External Characters and Karyotypes of the Captive Tamaraws, Bubalus (B.) mindorensis, at the Gene Pool in the Island of Mindoro, Philippines

Namikawa, Takao; Masangkay, Joseph S.; Maeda, Kei‐ichiro; Escalada, Roberto F.; Hirunagi, Kanjyun; Momongan, V. G.

doi:10.5924/abgri1993.23.19

Cited by 6 publications

References 5 publications

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Phylogenetic relationship among all living species of the genusBubalus based on DNA sequences of the cytochromeb gene

et al. 1996

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The cytochrome b genes of all living species of Bubalus, including the river type and the swamp type of domestic buffaloes (Bubalus bubalis), were sequenced to clarify their phylogenetic relationships. These sequences were compared together with the African buffalo (Syncerus caffer) and banteng (Bos javanicus) sequences as an outgroup. Phylogenetic trees of Bubalus species based on the DNA sequences of the cytochrome b gene demonstrated that the tamaraw (Bubalus mindorensis), endemic to the Philippines, could be classified into the subgenus Bubalus, not the subgenus Anoa. The divergence time between the lowland anoa (B. depressicornis) and the mountain anoa (B. quarlesi) was estimated at approximately 2.0 million years (Myr), which is almost the same as the coalescence time for the Bubalus sequences. This large genetic distance supports the idea that the lowland anoa and the mountain anoa are different species. An unexpectedly large genetic distance between the river and the swamp type of domestic buffaloes suggests a divergence time of about 1.7 Myr, while the swamp type was noticed to have the closest relationship with the tamaraw (1.5 Myr). This result implies that the two types of domestic buffaloes have differentiated at the full species level.

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Phylogenetic relationship among all living species of the genusBubalus based on DNA sequences of the cytochromeb gene

et al. 1996

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Tamaraw Bubalus mindorensis Heude, 1888

Cebrian¹,

Boyles²,

Leon³

et al. 2014

Ecology, Evolution and Behaviour of Wild Cattle

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Cytogenetic analysis of the tamaraw Bubalus mindorensis): a comparison of R-banded karyotype and chromosomal distribution of centromeric satellite DNAs, telomeric sequence, and 18S-28S rRNA genes with domestic water buffaloes

Tanaka

Matsuda²,

Masangkay³

et al. 2000

Journal of Heredity

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The karyotype of the tamaraw (Bubalus mindorensis, 2n = 46) was investigated by RBG-banding technique and compared with those of the river and the swamp cytotypes of domestic water buffalo (B. bubalis). The tamaraw karyotype consisted of 6 submetacentric and 16 acrocentric autosome pairs (NAA = 56), and X and Y chromosomes. The RBG-banded karyotype of the three taxa had a high degree of homology, and the tamaraw karyotype could be explained by a Robertsonian translocation between chromosomes 7 and 15 and by a telomere-centromere tandem fusion between chromosomes 4p and 12 of the standardized river buffalo cytotype (2n = 50, NAA = 58). The buffalo satellite I and II DNAs were localized to the centromeric regions of all the tamaraw chromosomes. The biarmed chromosome 2 of the tamaraw resulting from the fusion between chromosomes 7 and 15 of the standard contained much larger amounts of the satellite I DNA than the other biarmed chromosomes, suggesting that this chromosome was formed by a relatively recent Robertsonian fusion. The (TTAGGG)n telomeric sequence was specifically localized to the telomeric region of all the buffalo chromosomes. The 18S + 28S rDNA was localized to the telomeric regions of the chromosomes 5p, 7, 19, 21, and 22 of the tamaraw and of their homologous chromosomes in the river and swamp buffalo cytotypes.

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External Characters and Karyotypes of the Captive Tamaraws, Bubalus (B.) mindorensis, at the Gene Pool in the Island of Mindoro, Philippines

Cited by 6 publications

References 5 publications

Phylogenetic relationship among all living species of the genusBubalus based on DNA sequences of the cytochromeb gene

Phylogenetic relationship among all living species of the genusBubalus based on DNA sequences of the cytochromeb gene

Tamaraw Bubalus mindorensis Heude, 1888

Cytogenetic analysis of the tamaraw Bubalus mindorensis): a comparison of R-banded karyotype and chromosomal distribution of centromeric satellite DNAs, telomeric sequence, and 18S-28S rRNA genes with domestic water buffaloes

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