortells2023-06-08T14:38:37Z Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon Ortells, Marcelo Oscar animal article chromosome banding pattern chromosome translocation female genetics karyotyping male Muridae sex chromosome Animal Chromosome Banding Female Karyotyping Male Microtinae Sex Chromosomes Support, Non-U.S. Gov't Translocation (Genetics) The chromosomes of 14 specimens of the genus Reithrodon from three different localities of Argentina and two localities of Uruguay were studied using G-and C-banding techniques. Specimens of Uruguay showed a karyotype of 2n=28 chromosomes having a large metacentric X, and a telocentric Y chromosome. This karyotype is very similar to that recently described in a sample from southern Brazil, differing only in the nature of the Y chromosome, which is metacentric in the Brazilian form. All specimens from Argentina showed a 2n=34 karyotype, differing from the Brazilian karyotype by two centric fusions, an acquisition of chromosome material, and at least one pericentric inversion, and by the telocentric nature of both the X and the Y chromosomes. G-and C-banding suggest that the metacentric gonosomes in the Brazilian form resulted from a double autosomal-X-Y Robertsonian translocation. The Uruguayan cytotype is interpreted as derived from a hypothetical neo-X/Y1Y2 ancestral form by the secondary loss of the Y1 chromosome. The karyotypic differences between the Brazilian-Uruguayan and the Argentinian forms afford evidence of species differentiation. It is proposed to assign the former to Reithrodon typicus, and the later to R. auritus. © 1988 Kluwer Academic Publishers. Fil:Ortells, M.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1988 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v77_n1_p53_Ortells http://hdl.handle.net/20.500.12110/paper_00166707_v77_n1_p53_Ortells
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic animal
article
chromosome banding pattern
chromosome translocation
female
genetics
karyotyping
male
Muridae
sex chromosome
Animal
Chromosome Banding
Female
Karyotyping
Male
Microtinae
Sex Chromosomes
Support, Non-U.S. Gov't
Translocation (Genetics)
spellingShingle animal
article
chromosome banding pattern
chromosome translocation
female
genetics
karyotyping
male
Muridae
sex chromosome
Animal
Chromosome Banding
Female
Karyotyping
Male
Microtinae
Sex Chromosomes
Support, Non-U.S. Gov't
Translocation (Genetics)
Ortells, Marcelo Oscar
Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon
topic_facet animal
article
chromosome banding pattern
chromosome translocation
female
genetics
karyotyping
male
Muridae
sex chromosome
Animal
Chromosome Banding
Female
Karyotyping
Male
Microtinae
Sex Chromosomes
Support, Non-U.S. Gov't
Translocation (Genetics)
description The chromosomes of 14 specimens of the genus Reithrodon from three different localities of Argentina and two localities of Uruguay were studied using G-and C-banding techniques. Specimens of Uruguay showed a karyotype of 2n=28 chromosomes having a large metacentric X, and a telocentric Y chromosome. This karyotype is very similar to that recently described in a sample from southern Brazil, differing only in the nature of the Y chromosome, which is metacentric in the Brazilian form. All specimens from Argentina showed a 2n=34 karyotype, differing from the Brazilian karyotype by two centric fusions, an acquisition of chromosome material, and at least one pericentric inversion, and by the telocentric nature of both the X and the Y chromosomes. G-and C-banding suggest that the metacentric gonosomes in the Brazilian form resulted from a double autosomal-X-Y Robertsonian translocation. The Uruguayan cytotype is interpreted as derived from a hypothetical neo-X/Y1Y2 ancestral form by the secondary loss of the Y1 chromosome. The karyotypic differences between the Brazilian-Uruguayan and the Argentinian forms afford evidence of species differentiation. It is proposed to assign the former to Reithrodon typicus, and the later to R. auritus. © 1988 Kluwer Academic Publishers.
author Ortells, Marcelo Oscar
author_facet Ortells, Marcelo Oscar
author_sort Ortells, Marcelo Oscar
title Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon
title_short Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon
title_full Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon
title_fullStr Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon
title_full_unstemmed Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon
title_sort cytogenetics and karyosystematics of phyllotine rodents (cricetidae, sigmodontinae) i. chromosome multiformity and gonosomal-autosomal translocation in reithrodon
publishDate 1988
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v77_n1_p53_Ortells
http://hdl.handle.net/20.500.12110/paper_00166707_v77_n1_p53_Ortells
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