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Abstract:

Heterochromatin is one of the most dynamic components in the genome of species. Previous studies on the heterochromatin content and distribution in Heteroptera (insects with holokinetic chromosomes) have shown that the species belonging to the family Coreidae are interesting model organisms since they show very diverse C bands patterns. In the present work, we analyzed the C-band pattern in individuals of Holhymenia rubiginosa from different populations collected in different years. This species has the diploid karyotype 2n=27/28=24 + 2m + X0/XX (male/female). C-bands are terminally, subterminally or interstitially located on 10-17 chromosomes and a remarkable heterochromatin heteromorphism is observed in the meiotic bivalents: in the presence/ absence of bands, in the size of bands and number of bands. A heteromorphism is also inferred in the number of ribosomal genes from the difference in the fluorescent in situ hybridization signals between NOR-homologues. Chiasmata are generally located opposite to conspicuous C-bands, but in some bivalents chiasmata are also observed in close proximity to C-bands. Considering the striking variation in heterochromatin content between individuals and populations it is suggested that heterochromatin should be selectively neutral in H. rubiginosa.

Registro:

Documento: Artículo
Título:Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)
Autor:Bressa, M.J.; Franco, M.J.; Toscani, M.A.; Papeschi, A.G.
Filiación:Laboratorio de Citogenética y Evolución, Departamento de Ecología Genética y Evolución, Universidad de Buenos Aires, Int. Güiraldes 2160, C1428EGA Ciudad Universitaria, Argentina
Centro de Investigaciones en Reproducción, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
Members of the Carrera del Investigador Cientifico (CONICET)
Palabras clave:C-banding; Coreidae; Fluorescent in situ hybridization; Fluorescent-banding; Holokinetic chromosomes; Karyotype evolution; rDNA; chromosome; fluorescence; genome; hybridization; insect; karyotype; Coreidae; Heteroptera; Hexapoda; Holhymenia
Año:2008
Volumen:105
Número:1
Página de inicio:65
Página de fin:72
DOI: http://dx.doi.org/10.14411/eje.2008.009
Título revista:European Journal of Entomology
Título revista abreviado:Eur. J. Entomol.
ISSN:12105759
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_12105759_v105_n1_p65_Bressa

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Citas:

---------- APA ----------
Bressa, M.J., Franco, M.J., Toscani, M.A. & Papeschi, A.G. (2008) . Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae). European Journal of Entomology, 105(1), 65-72.
http://dx.doi.org/10.14411/eje.2008.009
---------- CHICAGO ----------
Bressa, M.J., Franco, M.J., Toscani, M.A., Papeschi, A.G. "Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)" . European Journal of Entomology 105, no. 1 (2008) : 65-72.
http://dx.doi.org/10.14411/eje.2008.009
---------- MLA ----------
Bressa, M.J., Franco, M.J., Toscani, M.A., Papeschi, A.G. "Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)" . European Journal of Entomology, vol. 105, no. 1, 2008, pp. 65-72.
http://dx.doi.org/10.14411/eje.2008.009
---------- VANCOUVER ----------
Bressa, M.J., Franco, M.J., Toscani, M.A., Papeschi, A.G. Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae). Eur. J. Entomol. 2008;105(1):65-72.
http://dx.doi.org/10.14411/eje.2008.009