Explain the stress-diathesis model of mental illness?

DIATHESIS-STRESS MODEL - Psychology Dictionary
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Claims of the Diathesis Stress Model of Schizophrenia

A few years later Caspi et al. (2005) took this genetic approach and assessed the catechol-O-methyltransferase (COMT) gene. Their rationale for this is that COMT is involved in the metabolism of dopamine in the prefrontal cortex and dopaminergic deregulation is thought to play a role in the pathogenesis of schizophrenia. The authors concluded that the link between cannabis and psychosis was moderated by a COMT gene polymorphism. That is, cannabis users in their teen years who carried the COMPT valine allele were the most likely to develop psychotic symptoms. On the other hand, teens with two copies of the methionine allele did not present this risk even when using cannabis. This study presented some strong evidence for the stress diathesis model of cannabis and psychosis.

Biological Explanations of OCD There should be no surprises here
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Family Dysfunction as an explanation of Schizophrenia ..

There is also strong evidence to support the claim that cannabis use exacerbates the symptoms of schizophrenia and other psychosis-related illnesses (though paradoxically it can also temporarily relieve symptoms see vulnerability hypothesis section). This is supported both by retrospective and prospective studies which control for confounding variables as well as biological facts which link the dopamine neurotransmitter system with psychotic disorders (Adams & Martin, 1996). Crudely put, psychosis, from a biological/neurological perspective, involves disturbances in the dopamine system. Drugs given to individuals to reduce psychotic symptoms reduce dopamine levels in the brain while other drugs, such as cannabis increase dopamine levels in the brain. More specifically , such as (THC) increases dopamine release in the brain. This relates to the often cited and while the jury is still out regarding the precise role of dopamine in the illness, it is quite clear that is does somehow factor into the manifestation of psychotic symptoms.

Refer to your text for current explanations for the causes and biochemical origins of schizophrenia
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Mental illness is often by the stress diathesis model. This model understands behaviours and illnesses and in this case, psychosis-related illnesses, as being a product of the interaction between

in the medical field and is often applied to mental disorders is the diathesis-stress model
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