Mapeamento RH comparativo do cromossomo X de búfalo de rio (Bubalus bubalis) / Patrícia Ianella
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Data
2008-04-28
Autores
Ianella, Patrícia [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O cromossomo X apresenta conteúdo conservado entre as diferentes espécies de mamíferos. No de búfalo de rio (Bubalus bubalis), espécie que vem ganhando interesse econômico no Brasil e no mundo, sua morfologia é acrocêntrica. No presente trabalho, apresentamos o primeiro mapa RH do cromossomo X bubalino gerado a partir do recentemente construído painel de células híbridas irradiadas búfalo-roedor (BBURH5000). Este mapa contém um total de 33 marcadores derivados de bovino, incluindo dez genes, quatro ESTs e 19 microssatélites. Estes marcadores estão distribuídos em dois grupos de ligação: LG1 com oito marcadores e abrangendo 125.6 cR, e o LG2 com 25 marcadores abrangendo 366.3 cR. As freqüências de retenção (FR) dos marcadores variaram de 7,8% para o gene UREB1 a 28,9% para os microssatélites MAF45 e INRA30. O BBUXRH5000 foi comparado ao mapa de seqüência e mapa RH3000 do cromossomo X bovino evidenciando alguns poucos rearranjos entre as duas espécies, e alguns prováveis erros de mapeamento em uma das duas espécies quando comparado com BTAX build 3.1 bovino. A utilização de primers derivados de boi para mapeamento em búfalo foi realizada com êxito, e a distribuição dos marcadores ao longo do X considerada satisfatória, culminando em uma cobertura adequada para os primeiros esforços de mapeamento deste cromossomo. Análises comparativas do BBUX com o cromossomo X de outras espécies de mamíferos (humano, camundongo, ovelha, cavalo e cachorro) foram realizadas, revelando grande conservação de sintenia deste cromossomo na classe mamífera e, extensa conservação da ordem gênica entre búfalo e ovelha e búfalo e boi. O BBUXRH5000 aqui apresentado é um ponto de partida para a construção de mapas de alta resolução, necessários para caracterização de rearranjos que ocorreram durante a evolução e futuros estudos com o objetivo de dissecar características genéticas de interesse econômico.
The X chromosome shows conserved content among different mammalian species. In river buffalo (Bubalus bubalis), a brazilian and worldwide economic important specie, the X chromosome morphology is acrocentric. Here we report the first radiation hybrid map of the river buffalo X chromosome generated from a recently constructed river buffalo (Bubalus bubalis) whole-genome radiation hybrid panel (BBURH5000). This map contains a total of 33 cattle-derived markers, including ten genes, four ESTs and 19 microsatellites. The markers are distributed in two linkage groups: LG1 contains eight markers spanning 125.6 cR, and LG2 contains 25 markers spanning 366.3 cR. The retention frequency (RF) of individual markers across the panel ranged from 7.8% to the gene UREB1 and 28,9 to the microsatellites MAF45 and INRA30. The BBUXRH5000 was compared with the bovine sequence assembly (build 3.1) and RH3000 bovine X chromosome maps and showed few rearrangements between these species, and possible mapping errors in one of the two species when compared with BTAX build 3.1. The use of cattle-derived primers using carried out successfully and the markers distribution along the chromosome was satisfactory, resulting in adequate coverage for a first mapping effort of this chromosome. Comparative analysis between BBUX and X chromosome from other mammalian species (human, hamster, sheep, horse and dog) were carried out showed extensive sinteny conservation of the X chromosome in the Mammalian Class, and gene order conservation between river buffalo and sheep and river buffalo and cattle. The BBUXRH5000 here presented is the start-pointing for the construction of high-resolution map, which is necessary for characterization of rearrangements occurring during evolution and futures studies in order to dissect economically important traits.
The X chromosome shows conserved content among different mammalian species. In river buffalo (Bubalus bubalis), a brazilian and worldwide economic important specie, the X chromosome morphology is acrocentric. Here we report the first radiation hybrid map of the river buffalo X chromosome generated from a recently constructed river buffalo (Bubalus bubalis) whole-genome radiation hybrid panel (BBURH5000). This map contains a total of 33 cattle-derived markers, including ten genes, four ESTs and 19 microsatellites. The markers are distributed in two linkage groups: LG1 contains eight markers spanning 125.6 cR, and LG2 contains 25 markers spanning 366.3 cR. The retention frequency (RF) of individual markers across the panel ranged from 7.8% to the gene UREB1 and 28,9 to the microsatellites MAF45 and INRA30. The BBUXRH5000 was compared with the bovine sequence assembly (build 3.1) and RH3000 bovine X chromosome maps and showed few rearrangements between these species, and possible mapping errors in one of the two species when compared with BTAX build 3.1. The use of cattle-derived primers using carried out successfully and the markers distribution along the chromosome was satisfactory, resulting in adequate coverage for a first mapping effort of this chromosome. Comparative analysis between BBUX and X chromosome from other mammalian species (human, hamster, sheep, horse and dog) were carried out showed extensive sinteny conservation of the X chromosome in the Mammalian Class, and gene order conservation between river buffalo and sheep and river buffalo and cattle. The BBUXRH5000 here presented is the start-pointing for the construction of high-resolution map, which is necessary for characterization of rearrangements occurring during evolution and futures studies in order to dissect economically important traits.
Descrição
Palavras-chave
River buffalo, BBUX, RH mapping, Genetica animal, Mapeamento cromossômico, Cromossomo X, Búfalo de rio - Genética
Como citar
IANELLA, Patrícia. Mapeamento RH comparativo do cromossomo X de búfalo de rio (Bubalus bubalis) / Patrícia Ianella. 2008. 63 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Biociências, Letras e Ciências Exatas, 2008.