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The Journal of Heredity 2002:93(5)
© 2002 The American Genetic Association 93:323-330

African-Derived Mitochondria in South American Native Cattle Breeds (Bos taurus): Evidence of a New Taurine Mitochondrial Lineage

M. M. Miretti, H. A. Pereira, Jr., M. A. Poli, E. P. B. Contel, and J. A. Ferro

From the Departmento de Tecnologia, FCAV, UNESP, Via de Acesso Prof. P. D. Castellane km 5, 14884-900 Jaboticabal, SP, Brazil (Miretti, Ferro, and Pereira); Departmento de Genética, FMRP, USP, Av. Bandeirantes 3900, 14049-900, Ribeirão Preto, SP, Brazil (Miretti and Contel); and Instituto de Genética, CNIA-INTA, Castelar, Argentina (Poli).

Address correspondence to M. M. Miretti at the address above, or e-mail: jesus{at}fcav.unesp.br.

This article reports the nucleotide diversity within the control region of 42 mitochondrial chromosomes belonging to five South American native cattle breeds (Bos taurus). Analysis of these data in conjunction with B. taurus and B. indicus sequences from Africa, Europe, the Near East, India, and Japan allowed the recognition of eight new mitochondrial haplotypes and their relative positions in a phylogenetic network. The structure of genetic variation among different hypothetical groupings was tested through the molecular variance decomposition, which was best explained by haplotype group components. Haplotypes surveyed were classified as European-related and African-related. Unexpectedly, two haplotypes within the African cluster were more divergent from the African consensus than the latter from the European consensus. A neighbor-joining tree shows the position of two haplotypes compared to European/African mitochondrial lineage splitting. This different and putatively ancestral mitochondrial lineage (AA) is supported by the calibration of sequence divergence based on the Bos–Bison separation. The European/African mitochondria divergence might be subsequent (67,100 years before present) to that between AA and Africans (84,700 years before present), also preceding domestication times. These genetic data could reflect the haplotype distribution of Iberian cattle five centuries ago.


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