Three years ago, as part of a personal project to assess his family's risk of developing Alzheimer's disease, Dr. Fallon collected brain scans and DNA samples from himself and seven relatives.
Dr. Fallon looked at about 20 genetic markers linked directly or indirectly to aggression, including compulsive behavior and mood. One marker, which has become a big target for research, is MAOA, or the "warrior gene."
To his surprise, Dr. Fallon found that the analysis of his own brain showed he had inherited certain high-risk forms of MAOA and other various aggression-and violence-related genes.
"I'm the one who looks most like a serial killer," he says. "It's disturbing." [Link, via Genealogy Reviews Online]