(A) Model of Ntn1 loss of function in the ventral tegmental area (VTA) on excitatory and inhibitory balance. (B) Schematic of GABA and Dopamine Ntn1 cKO. (C) Distance traveled in 15 min bins over the course of three nights and two days (Two-Way ANOVA Group F(1, 45)=0.004273, p>0.05, Time F(17.16, 772.1)=23.36, p<0.0001, Interaction F (247, 11115)=1.492, p<0.0001). (D) Earned reinforcers during three days of FR1 or FR5 operant conditioning (n=21 controls, n=20 Ntn1 cKO, FR1: Group F(1, 40)=0.04247 p=0.8378, Time F(2, 80)=25.70 p<0.0001, Interaction F(2, 80)=1.402 p=0.2522; FR5: Group F(1, 40)=0.2244 p=0.6383, Time F(1.499, 59.95)=2.226 Pp0.1295, Interaction F(2, 80)=0.1385 p=0.8708) (E) Breakpoint (maximum presses per reinforcer) on a progressive ratio task (t=2.502, df = 39, *p<0.05) (F) Lever presses per session during five days of extinction training (Group F(1, 39)=6.990, *p=0.0117, Time F(2.381, 92.87)=42.95 p<0.0001, Interaction F(4, 156)=0.1470 p=0.9641). (G) Acoustic startle response to varying intensity white noise stimuli (Group F(1, 40)=0.1207 p=0.7301, Intensity F(1.775, 70.99)=36.77 p<0.0001, Interaction F(6, 240)=0.6127 p=0.7201). (G) Percent inhibition of startle response following pre-pulse at indicated intensities (Group F(1, 120)=0.9661 p=0.3276, Intensity F(2, 120)=7.067 p=0.0013, Interaction F(2, 120)=0.8861 p=0.4150). (H) Time on edge or in center of open field arena during a 10 min test session (edge: t=0.3584, df = 45 p>0,05, center: t=0.4233, df = 45, p>0.05).
Figure 6—source data 1. Behavioral data for Figure 6.