Dysfunction of AMPA receptor GluA3 is associated with aggressive behavior in human

Area of Science:

• Neurogenetics
• Behavioral Neuroscience
• Molecular Psychiatry

Background:

• Aggression poses significant societal and individual harm.
• The genetic underpinnings of human aggression are not well understood.
• The GRIA3 gene, encoding AMPA receptor GluA3, is implicated in neuronal function.

Purpose of the Study:

• To investigate the genetic basis of aggressive behavior.
• To identify specific genetic variants in GRIA3 associated with aggression.
• To elucidate the functional consequences of these variants on neuronal activity and behavior.

Main Methods:

• Identification of rare missense variants (G630R, E787G) in GRIA3 from male patients with aggressive syndromes.
• Functional assays to assess AMPA receptor GluA3 ion channel activity.
• Analysis of a guanine-repeat single nucleotide polymorphism (SNP, rs3216834) in the GRIA3 intron.
• Genotyping of rs3216834 in a Chinese Han male violent criminal sample.
• Utilizing GluA3 knockout mice to study the role of GluA3 in the medial prefrontal cortex (mPFC).

Main Results:

• GRIA3 variants G630R and E787G abolished AMPA receptor GluA3 ion channel function.
• Longer guanine repeats (10G/11G) at rs3216834 suppressed GRIA3 transcription compared to shorter repeats.
• An elevated frequency of rs3216834-10G/-11G was observed in male violent criminals.
• GluA3 knockout mice exhibited impaired excitatory neurotransmission and neuronal activity in the mPFC.
• Restoration of GluA3 in the mPFC of knockout mice reduced aggressive behavior.

Conclusions:

• Dysfunction of the AMPA receptor GluA3 is a contributing factor to aggressive behavior.
• Genetic variations in GRIA3, including missense mutations and intronic SNPs, impact GluA3 function and expression.
• The medial prefrontal cortex (mPFC) plays a crucial role in the neural mechanisms underlying aggression, mediated by GluA3.