Despite recent advances in human genetic research, predicting and treating psychological disorders through genetic means remains largely theoretical. Currently, the U.S. Department of Energy (DOE) and National Institutes of Health's Human Genome Project hopes to complete a detailed "road map" of the human genome by 2003, and a nearly complete working draft is scheduled for publication in February 2001. "We're creating a resource that thousands of scientists can then use to do the research they want to do," says Daniel Drell, Ph.D., of the DOE Office of Biological and Environmental Research.
Approximately 100 genes are currently used for diagnosis, but the human genome has an estimated 50,000 to 100,000 genes. While some genes have been known for 40 years, others connected to diseases like Alzheimer's were only recently discovered and so are more controversial. For example, every human has ApoE, the so-called Alzheimer's gene. Only when there is a particular abnormality within that gene does the possibility of developing the disease exist.