Tcf4 Deficiency causes recurrent seizures in mice

Area of Science:

• Neuroscience
• Genetics
• Developmental Biology

Background:

• Transcription factor 4 (TCF4) is crucial for central nervous system development.
• Haploinsufficiency of TCF4 causes Pitt-Hopkins Syndrome (PTHS), a neurodevelopmental disorder.
• Previous mouse models failed to replicate the seizure phenotype observed in PTHS patients.

Purpose of the Study:

• To develop a novel mouse model of Pitt-Hopkins Syndrome (PTHS) that exhibits seizures.
• To investigate the impact of TCF4 deletion in astrocytes on neurodevelopment and function.
• To provide a tool for studying PTHS pathogenesis and developing targeted therapies.

Main Methods:

• Generated a mouse model with heterozygous deletion of TCF4 in Aldh1l1-expressing cells (astrocytes).
• Assessed neurodevelopmental phenotypes, including astrogliosis, seizures, lifespan, and neuronal activity.
• Utilized single-nucleus RNA sequencing to analyze gene expression changes in various brain cell types.

Main Results:

• The PTHS mouse model displayed early-onset astrogliosis and developed severe recurrent seizures.
• Mice exhibited shortened lifespans and increased neuronal activity in key brain regions.
• Single-nucleus RNA sequencing revealed widespread gene expression alterations, including epilepsy-associated genes, across multiple cell types.

Conclusions:

• This study presents the first PTHS mouse model that accurately recapitulates the seizure phenotype.
• The model demonstrates the critical role of TCF4 in astrocytes for preventing epilepsy and ensuring normal lifespan.
• This valuable research tool can advance the understanding and treatment of PTHS and its associated epilepsy.