I read recently that DNA transcription for protein expression is able to identify and skip an inserted element, but that the protein will be slightly different

I read recently that DNA transcription for protein expression is able to identify and skip an inserted element, but that the protein will be slightly different at the boundaries. It appears to have gone badly wrong for the "Tasmanian Devil." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4802805/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4802805/ https://www.science.org/content/article/origin-tasmanian-devil-tumors-identified https://www.science.org/content/article/origin-tasmanian-dev...