Which one of the following conclusions is not supported by current biological research on schizophrenia today?

The prevailing conclusion in current biological research on schizophrenia today is that the disorder has a strong genetic component. However, there is still ongoing research and debate on the exact mechanisms and risk factors involved in the development of schizophrenia. One conclusion that is not supported by current biological research on schizophrenia is that it is caused by a single gene or genetic mutation. Instead, it is understood to be a complex disorder influenced by multiple genetic variations and interactions with environmental factors.