Abstract
Two polymorphic mitochondrial DNA genomes, differing by a single Hpa II restriction site, are present at significantly different levels in tissue of three sibling dairy cows. The relative ratio of the two heteroplasmic molecules varies 3-fold among these three animals and documents a rapid segregation of mitochondrial genotypes in mammals. DNA sequencing shows the difference is due to a single guanine at position 364 in bovine mitochondrial DNA. A model involving unequal partitioning of the two amplified mitochondrial DNA species during the early cell divisions of the embryo can explain the appearance of such variation in heteroplasmic sibling animals. The model provides a basis for understanding the rapid DNA sequence variation observed in vertebrate mitochondrial DNA despite its high copy number and strict maternal inheritance.
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