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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Autores principales: Ortells, M.O., Reig, O.A., Brum-Zorrilla, N., Scaglia, O.A.
Formato: JOUR
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: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 todo:paper_00166707_v77_n1_p53_Ortells
record_format dspace
spelling todo:paper_00166707_v77_n1_p53_Ortells2023-10-03T14:14:24Z Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon Ortells, M.O. Reig, O.A. Brum-Zorrilla, N. Scaglia, O.A. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, M.O.
Reig, O.A.
Brum-Zorrilla, N.
Scaglia, O.A.
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.
format JOUR
author Ortells, M.O.
Reig, O.A.
Brum-Zorrilla, N.
Scaglia, O.A.
author_facet Ortells, M.O.
Reig, O.A.
Brum-Zorrilla, N.
Scaglia, O.A.
author_sort Ortells, M.O.
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
url http://hdl.handle.net/20.500.12110/paper_00166707_v77_n1_p53_Ortells
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