By Gil Press

In the Wall Street Journal today, Shirley S. Wang reports on a new study published today in The Lancet, which “provides early evidence that several disorders  thought to be distinct appear to have some genetic overlap, and it may help in one day diagnosing mental illness based on faulty biological processes, and not just on behavioral symptoms.”

The study compared the genes of some 33,000 people with schizophrenia, bipolar disorder, major depression, autism or attention-deficit hyperactivity disorder, and also compared them with a group of nearly 28,000 controls. It “identified several regions of the genome that were associated with all five diseases.”

In Mind, Modernity, Madness, Liah Greenfeld came to a similar conclusion that viewing manic-depressive illness and schizophrenia as distinct illnesses, each with its own biological causes, is wrong. Instead, she argues that they should be placed on a continuum of the complexity of the will-impairment caused by the anomie inherent in modern culture. This argument, linking mental illness to individuals’ (varied) response to the pressures of modern society, could also explain why “the findings don’t mean that an individual with one or more of these gene variants has or will develop the condition,” as the Wall Street Journal article–and the authors of the study–conclude.