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Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204X

Abstract

ANUNCIACAO, CARLOS EDUARDO  and  ASTOLFI-FILHO, SPARTACO. Paternity test in "Mangalarga-Marchador" equines by DNA-fingerprinting. Pesq. agropec. bras. [online]. 2000, vol.35, n.10, pp. 2007-2015. ISSN 0100-204X.  http://dx.doi.org/10.1590/S0100-204X2000001000012.

GC-rich molecular minisatellite probes isolated from the human genome have presented a poor ability for individualization in horses. In this study new DNA sequences were isolated which could be used in paternity tests in horses. Genomic DNA from "Mangalarga-Marchador" horses was treated with restriction enzymes that preferentially digest non-repetitive sequences, so preserving the structure where mini and microsatellites are located. Four clones (S01, S05, S07 and S09) selected from a genomic library screened with a (TG)n oligonucleotide showed similar hybridization profiles generating bands of DNA-fingerprinting type. Using these probes the individualization power obtained was 10-8, which is 105fold higher than that obtained with M13, another GC-rich type probe. All clones were efficient in parentage detection in crossbreedings and presented a 27 bp consensus sequence, GTTTCATTTATTATTCTTTGGAAGAAA, which was repeated 12, 18, 11 and 21 times in clones S01, S05, S07 and S09, respectively.

Keywords : breeding methods; molecular cloning; progeny testing; horses; identification; genetic polymorphism.

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