I think about this alot, and really, I don't know the answer but I would lean towards yes. I come from a family of 6 kids. Out of all of us, I know my brother has similar symptoms but I'm not sure if it is as bad for him.
I think about:
1. Why did the rest of my sisters (with the exception of my brother) turn out ok, and I'm the only f*cked up one? (now we all have problems. But I mean this problem in particular)
2. I blame my mother alot, and I guess my father too because he wasn't really 'there' emotionally.. neither was my mother.. but I think if she would have gotten help for me when I got really depressed in high school, then maybe I would have been ok. Or maybe they just could have been there more for me.. but I guess parents learn how to be a parent by how they were raised, and maybe my grandmother was the same way wth my mother. So I guess in that sense I can't really blame her, but at least with my daughter I will sure as hell make sure she doesn't have to go through what I went through. I will look for signs and make sure she is ok.
3. If it is genetic (which I don't know), then it couldn't really have been 'prevented' but I could have at least gotten help for it. To give my parents credit, I guess not alot of people really know about this disorder and I'm sure when I was growing up there was less information then there is now, so maybe they just didn't know what to do. I really don't know.