You sure?
"The study does not show which came first -- the loneliness or the physical traits. But it does suggest there may be a way to help prevent the deadly effects of loneliness"
"What this study shows is that the biological impact of social isolation reaches down into some of our most basic internal processes -- the activity of our genes," Cole said.
"The findings suggest that the loneliest people had unhealthy levels of chronic inflammation, which has been associated with heart and artery disease, arthritis, Alzheimer's and other ills.
The next step is to see if this might be treated, Cole said."
I don't see where anything at all anywhere in the article says that loneliness is caused by genetics. It says quite the opposite.