behavior/neurological
• when the allele is inherited maternally, mice nose poke more for 30 Hz stimulation than controls, indicating enhanced motivation
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nervous system
• mice with a maternally inherited allele show a greater than 50% reduction in peak amplitude of GABAergic currents relative to controls, while current decay kinetics are normal, indicating decreased GABA co-release
• mice with a maternally inherited allele exhibit diminished GABAergic currents at 30 Hz stimulation of ventral tegmental area-to-nucleus accumbens (VTA-to-NAc) terminals compared to controls
• expression of exogenous vesicular GABA transporter (VGAT) within TH+ terminals normalizes optical intracranial self-stimulation in mice with a maternally inherited allele
• however, no changes in optically evoked dopamine release in TH+ VTA-to-NAc terminals is seen in mice with a maternally inherited allele and mice also exhibit normal glutamatergic co-release with optical stimulation of VTA-to-NAc termimals
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