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Abstract:

Tityus trivittatus Kraepelin, 1898 is the most medically important scorpion species of Argentina, and parthenogenetic populations are present in the major cities of this country. We performed a detailed cytogenetic analysis of specimens of three synanthropic parthenogenetic populations, all distant about 900 km from each other, using Ag-NOR, C-banding, DAPI/CMA 3 staining and FISH with autologous 28S rDNA probes. The karyotype of females and embryos from the three populations showed 2n=6, with two large and four middle-sized holokinetic chromosomes. Constitutive heterochromatin was found in terminal and interstitial location and its pattern allowed the identification of three chromosome pairs. NORs were found on the terminal heterochromatic region of one pair of middle-sized chromosomes. The use of fluorochromes to characterize heterochromatin showed the absence of GC-rich heterochromatin and a low and variable number of AT-rich heterochromatic regions. We propose that a possible explanation for the lack of karyotypic variation between these geographically distant populations could be a recent colonization of urban areas by human means of synanthropic specimens from a single lineage of northeastern Argentina.

Registro:

Documento: Artículo
Título:Cytogenetic analysis on geographically distant parthenogenetic populations of Tityus trivittatus Kraepelin, 1898 (Scorpiones, Buthidae): Karyotype, constitutive heterochromatin and RDNA localization
Autor:Adilardi, R.S.; Affilastro, A.A.O.; Martí, D.A.; Mola, L.M.
Filiación:Laboratorio de Citogenética y Evolución - Departamento de Ecología, Genética y Evolución, IEGEBA (CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires - Intendente Güiraldes, 2160 - C1428EGA CABA, Argentina
División de Aracnología - Museo Argentino de Ciencias Naturales, Bernardino Rivadavia, CONICET - Ángel Gallardo, 470 - C1405DJR CABA, Argentina
Laboratorio de Genética Evolutiva, IBS (CONICET-UNaM), Félix de Azara 1552, CP3300 Posadas - Misiones, Argentina
Palabras clave:FISH; Holokinetic chromosomes; Karyotype; NOR; Parthenogenesis; Scorpion
Año:2014
Volumen:8
Número:2
Página de inicio:81
Página de fin:92
DOI: http://dx.doi.org/10.3897/CompCytogen.v8i2.6461
Título revista:Comparative Cytogenetics
Título revista abreviado:Comp. Cytogenet.
ISSN:19930771
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19930771_v8_n2_p81_Adilardi

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Citas:

---------- APA ----------
Adilardi, R.S., Affilastro, A.A.O., Martí, D.A. & Mola, L.M. (2014) . Cytogenetic analysis on geographically distant parthenogenetic populations of Tityus trivittatus Kraepelin, 1898 (Scorpiones, Buthidae): Karyotype, constitutive heterochromatin and RDNA localization. Comparative Cytogenetics, 8(2), 81-92.
http://dx.doi.org/10.3897/CompCytogen.v8i2.6461
---------- CHICAGO ----------
Adilardi, R.S., Affilastro, A.A.O., Martí, D.A., Mola, L.M. "Cytogenetic analysis on geographically distant parthenogenetic populations of Tityus trivittatus Kraepelin, 1898 (Scorpiones, Buthidae): Karyotype, constitutive heterochromatin and RDNA localization" . Comparative Cytogenetics 8, no. 2 (2014) : 81-92.
http://dx.doi.org/10.3897/CompCytogen.v8i2.6461
---------- MLA ----------
Adilardi, R.S., Affilastro, A.A.O., Martí, D.A., Mola, L.M. "Cytogenetic analysis on geographically distant parthenogenetic populations of Tityus trivittatus Kraepelin, 1898 (Scorpiones, Buthidae): Karyotype, constitutive heterochromatin and RDNA localization" . Comparative Cytogenetics, vol. 8, no. 2, 2014, pp. 81-92.
http://dx.doi.org/10.3897/CompCytogen.v8i2.6461
---------- VANCOUVER ----------
Adilardi, R.S., Affilastro, A.A.O., Martí, D.A., Mola, L.M. Cytogenetic analysis on geographically distant parthenogenetic populations of Tityus trivittatus Kraepelin, 1898 (Scorpiones, Buthidae): Karyotype, constitutive heterochromatin and RDNA localization. Comp. Cytogenet. 2014;8(2):81-92.
http://dx.doi.org/10.3897/CompCytogen.v8i2.6461