[The Unitary Psychosis Theory]

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• Historical attempts to classify mental illnesses, such as schizophrenia and bipolar disorder, have led to systems like the DSM-5.
• The emergence of neurosyphilis-related psychosis cases highlights limitations in current categorical frameworks.
• Recent research indicates shared genetic underpinnings across diverse psychiatric conditions.

Purpose of the Study:

• To challenge the traditional categorical approach to mental illness classification.
• To advocate for a paradigm shift towards a spectrum-based model for psychiatric diagnosis.
• To integrate genetic findings into the understanding of mental health disorders.

Main Methods:

• Review of historical classification systems in psychiatry.
• Analysis of published genetic studies linking specific genes to multiple psychiatric disorders.
• Comparative analysis of categorical versus dimensional diagnostic approaches.

Main Results:

• A growing body of evidence demonstrates shared genetic risk factors among intellectual disability, autism, ADHD, schizophrenia, bipolar disorder, and depression.
• The concept of distinct, heterogeneous diseases for these conditions is increasingly challenged by genetic data.
• Categorical classifications may oversimplify the complex etiology and presentation of mental health conditions.

Conclusions:

• The current categorical diagnostic system may not adequately capture the nuanced nature of mental illness.
• A spectrum model, supported by genetic research, offers a more integrated and potentially accurate framework for understanding psychiatric disorders.
• Future diagnostic criteria should prioritize a dimensional, spectrum-based approach to better reflect biological and clinical realities.