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CAMBRIDGE – For the first time, researchers at the University of Cambridge have identified a biomarker for major or clinical depression in human saliva. An examination of saliva samples of hundreds of teenagers revealed that boys especially may be at the greatest risk of depression.
Following a group of boys and girls over 12 to 36 months by measuring levels of cortisol in their saliva, as well as collecting self-reported information on symptoms of depression, the researchers found that boys with depressive symptoms and elevated morning cortisol were 14 times more likely to develop clinical depression compared with boys with neither.
However, the connection was not as distinctive in female participants. Girls with high cortisol and depressive symptoms were four times more likely to develop depression, suggesting differences between the sexes in how depression develops.
Clinical depression is a severe and common illness, affecting one in six people at some point in their lives, according to the researchers. To date, however, scientists have lacked validated biomarkers for the condition in the youth population at large to aid the detection of at-risk groups for depression in general and in boys and young men in particular, partly owing to its various causes and symptoms.
“Through our research, we now have a very real way of identifying those teenage boys most likely to develop clinical depression,” said Prof. Ian Goodyer from the university’s Department of Psychiatry. “This will help us strategically target preventions and interventions at these individuals and hopefully help reduce their risk of serious episodes of depression and their consequences in adult life.”
The study, titled “Elevated morning cortisol is a stratified population-level biomarker for major depression in boys only with high depressive symptoms”, was published on 18 February in the Proceedings of the National Academy of Sciences of the United States of America journal.
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