Artículo
Abstract:
Dichroplus elongatus, a widespread South American phytophagous grasshopper, exhibits polymorphisms for supernumerary chromosomes and segments (SS) in natural populations in Argentina. In this paper we review the available information on B chromosome polymorphism in D. elongatus related to geographic distribution, patterns of chromosome variation and influence on sperm formation. In D. elongatus the different forms of supernumerary variants are not independent. The proportion of B-carrying individuals (B prevalence) is negatively correlated with SS10 and positively with SS6 frequencies. The analysis of population structure considering the different supernumerary variants would suggest that the patterns of chromosome variation can not be explained only by random factors. Geographic distribution was analyzed scoring the prevalence of B chromosomes in 13 natural populations collected in three different biogeographical provinces from Northwest (Las Yungas province) and East (Espinal and Pampeana provinces) of Argentina. The detected heterogeneity may be explained by significant differentiation between Northwest and East regions and among populations within Las Yungas and Pampeana provinces. Correlation analysis suggested that B chromosome prevalence is associated with maximum temperature and with latitude. Additional information about the nature of the patterns of B chromosome variation was obtained comparing them with those obtained at the mitochondrial DNA level. The hierarchical analysis of molecular differentiation revealed discrepancy with respect to chromosome differentiation and also suggested that the pattern of B chromosomes may not be explained by historical factors. We also discussed the probable influence on fertility of carriers considering the production of abnormal sperm formation (macro and microspermatids) in relation to the number of Bs per follicle. Copyright © 2004 S. Karger AG, Basel.
Registro:
| Documento: | Artículo |
| Título: | Mitotically unstable B chromosome polymorphism in the grasshopper Dichroplus elongatus |
| Autor: | Remis, M.I.; Vilardi, J.C. |
| Filiación: | Depto. Ecologia, Genet. y Evol., Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina Depto. Ecologia, Genet. y Evol., Fac. Cs. Exactas y Naturales, Univ. Buenos Aires, 1428 Buenos Aires, Argentina |
| Palabras clave: | mitochondrial DNA; Argentina; autosome; chromosome segregation; chromosome variant; correlation analysis; Dichroplus elongatus; fertility; genetic heterogeneity; genetic polymorphism; geographic distribution; grasshopper; mitosis; nonhuman; prevalence; priority journal; review; scoring system; spermatogenesis; supernumerary chromosome; Animals; Chromosomal Instability; Chromosomes; Grasshoppers; Mitosis; Polymorphism, Genetic; Dichroplus; Dichroplus elongatus |
| Año: | 2004 |
| Volumen: | 106 |
| Número: | 2-4 |
| Página de inicio: | 359 |
| Página de fin: | 364 |
| DOI: | http://dx.doi.org/10.1159/000079313 |
| Título revista: | Cytogenetic and Genome Research |
| Título revista abreviado: | Cytogenet. Genome Res. |
| ISSN: | 14248581 |
| CODEN: | CGRYA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14248581_v106_n2-4_p359_Remis |
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Citas:
---------- APA ----------
Remis, M.I. & Vilardi, J.C. (2004) . Mitotically unstable B chromosome polymorphism in the grasshopper Dichroplus elongatus. Cytogenetic and Genome Research, 106(2-4), 359-364.http://dx.doi.org/10.1159/000079313
---------- CHICAGO ----------
Remis, M.I., Vilardi, J.C. "Mitotically unstable B chromosome polymorphism in the grasshopper Dichroplus elongatus" . Cytogenetic and Genome Research 106, no. 2-4 (2004) : 359-364.http://dx.doi.org/10.1159/000079313
---------- MLA ----------
Remis, M.I., Vilardi, J.C. "Mitotically unstable B chromosome polymorphism in the grasshopper Dichroplus elongatus" . Cytogenetic and Genome Research, vol. 106, no. 2-4, 2004, pp. 359-364.http://dx.doi.org/10.1159/000079313
---------- VANCOUVER ----------
Remis, M.I., Vilardi, J.C. Mitotically unstable B chromosome polymorphism in the grasshopper Dichroplus elongatus. Cytogenet. Genome Res. 2004;106(2-4):359-364.http://dx.doi.org/10.1159/000079313
