Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados Biol. Res. (3) Autor Berríos,Soledad (3) Ayarza,Eliana (2) Fernández-Donoso,Raúl (2) López-Fenner,Julio (2) Manterola,Marcia (2) Page,Jesús (2) Fernández–Donoso,Raúl (1) González,Marisel (1) Manieu,Catalina (1) Prieto,Zulita (1) Mais... Palavra-chave Mouse spermatocytes (3) Bivalent associations (2) Nuclear architecture (2) Robertsonian chromosomes (2) Heterochromatin distribution (1) Nuclear model (1) Nucleoli (1) Quadrivalents (1) Mais... Tipo do documento Journal article (3) Ano 2017 (1) 2014 (1) 2010 (1) País Chile (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Robertsonian chromosomes and the nuclear architecture of mouse meiotic prophase spermatocytes Biol. Res. Berríos,Soledad; Manieu,Catalina; López-Fenner,Julio; Ayarza,Eliana; Page,Jesús; González,Marisel; Manterola,Marcia; Fernández-Donoso,Raúl. BACKGROUND: The nuclear architecture of meiotic prophase spermatocytes is based on higher-order patterns of spatial associations among chromosomal domains from different bivalents. The meiotic nuclear architecture depends on the chromosome characteristics and consequently is prone to modification by chromosomal rearrangements. In this work, we consider Mus domesticus spermatocytes with diploid chromosome number 2n = 40, all telocentric, and investigate a possible modification of the ancestral nuclear architecture due to the emergence of derived Rb chromosomes, which may be present in the homozygous or heterozygous condition. RESULTS: In the 2n = 40 spermatocyte nuclei random associations mediated by pericentromeric heterochromatin among the 19 telocentric... Tipo: Journal article Palavras-chave: Robertsonian chromosomes; Mouse spermatocytes; Bivalent associations; Nuclear architecture. Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100016 Synaptic configuration of quadrivalents and their association with the XY bivalent in spermatocytes of Robertsonian heterozygotes of Mus domesticus Biol. Res. Berríos,Soledad; Fernández–Donoso,Raúl; Ayarza,Eliana. Abstract Background The nuclear architecture of meiotic prophase spermatocytes is based on higher–order patterns of spatial associations among chromosomal domains and consequently is prone to modification by chromosomal rearrangements. We have shown that nuclear architecture is modified in spermatocytes of Robertsonian (Rb) homozygotes of Mus domesticus. In this study we analyse the synaptic configuration of the quadrivalents formed in the meiotic pro– phase of spermatocytes of mice double heterozygotes for the dependent Rb chromosomes: Rbs 11.16 and 16.17. Results Electron microscope spreads of 60 pachytene spermatocytes from four animals of Mus domesticus 2n = 38 were studied and their respective quadrivalents analysed in detail.... Tipo: Journal article Palavras-chave: Quadrivalents; Robertsonian chromosomes; Mouse spermatocytes; Nucleoli; Nuclear architecture. Ano: 2017 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100405 Model of chromosome associations in Mus domesticus spermatocytes Biol. Res. Berríos,Soledad; Manterola,Marcia; Prieto,Zulita; López-Fenner,Julio; Page,Jesús; Fernández-Donoso,Raúl. Understanding the spatial organization of the chromosomes in meiotic nuclei is crucial to our knowledge of the genome's functional regulation, stability and evolution. This study examined the nuclear architecture of Mus domesticus 2n=40 pachytene spermatocytes, analyzing the associations among autosomal bivalents via their Centromere Telomere Complexes (CTC). The study developed a nuclear model in which each CTC was represented as a 3D computer object. The probability of a given combination of associations among CTC was estimated by simulating a random distribution of 19 indistinguishable CTC over n indistinguishable "cells" on the nuclear envelope. The estimated association frequencies resulting from this numerical approach were similar to those obtained... Tipo: Journal article Palavras-chave: Bivalent associations; Nuclear model; Mouse spermatocytes; Heterochromatin distribution. Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300003 Registros recuperados: 3 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco