Dopaminergic and behavioural changes in a loss-of-imprinting model of Cdkn1c

Area of Science:

• Neuroscience
• Epigenetics
• Developmental Biology

Background:

• The imprinted gene Cdkn1c is crucial for fetal growth and placental development.
• Cdkn1c also plays a vital role in the proliferation and differentiation of midbrain dopaminergic neurons.

Purpose of the Study:

• To investigate the neurobiological and behavioral consequences of elevated Cdkn1c expression in the brain.
• To understand the impact of altered Cdkn1c dosage on the dopaminergic system.

Main Methods:

• Utilized a transgenic mouse model (Cdkn1c^BACx1) with twofold increased Cdkn1c expression.
• Analyzed dopamine system-related gene expression, tyrosine hydroxylase (Th) staining, and dopamine levels in the striatum.
• Assessed behavioral changes including amphetamine hypersensitivity, food motivation, and social dominance.

Main Results:

• Increased Cdkn1c expression led to altered dopamine system gene expression and increased dopamine levels in the striatum.
• Cdkn1c^BACx1 mice showed hypersensitivity to amphetamine and altered behaviors dependent on the mesolimbic dopaminergic system.
• These mice exhibited increased motivation for palatable foods and enhanced social dominance.

Conclusions:

• Elevated Cdkn1c expression significantly impacts brain function, leading to neurobiological and behavioral alterations.
• This study demonstrates the critical importance of precise Cdkn1c gene dosage for normal brain development and behavior.
• Findings underscore the influence of epigenetic factors on neurobiology and behavior, with implications for understanding neurological disorders.