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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.


Documento: Artículo
Título:Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon
Autor:Ortells, M.O.; Reig, O.A.; Brum-Zorrilla, N.; Scaglia, O.A.
Filiación:G.I.B.E., Departamento de Ciencias Biologicas, FCEyN, Universidad de Buenos Aires, Pabellon II, Cuarto Piso, Ciudad Universitaria Nuñez, Buenos Aires, 1428, Argentina
Comision de Investigaciones Cientificas de la Provincia de Buenos Aires, Argentina
National Research Council of Argentina (CONICET), Cordoba, Argentina
Institute de Investigaciones Biologicas 'Clemente Estable', Avenida Italia 3318, Montevideo, Uruguay
Museo Municipal de Ciencias Naturales 'Lorenzo Scaglia', Casillade Correo 1207, Mar del Plata, 7600, Argentina
National Research Council of Argentina (CONICET), Cordoba, Argentina
Palabras clave: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)
Página de inicio:53
Página de fin:63
Título revista:Genetica
Título revista abreviado:Genetica


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---------- APA ----------
Ortells, M.O., Reig, O.A., Brum-Zorrilla, N. & Scaglia, O.A. (1988) . Cytogenetics and karyosystematics of phyllotine rodents (Cricetidae, Sigmodontinae) I. Chromosome multiformity and gonosomal-autosomal translocation in Reithrodon. Genetica, 77(1), 53-63.
---------- CHICAGO ----------
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" . Genetica 77, no. 1 (1988) : 53-63.
---------- MLA ----------
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" . Genetica, vol. 77, no. 1, 1988, pp. 53-63.
---------- VANCOUVER ----------
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. Genetica. 1988;77(1):53-63.