This article is quite good. It describes a large study that seems to show fairly conclusively that five of our most important psychological disorders have a close genetic foundation. The five disorders are autism, ADHD, bipolar disorder, depression, and schizophrenia.
This supports the model that nature (genes) when stressed (nurture) can lead to a variety of psychological disorders, which when diagnosed by behavioral manifestations alone may seem to be very different.
In my view, a major psychological stressor that affects virtually all people is the low resolution of the language of interpersonal communication. In sensitive individuals, this stressor can and often does lead to psychological problems.
By “low resolution,” I mean that our language (gesture, symbols, words, semiotics) of interpersonal communication is crude compared to what our brains/minds are capable of. The crude nature of this language forces us to blur subtleties in communication, and this leads to confusion and dissatisfaction, which in turn may manifest as a psychological disorder.
No doubt, some instances of the five disorders described have a strong genetic foundation making them all but inevitable. But all things human can be understood as lying on a spectrum of varying degrees. Thus, most human beings at one time or another will experience aspects of one or more of these disorders due to problems in their interpersonal communications.
Edit. Here is another article on this subject: Same Genetic Basis Found in 5 Types of Mental Disorders.