Se observan bandas en los brazos largos de L 2 y L 4 de A. The bands are observed in the long arms of L 2 and L 4 of A. These results and the notorious heteromorphy between different chromosome pairs, supports the hypothesis of the origin of A. Debido a que muchas de sus especies [cf.

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The tribe Phyllotini is an advanced group of 46 endemic species among the Muridae of South America, that being adapted to its xeric environments, seems to have the Southern Altiplano as its original differentiation area Reig This hypothesis is tested by examining the geographic distributions and cytogenetic data from 35 species, including the Andinomys edax and Euneomys chichilloides G band descriptions, its comparison with Phyllotis , AgNOR bands and rDNA FISH in seven species, as well as protein electrophoresis data electro-alleles in 12 species and cytochrome b gen sequences in the mtDNA bp in 14 species.

All karyotypes were chromosomically different, except in two cases with unknown G bands. A general association between altiplanic distribution of species with ancestral character states telocentric chromosomes, high 2n, basal positions in phylogenies based on protein and cytochrome b gene sequences was found, as well as between non-altiplanic distribution with derived states.

Different combinations of Andinomys -like chromosomal arms that would have suffered centric fusions to form the metacentric chromosomes of Euneomys and Phyllotis, respectively, are documented here, and also a reduction of the number of structural NOR in Auliscomys compared to Loxodontomys , all derived features showing a diversification to the south and another to the north respectively, from a center in the southern Altiplano.

Key words: chromosomes, phylogeny, protein electrophoresis, cytochrome b, Altiplano. Nombre completo de las especies en Anexo I. Karyograph of the Phyllotini tribe comparing Fundamental Number NF, total number of visible arms observed in the male karyotype and diploid number 2n of species.

Complete name of species in Annex I. The akodontine Abrothrix was included as outgroup. Las metafases se observaron y fotografiaron en un microscopio de epifluorescencia.

El gen mitocondrial para citocromo b fue amplificado por PCR Saiki et al. All the chromosomes, ordered and numbered according to size and morphology, are telocentric except for a single small metacentric pair N o Comparison of G-banded chromosomes of Andinomys edax, Euneomys chinchilloides and Phyllotis xanthopygus : a E. Otros dos cromosomas de E. Comparaciones similares entre A. En Phyllotis darwini, P.

Active NOR-bearing chromosomes a, c, e are identified with the numbers of the original karyotype descriptions see Tables 2 and 3 and those carrying structural NOR, with thin arrows b, d, f.

The abundant pericentromeric heterochromatin of P. Most parsimonious phylogenetic tree based on electro-alleles detected by protein electrophoresis systems, number of specimens and character matrix in Appendix 2. Las especies de Loxodontomys y Auliscomys ocuparon posiciones intermedias entre Phyllotis y el resto de los filotinos Fig.

More parsimonious phylogenic tree based on base sequences for sites of the gen for cytochrome b. Los grupos filotinos basales fueron: primero Calomys , definido por cinco sitios 26, 35, , y , que aumentaron a seis en la matriz reducida de caracteres, seguido por el grupo de cuatro especies de Eligmodontia , definido por los sitios 12, 93 y Por otra parte, la ocurrencia de fusiones en tandem, que alteran el NF cinco flechas diagonales principales en la Fig.

Por otra parte, Euneomys chinchilloides y Loxodontomys pikumche , habitantes de Chile central que tienen cariotipos derivados, y P.

Agradecemos a la Dra. Bulletin of the American Museum of Natural History Mammalian Chromosome Newsletter Chromosoma Berlin Fieldiana Zoology Cytogenetics and Cell Genetics Sinauer Associates, Sunderland, Massachusetts. Comparative Biochemistry and Physiology 56A: American Museum Novitates Journal of Mammalogy Revista Chilena de Historia Natural Science Archives de Biologie Bruxelles Variation in the old-field Peromyscus polionotus.

Biological Journal of the Linnean Society Journal of Mammalian Evolution 6: Nucleic Acids Research Hereditas Genetica Godoy-Herrera y G. Gajardo Recibido el 5 de abril de ; aceptado el 18 de septiembre de It is stated whether specimens were used for chromosome analysis cro , protein lectrophoresis elec or cytochrome b gene sequencing citb. GenBank number U citb. GenBank number AF citb. Phyllotis amicus Pam : GenBank number U citb. Phyllotis andium Pan : GenBank number U GenBank number U Phyllotis limatus Pli : GenBank number U Phyllotis osilae Pos : GenBank number U Phyllotis wolffsohni Pwo : GenBank number U GenBank number AF Servicios Personalizados Revista.


2007, NĂºmero 6

Directory of Open Access Journals Sweden. It is presented the finding of an 18 q -monosomy inherited by maternal translocation 3q, 18 q in a 4-year-old boy with the typical clinical characteristics, that is, mental retardation and facial dysmorphia pattern. The phenotype-karyotype correlation and the pedigree were made. The patient's findings are compared with others reported in the medical literature, and the genetical interest of the clinical and cytogenetic study of the parents is emphasized. The clinical manifestations are compatible with the 18 q - syndrome.


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