The acting gene?

I was speaking to my mother yesterday, telling her how much I missed acting and being on the stage and she wondered where I got my talent for acting. Her (flattering) words, even though she very rarely saw me on stage and I think the last time she heard me acting was for that radio play two years ago. She told me that she was terribly shy as a child and that for a school play she had ran away from the stage. I am terribly shy too and I remember my first performance at uni: my legs were shaking, I thought I would collapse on the stage. It did not happen though, and I carried through the role. It was only a few lines: I was playing Purgon in Le malade imaginaire. But the lecturer and stage director had told me after the very first rehearsal that I was a natural. When I took acting classes later, I learned that being a natural means very little: you need to develop your talent if you want it to become a craft. Something I have never done enough. Nevertheless, I do think I have at least some talent, some natural skill for acting. And I wonder where I got it from.