Characterization of the adiponectin promoter + Cre recombinase insertion in the Tg(Adipoq-cre)1Evdr mouse by targeted locus amplification and droplet digital PCR.

The Tg(Adipoq-cre)1Evdr mouse has become an important tool in adipose tissue biology. However, the exact genomic transgene integration site has not been established. Using Targeted Locus Amplification (TLA) we found the transgene had integrated on mouse chromosome 9 between exons 6 and 7 of . We detected transgene-transgene fusion; therefore, we used droplet digital polymerase chain reaction to identify copy number. In two separate experiments, we digested with BAMHI and with HindIII to separate potentially conjoined sequences. We found one copy of intact present in each experiment, indicating transgene-transgene fusion in other parts of the BAC that would not contribute to tissue-specific expression. copy number for Tg(Adipoq-cre)1Evdr mice can be potentially used to identify homozygous mice.