I just published this article a few days ago (link below) and I remembered your comment. In brief, after having written the new article, I think we can still be confident about mRNA vaccine's long-term safety for many reasons. If you are still interested, feel free to read it and share your thoughts if any.

https://medium.com/microbial-instincts/are-we-really-sure-of-the-mrna-vaccines-long-term-safety-27b6639c9de1?sk=a6e9e44629e66068ddfba345dd554f3a

Thanks for referring me to those two papers as well. However, the current article is about mRNA vaccine, not DNA vaccine. And I'm aware that DNA vaccine biodistribution is another topic entirely.