Cats and dogs are very common animals in the human environment. In Switzerland, one in five households owns a cat or a dog. Their hairs are very easily transferred and could be used as a frequent trace evidence. Using DNA analysis, identification of these animals should be possible as it is in human identification. However, most of the time, no nuclear DNA can be recovered from the hair. It is therefore necessary to rely on mtDNA. Cats and dogs have tandemly repeated sequences in their mtDNA control region. In this study, the authors show that these tandem repeats are very polymorphic but are also the source of a very high level of heteroplasmy. The authors, therefore, examined if this might prevent their use in forensic identification.
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