Because genetic and molecular epi are very big areas of research, there will be lots of exposure out there. I think the best way to get experience is actually working directly with faculty on projects, rather than learning through the classroom for these topics.
Looking through NIH grants and looking at the faculty publications is a good place to start. Also big schools (like Harvard or Hopkins) is also another place to begin because they have so many faculty, there's lots of work going on there with many difficult faculty.