Investigating Excitation/Inhibition Balance in Cortical-Thalamic Circuitry in CDKL5 Deficiency Disorder Using Human-Derived Assembloids
Awardee: Francesca Puppo
Institution: University of California, San Diego
Grant Amount: $61,007
Funding Period: February 1, 2025 - January 31, 2026
Summary:
This project focuses on CDKL5 Deficiency Disorder (CDD), a severe neurodevelopmental condition that causes drug-resistant epilepsy. In CDD, the balance between brain signals that excite and inhibit activity (called the excitation/inhibition or E/I balance) is disrupted, potentially leading to seizures. Cortical-thalamic projections have been implicated with the generation of seizures. However, traditional mouse models have not been able to effectively model the seizure phenotype in CDKL5 deficiency and study the complex interactions between thalamus and cortex. To address this, we will use advanced human-derived models called corticothalamic (CTh) assembloids, which combine brain-like structures (organoids) from patients with CDKL5 mutations. These models allow us to recreate the brain circuits involved in seizures and study how their development is altered. By using cutting-edge technologies such as high-density multi-electrode arrays, calcium imaging, and optogenetics, we can precisely investigate how disruptions in the E/I balance contribute to hyperexcitability in these circuits. Our research aims to identify the key mechanisms behind seizure generation in CDD, paving the way for potential therapies. This study directly supports ongoing efforts to improve CDD disease models and uncover new targets for treatment.