Histone variant H2BE controls activity-dependent gene expression and homeostatic scaling

Area of Science:

• Neuroscience
• Molecular Biology
• Epigenetics

Background:

• Neuronal responses depend on transcriptional programs regulated by histone proteins.
• Histone variant H2BE promotes transcription and is crucial for long-term memory.
• The regulation of H2BE by synaptic stimuli and its role in activity-dependent responses are not fully understood.

Purpose of the Study:

• To investigate if H2BE is regulated by synaptic stimuli.
• To determine if H2BE controls activity-dependent responses in neurons.
• To elucidate the role of H2BE in homeostatic plasticity.

Main Methods:

• Assessing H2BE depletion following short-term and long-term activity increases.
• Analyzing transcriptional responses in H2BE-deficient cultured neurons and animal models.
• Evaluating electrophysiological changes in H2BE-knockout neurons.

Main Results:

• H2BE is depleted after long-term, but not short-term, neuronal activity increases.
• Neurons lacking H2BE exhibit impaired long-term activity-dependent transcriptional responses.
• H2BE-knockout neurons do not show the electrophysiological changes linked to homeostatic plasticity.

Conclusions:

• H2BE expression is inversely correlated with neuronal activity.
• H2BE is essential for long-term activity-dependent scaling responses.
• Histone variant H2BE plays a critical role in regulating homeostatic plasticity in neurons.