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Mitochondrial control region genetic diversity and maternal ancestry of a Brangus-Ibage cattle populations

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Mitochondrial control region genetic diversity and maternal ancestry of a Brangus-Ibage cattle populations

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Título Mitochondrial control region genetic diversity and maternal ancestry of a Brangus-Ibage cattle populations
Autor Henkes, Luiz Ernani
Silva Junior, Wilson Araujo da
Moraes, José Carlos Ferrugem de
Weimer, Tania de Azevedo
Abstract 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.
Contido em Genetics and molecular biology. Ribeirão Preto. Vol. 28, no. 1 (Mar. 2005), p. 60-66
Assunto Bovino
Diversidade genética
[en] Beef cattle
[en] Bovine mtDNA
[en] Genetic diversity
[en] Maternal lineage
[en] Sequence analysis
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/23373
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