Altered thalamo-prefrontal synchrony dynamics during spatial working memory task performance in a SETD1A...

Area of Science:

• Neuroscience
• Genetics
• Epigenetics

Background:

• Schizophrenia is characterized by significant working memory deficits.
• Haploinsufficiency of SETD1A, a gene involved in epigenetic regulation, increases schizophrenia and neurodevelopmental disorder risk.
• Understanding the impact of SETD1A mutations on neural circuits is crucial for developing treatments.

Purpose of the Study:

• To investigate how SETD1A haploinsufficiency affects neural oscillatory synchrony in brain circuits essential for spatial working memory (SWM).
• To examine the functional connectivity alterations in mice with a loss-of-function SETD1A allele during an SWM task.

Main Methods:

• Local field potential recordings were conducted in the prefrontal cortex, hippocampus, and thalamic nucleus reuniens of wildtype and Setd1a+/- mice.
• Mice performed a delayed non-match to sample task to assess spatial working memory.
• Neural oscillatory synchrony was analyzed across different frequencies and task epochs.

Main Results:

• Setd1a+/- mice showed normal prefrontal-hippocampal synchrony across frequencies and task phases.
• A significant reduction in beta-frequency synchrony between the prefrontal cortex and nucleus reuniens was observed during SWM maintenance in Setd1a+/- mice.
• Bidirectional modulation of prefrontal-reuniens beta- and gamma-frequency synchrony across SWM task epochs was blunted in Setd1a+/- mice.

Conclusions:

• SETD1A haploinsufficiency disrupts functional connectivity within specific brain circuits supporting SWM.
• These findings elucidate how genetic risk factors for schizophrenia impact neural network function.
• This research provides a foundation for understanding the neurobiological underpinnings of working memory deficits in schizophrenia.