Abstract
Cleavage patterns of mitochondrial DNA (mtDNA) by restriction endonuclease analysis were examined in four Japanese Black cows, three Japanese Shorthorn cows, and six Holstein cows. Seventeen restriction enzymes which recognize six base pairs and two restriction enzymes which recognize four base pairs were used in this study. Polymorphism was observed with three restriction enzymes, HindIII, TaqI, and MspI, and was detected within the breeds. Nucleotide substitution was determined in the HindIII polymorphic site by DNA cloning and sequencing; this is C----T at position 10126 of the URF-3 region. Furthermore, the MspI and TaqI polymorphic sites were located on the physical map.
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