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TIP60/KAT5 is required for neuronal viability in hippocampal CA1
Inga Urban1, Cemil Kerimoglu2, M Sadman Sakib2
1Genes and Behavior Department, Max Planck Institute for Biophysical Chemistry, 37077, Göttingen, Germany.
Scientific Reports
|November 9, 2019
Summary
Lysine acetyltransferase TIP60 (also known as KAT5) is crucial for maintaining neuronal function and preventing cognitive decline. Its deficiency in adult mice causes widespread transcriptional dysfunction, leading to neurodegeneration and memory impairment.
Area of Science:
- Neuroscience
- Molecular Biology
- Epigenetics
Background:
- Aberrant histone acetylation is linked to age-related cognitive decline and neurodegenerative conditions.
- The role of lysine acetyltransferase TIP60 (KAT5) in neuronal health and function remains incompletely understood.
Purpose of the Study:
- To investigate the function of TIP60/KAT5 in hippocampal neurons.
- To elucidate the molecular mechanisms by which TIP60 influences neuronal viability and cognitive function.
Main Methods:
- Utilized an inducible mouse model to specifically deplete TIP60 in adult forebrain neurons.
- Analyzed transcriptional changes, histone acetylation patterns (H4K12ac), and markers of neurodegeneration (Caspase 3 activation, β-actin fragmentation).
- Assessed cognitive function through memory impairment tests.
Main Results:
- TIP60 deficiency rapidly induced widespread transcriptional dysfunction in CA1 neurons, characterized by upregulation of cell cycle/immunity genes and downregulation of learning/plasticity genes.
- Downregulated genes showed hypoacetylation at H4K12ac.
- TIP60-deficient mice exhibited delayed neurodegenerative phenotypes, including Caspase 3 activation and β-actin fragmentation, culminating in neuronal loss and mild memory deficits.
- Gene expression profiles overlapped with the CK-p25 neurodegeneration model.
Conclusions:
- TIP60/KAT5 plays a critical role in maintaining neuronal transcriptional networks essential for viability.
- TIP60-mediated histone acetylation is vital for regulating genes involved in neuronal function and plasticity.
- Dysregulation of TIP60 contributes to neurodegeneration and cognitive impairment, highlighting its therapeutic potential.
