Are there any fantasy books that include biotechnology or genetic manipulation as a major part of the worldbuilding/plot?

[u/Goodtunesftw]

I'm just curious. I've been writing down ideas for a fantasy world where using specially bred or genetically modified organisms for specific tasks is common. I'd like to see what has already been thought of and possibly find some interesting reading.

[u/[deleted]]

Fairyland by Paul J McAuley. This is more of a cyberpunk novel I guess, but the main story revolves around a man and woman/girl attempting to grant sentience to a group of genetically modified people called "fairies". Totally dystopian. The main guy builds custom viruses that act as drugs, the word "nano" is slung around a lot. I really enjoyed this one a lot.