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Abstract:

The genus Dysdercus Guerin Meneville 1831 represents the only taxon within the family Pyrrhocoridae in the New World. Based on morphological features, it has been suggested that American species derived from immigrants from the Old World, most probably from the Ethiopian Region. So far, 10 species from Dysdercus, including six species from the Old World and four species from the Neotropical Region have been cytogenetically analyzed. As is characteristic of Heteroptera, they possess holokinetic chromosomes and a prereductional type of meiosis. While the X1X2O sex chromosome system has been reported in all cytologically analyzed species of Dysdercus from the Old World, the system X0 has been found in all but one species from the New World, regardless of the number of autosomes in the complement. In the present study the male meiosis of D. albofasciatus Berg 1878 was studied in specimens from four different populations from Argentina. The diploid chromosome number was found to be 2n = 10 + neo-XY. The neo-X shows at each subterminal region a positively heteropycnotic and DAPI-bright segment which corresponds to the ancestral X-chromosome. The origin of this neo-XY system involved, most probably, a subterminal insertion of the ancestral X chromosome in an autosome, followed by a large inversion, which included part of the original X chromosome.

Registro:

Documento: Artículo
Título:Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera
Autor:Bressa, M.J.; Papeschi, A.G.; Mola, L.M.; Larramendy, M.L.
Filiación:Lab. Citogenetica/Catedra de Citol., Facultad de Ciencias Naturales, Universidad Nacional de La Plata, Calle 37 Nro. 668 7mo B, 1900 La Plata, Argentina
Departamento de Ciencias Biologicas, FCEN, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Dysdercus albofasciatus; Heteroptera; Holokinetic chromosomes; Neo-XY; Pyrrhocoridae; amino acid sequence; animal cell; article; autosome; chromosome analysis; chromosome number; diploidy; Heteroptera; insect; meiosis; metaphase; nonhuman; priority journal; sex chromosome; X chromosome; Animals; Heteroptera; Karyotyping; Male; Meiosis; X Chromosome; Y Chromosome; Animalia; Arachnida; Dysdercus; Heteroptera; Hexapoda; Insecta; Pyrrhocoridae
Año:1999
Volumen:7
Número:7
Página de inicio:503
Página de fin:508
DOI: http://dx.doi.org/10.1023/A:1009262210338
Título revista:Chromosome Research
Título revista abreviado:Chromosome Res.
ISSN:09673849
CODEN:CRRSE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09673849_v7_n7_p503_Bressa

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Citas:

---------- APA ----------
Bressa, M.J., Papeschi, A.G., Mola, L.M. & Larramendy, M.L. (1999) . Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera. Chromosome Research, 7(7), 503-508.
http://dx.doi.org/10.1023/A:1009262210338
---------- CHICAGO ----------
Bressa, M.J., Papeschi, A.G., Mola, L.M., Larramendy, M.L. "Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera" . Chromosome Research 7, no. 7 (1999) : 503-508.
http://dx.doi.org/10.1023/A:1009262210338
---------- MLA ----------
Bressa, M.J., Papeschi, A.G., Mola, L.M., Larramendy, M.L. "Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera" . Chromosome Research, vol. 7, no. 7, 1999, pp. 503-508.
http://dx.doi.org/10.1023/A:1009262210338
---------- VANCOUVER ----------
Bressa, M.J., Papeschi, A.G., Mola, L.M., Larramendy, M.L. Meiotic studies in Dysdercus Guerin Meneville 1831 (Heteroptera: Pyrrhocoridae). I. Neo-XY in Dysdercus albofasciatus Berg 1878, a new sex chromosome determining system in Heteroptera. Chromosome Res. 1999;7(7):503-508.
http://dx.doi.org/10.1023/A:1009262210338