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Abstract:

In this study, we analysed a population of Zelurus femoralis longispinis polymorphic for chromosomal number. The fundamental karyotype of this subspecies is 2n=22=20A+XY (male), but individuals with 2n=23=20A+XY+extra chromosome have been found at high frequency and collected at different time periods. We examined male meiotic behaviour, average length as percentage of the sex chromosomes, the content, distribution and composition of heterochromatin, and the number and location of ribosomal DNA in the two cytotypes found. The meiotic behaviour of the extra chromosome was highly regular and similar to that of sex chromosomes. The average length of the sex chromosomes in individuals not carrying the extra chromosome was significantly greater than in those carrying it. The results support a hypothesis that the extra chromosome might have originated by fragmentation of the original X chromosome into two unequal-sized chromosomes (X1 and X2), leading to an X1X2Y multiple system. Maintenance of the polymorphism with time appears to indicate that the new chromosomal variant is neutral or at least not detrimental, or that it could be selectively advantageous. This polymorphic population represents direct evidence of a multiple sex chromosome system originating through fragmentation of a single X in Reduviidae as well as in Heteroptera. © 2013 The Linnean Society of London.

Registro:

Documento: Artículo
Título:Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae)
Autor:Poggio, M.G.; Provecho, Y.M.; Papeschi, A.G.; Bressa, M.J.
Filiación:Instituto de Ecología, Genetica y Evolucion de Buenos Aires (IEGEBA), Departamento de Ecologia, Genetica y Evolucion, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
Laboratorio de Eco-Epidemiología, Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), Depto. de Ecologia Genetica y Evolucion Facultad de Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave:C- and fluorescent bands; Chromosomal fragmentation; Evolution; FISH; Holokinetic chromosomes; Multiple sex-chromosome system; chromosome; cytology; evolutionary biology; genetic structure; insect; karyotype; polymorphism; Heteroptera; Reduviidae; Reduviinae; Zelurus
Año:2013
Volumen:110
Número:4
Página de inicio:757
Página de fin:764
DOI: http://dx.doi.org/10.1111/bij.12168
Título revista:Biological Journal of the Linnean Society
Título revista abreviado:Biol. J. Linn. Soc.
ISSN:00244066
CODEN:BJLSB
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00244066_v110_n4_p757_Poggio.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244066_v110_n4_p757_Poggio

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Citas:

---------- APA ----------
Poggio, M.G., Provecho, Y.M., Papeschi, A.G. & Bressa, M.J. (2013) . Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae). Biological Journal of the Linnean Society, 110(4), 757-764.
http://dx.doi.org/10.1111/bij.12168
---------- CHICAGO ----------
Poggio, M.G., Provecho, Y.M., Papeschi, A.G., Bressa, M.J. "Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae)" . Biological Journal of the Linnean Society 110, no. 4 (2013) : 757-764.
http://dx.doi.org/10.1111/bij.12168
---------- MLA ----------
Poggio, M.G., Provecho, Y.M., Papeschi, A.G., Bressa, M.J. "Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae)" . Biological Journal of the Linnean Society, vol. 110, no. 4, 2013, pp. 757-764.
http://dx.doi.org/10.1111/bij.12168
---------- VANCOUVER ----------
Poggio, M.G., Provecho, Y.M., Papeschi, A.G., Bressa, M.J. Possible origin of polymorphism for chromosome number in the assassin bug Zelurus femoralis longispinis (Reduviidae: Reduviinae). Biol. J. Linn. Soc. 2013;110(4):757-764.
http://dx.doi.org/10.1111/bij.12168