If that is the only SNP you are going to talk about then just say once that when you refer to "SNP" it is +3725 G/C. Otherwise 3 7 2 5 may be easy to say.

I agree with Ram and genomax. I remember one of my mentors calling a amino acid as "that chap" OR "this guy" while trying to make us understand the protein structures. That perfectly acceptable and yes also adds a pinch of humour.