I'm confused with this explanation in my book: 2-aminopurine is incorporated into DNA in place of adenine but can pair with cytosine, so an AT pair becomes a CG pair.
This sentence seems odd to me. It says that adenine is replaced with 2-aminopurine, but can pair with cytosine. And the AT pair turns to CG pair. Does it mean that 2-aminopurine substitute adenine, and then it works like cytosine to bind with guanine?? Because 'AT pair becomes CG'. But it says 'but can pair with cytosine', which one is going to bind with cytosine??
I've Googled on this but couldn't reach to a clear explanation about this. Can someone please explain to me how this analog works or rephrase the sentence in my book? Thank you.
The book that I'm referring is Microbiology: an introduction 10th ed. By tortora, funke and case. Page 229.