Nrg1 haploinsufficiency alters inhibitory cortical circuits
Carmen Navarro-Gonzalez1, Héctor Carceller1, Marina Benito Vicente2
1Lab of Cortical Circuits in Health and Disease, CIPF Centro de Investigación Príncipe Felipe, Valencia, Spain.
Neuregulin 1 (NRG1) haploinsufficiency impairs inhibitory cortical circuits, leading to schizophrenia-like behaviors. This study reveals synaptic and molecular changes in a novel mouse model, differentiating it from ErbB4 deletions.
Area of Science:
- Neuroscience
- Genetics
- Psychiatry
Background:
- Neuregulin 1 (NRG1) and ERBB4 are schizophrenia (SZ) risk genes impacting cortical circuit development.
- Previous research focused on ERBB4 deficiency, overlooking NRG1's role and potential partial loss-of-function due to non-coding polymorphisms.
Purpose of the Study:
- To investigate the cellular and molecular basis of SZ-like behavioral deficits in a haploinsufficient mouse model of NRG1 (Nrg1tm1Lex).
- To determine if NRG1 hypofunction primarily affects inhibitory or excitatory cortical circuits.
Main Methods:
- Magnetic Resonance Spectroscopy (MRS)
- Electrophysiology
- Quantitative imaging
- Molecular analysis
- Characterization of Nrg1tm1Lex mice
Main Results:
- NRG1 haploinsufficiency impairs inhibitory cortical circuits.
- Observed decreased Vglut1+ excitatory boutons on Parvalbumin interneurons and reduced spontaneous inhibitory postsynaptic currents.
- Found fewer Parvalbumin interneurons and altered Calretinin expression, with no significant changes in excitatory neurons.
Conclusions:
- NRG1 haploinsufficiency primarily affects cortical inhibitory circuits, unlike ErbB4 deletions.
- Provides insights into synaptic and molecular impairments in a preclinical model of SZ linked to NRG1 hypofunction.
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