# Condensatopathies as a mechanistic framework for disease and integrated theranostic intervention

## TL;DR

This paper introduces 'Condensatopathies' as a new framework for understanding diseases caused by disruptions in cellular condensates and proposes a new approach for diagnosis and treatment.

## Contribution

The paper introduces a novel classification framework for diseases based on biomolecular condensate dysregulation and proposes a new theranostic paradigm.

## Key findings

- Condensatopathies are classified based on genetic/environmental triggers, biophysical defects, and causal toxicity.
- Two mechanisms underpin these diseases: Loss-of-Function and Toxic Gain-of-Function.
- Emerging technologies like optogenetics and cryo-ET are helping decode these disease mechanisms.

## Abstract

The spatial organization of the cell relies on biomolecular condensates formed via liquid-liquid phase separation (LLPS). The dysregulation of this physicochemical order drives a growing class of human pathologies. Here, we champion the unifying term "Condensatopathies" and establish a rigorous framework for their classification based on three core criteria: genetic/environmental triggers, demonstrable biophysical defects, and causal toxicity. We synthesize the pathogenic landscape into two distinct yet interconnected mechanisms: Loss-of-Function (LOF), where essential condensates fail to form or harden; and Toxic Gain-of-Function (TGOF), characterized by the formation of aberrant, often solid-like aggregates or oncogenic hubs that hijack cellular machinery. By analyzing representative cases—from the biophysical maturation of TDP-43 in neurodegeneration to the chromatin hijacking by NUP98 fusions in leukemia—we reveal how the loss of "tunable metastability" underpins these disorders. Furthermore, we review how emerging technologies like optogenetics and cryo-ET are decoding these mechanisms. Finally, we propose an integrated "See-and-Treat" theranostic paradigm, utilizing the unique material properties of condensates to design specific diagnostic probes and "molecular scalpels" for precision intervention.