Centric fusion in goats (Capra hircus): Identification of a 6/15 translocation by high resolution chromosome banding
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Data
1998-03-01
Autores
Mota, Lígia Souza Lima Silveira da [UNESP]
Silva, Rosana Ap. Bicudo da [UNESP]
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Sociedade Brasileira de Genética
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Foram analisados citogeneticamente 9 caprinos (6 machos e 3 fêmeas) da raça Saanen, fenotipicamente normais, pertencentes ao capril do Instituto de Biociências, UNESP, campus de Botucatu. Objetivou-se, utilizando como padrão cromossômico o descrito em ISCNDA (1989), confirmar ou não o envolvimento dos cromossomos 5 e 15 na translocação Robertsoniana anteriormente observada em uma amostra do rebanho brasileiro. Os resultados sugerem o envolvimento dos cromossomos 6 e 15 na fusão analisada em células prometafásicas em bandamento G. A amostra brasileira de animais portadores de rearranjos estruturais não apresentou qualquer redução na fertilidade, sugerindo a existência de seleção pré-zigótica contra gametas não balanceados. A avaliação da real incidência das translocações Robertsonianas e seus efeitos no desempenho reprodutivo somente será possível com a ampliação das investigações no rebanho brasileiro.
Nine phenotypically normal Saanen goats (6 males and 3 females) belonging to the goat house of the Instituto de Biociências, UNESP, Botucatu Campus, were analyzed cytogenetically. The objective of the present study was to determine whether or not chromosomes 5 and 15 are involved in a Robertsonian translocation previously observed in a sample of a Brazilian herd using the chromosome pattern described by the ISCNDA (1989). The results suggest the involvement of chromosomes 6 and 15 in the fusion demonstrated by G-banding in prometaphase cells. The Brazilian sample of animals carrying structural rearrangements did not present any reduction in fertility, suggesting the existence of prezygotic selection against unbalanced gametes. Further investigations on the Brazilian herd are necessary to assess the real incidence of Robertsonian translocations and their effects on reproductive performance.
Nine phenotypically normal Saanen goats (6 males and 3 females) belonging to the goat house of the Instituto de Biociências, UNESP, Botucatu Campus, were analyzed cytogenetically. The objective of the present study was to determine whether or not chromosomes 5 and 15 are involved in a Robertsonian translocation previously observed in a sample of a Brazilian herd using the chromosome pattern described by the ISCNDA (1989). The results suggest the involvement of chromosomes 6 and 15 in the fusion demonstrated by G-banding in prometaphase cells. The Brazilian sample of animals carrying structural rearrangements did not present any reduction in fertility, suggesting the existence of prezygotic selection against unbalanced gametes. Further investigations on the Brazilian herd are necessary to assess the real incidence of Robertsonian translocations and their effects on reproductive performance.
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Genetics and Molecular Biology. Sociedade Brasileira de Genética, v. 21, n. 1, p. -, 1998.