Doesn't the very fact that we have a genetic profile here for depression suggest this?
As far as I know there hasn't been found any biomedical or genetic markers for any psychiatric condition, except for those that have a known neurological pathomechanism like for example viral brain inflammation and many more.
One of the leading neuroscientists of this field has stated a couple of years ago that the many billions that were spent into this endeavour over the past fifty years were a great waste of time and resources.
In the meantime the number of chronic psych patients on disability have been mounting every decade – just as the number of drugs they are on – while the average life expectancy has fallen steadily.
The biomedicalisation of psychiatry has already proven itself to be just as detrimental for patients as have all the other models that came before it.
I encourage everyone to do some reading on the current and factual state of psychiatry and its history instead of just reproducing the dogma du jour.
The books by Joanna Moncrieff who has published on the pharmacologisation of psychiatry over the past decades extensively and has debunked the serotonin hypothesis of depression is a good start.
For schizophrenia recovery for example the science is crystal clear from a massive long term study that was done by the WHO 15 years ago. The smaller your chance at falling into the hands of a psychiatrist – because you live in a very poor country – the less likly your risk of chronification and the higher your chance that you will experience full remission and be back to a normal life and functioning after a couple of years.
Research into the mental health of US military veterans show the same patterns. Suicidality sky rockets for those who go see psychiatrists compared to controls.
This and many more interesting questions are discussed on the Mad in America website. I will link the sources if anyone's interested.