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Plasmids are an absolute doddle to work with. Borgs are huge, which makes them a nightmare to work with.

I used to work with bacterial artificial chromosomes (BACs) that were ~100 kb in size, and those were already a pain. You have to be really delicate when preparing the DNA because it's so easy to shear. You can't separate it on a normal gel, you have to use PFGE. Borgs will be even worse.

Borgs being bigger means you can fit more interesting stuff into them. But i don't know to what extent that is a constraint at the moment. 100 kb is already a lot of space for bacteria!

Bacteria and eukaryotes are different enough that we won't find borgs themselves in eukaryotes, and if you put a borg into a eukaryote, it wouldn't replicate. However, they could be used as a vector for constructing human artificial chromosomes - you need something that replicates in working organism, like bacteria or yeast, so you can do the molecular biology, and you add the necessary human sequences to that:

https://www.nature.com/articles/gt2009102

At the moment, the biggest vectors we have are yeast artificial chromosomes, which i think top out at ~1 Mb.

But again, what are you going to do that needs that much space? A typical human gene is a few tens of kb; 40 kb is big (there are megabase freaks, but they are very rare). And that's for the gene, introns and all - often you can use a cDNA which is a fraction of the size.




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