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Provedor de dados:  Genet. Mol. Biol.
País:  Brazil
Título:  Mitochondrial control region genetic diversity and maternal ancestry of a Brangus-Ibage cattle populations
Autores:  Henkes,Luiz Ernani
Silva Jr,Wilson Araújo
Moraes,José Carlos Ferrugem
Weimer,Tania Azevedo
Data:  2005-03-01
Ano:  2005
Palavras-chave:  Bovine mtDNA
Maternal lineage
Sequence analysis
Beef cattle
Genetic diversity
Resumo:  The genetic diversity of 277 nucleotides in the mitochondrial DNA control region (nt 15,964 to 16,240 in reference sequence) was analyzed in crossbreed beef cattle (Brangus-Ibage, 5/8 Bos primigenius taurus x 3/8 Bos primigenius indicus) as well as in some Nellore samples (B. p. indicus). Fifty-seven mutations were found in Brangus-Ibage comprising 18 haplotypes (haplotype diversity, h = 0.851 ± 0.041 and nucleotide diversity, ntd = 0.009 ± 0.006) and 66 in Nellore (h = 1.00 ± 0.27, ntd = 0.014 ± 0.012). These data indicated sequence identities of 99.6 and 92.1% between the B. p. taurus' reference sequence and Brangus-Ibage and Nellore, respectively. The comparison of our data with sequence data for 612 individuals recovered from GenBank showed a total of 205 haplotypes defined by 99 polymorphic sites. Most of the variability (53%) was due to differentiation within breeds. The phylogenetic tree constructed using the neighbor-joining method showed clearly the well-known dichotomy between B. p. taurus and B. p. indicus. The Brangus-Ibage clustered with B. p. taurus lineages; however, the displacement of Nellore from B. p. indicus branch probably indicates a substantial B. p. taurus maternal ancestry in some Nellore samples (obtained from GenBank) and reflects the primarily male-driven introduction of this breed in Brazil.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Sociedade Brasileira de Genética
Relação:  10.1590/S1415-47572005000100011
Formato:  text/html
Fonte:  Genetics and Molecular Biology v.28 n.1 2005
Direitos:  info:eu-repo/semantics/openAccess

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