Journal: bioRxiv
Article Title: GABAergic network from AVP neurons to VIP neurons in the suprachiasmatic nucleus sets the activity/rest time of the circadian behavior rhythm
doi: 10.1101/2025.04.28.650944
Figure Lengend Snippet: (A) Schematic diagram of viral vector (AAV- CAG-FLEX-jGCaMP7s and AAV- U6-gGabrb1,2,3-EF1α-DIO-mCherry or AAV- U6-gControl-EF1α-DIO-mCherry ) injection and optical fiber implantation at the SCN in Rosa26-CAG-LSL-SpCas9-2A-EGFP; Vip-ires-Cre mice to generate control or Vip-GABA A R −/− mice for fiber photometry recording. (B) A representative coronal section of mice with jGCaMP7s expression and gRNA-DIO-mCherry expression in SCN VIP neurons. A white dotted square shows the estimated position of the implanted optical fiber. Green, jGCaMP7s; magenta, mCherry. (C) Representative plots of the in vivo jGCaMP7s signal of SCN VIP neurons (green) overlaid with locomotor activity (home-cage activity) (black) in actograms. Control (Left) and Vip-GABA A R −/− (Right) mice were initially housed in LD (LD1 to LD7) and then in DD (DD1 to DD15). Gray shading indicates the time when the lights were off. (D) Plots of locomotor activity onset (black), activity offset (gray), VIP-Ca 2+ onset (green), VIP-Ca 2+ offset (light green), and VIP-Ca 2+ midpoint (magenta) of mean ± SEM (left column) and individual (right column) in control and Vip-GABA A R -/- mice. (E) Normalized VIP-Ca 2+ daily rhythm profiles in LD (LD3-7, top) or in DD (DD5-14,middle and bottom). In DD, circadian time 12 was determined as the onset of locomotor activity and VIP-Ca 2+ circadian time 0 was determined as the onset of VIP-Ca 2+ . (F) High VIP-Ca 2+ duration in LD (LD3-7, left) or in DD (DD5-14, right). (G) High VIP-Ca 2+ duration in LD (LD3-7, left) or in DD (DD5-14, right) calculated with 20% amplitude of the VIP-Ca 2+ profile as the threshold to determine the Ca 2+ onset and offset. Values are mean ± SEM. n = 7 for control, n = 5 for Vip-GABA A R −/− mice. *P < 0.05; **P < 0.01 by two-tailed Student t tests.
Article Snippet: Then, a fragment containing two tandem units of U6-gRNA was amplified by PCR, using the following primers: 5’-agtacgcgTCGAGCATGCTCGAGAATGG-3’ and 5’-agtacgcgtCGGGTACCCCATTTGTCTGC-3’, and cloned into the MluI site of pAAV-EF1a-DIO-mCherry (a gift from Dr. Bryan Roth) as described previously [ ]. pAAV-U6-gGabrb2-EF1α-DIO-mCherry happened to contain two copies of the amplified fragment. pAAV-U6-gControl-EF1α-DIO-mCherry contains spacer sequences from pX333 (Addgene plasmid #64073, a gift from Dr. Andrea Ventura) instead of gRNA sequences for Gabrb3 genes. pAAV - CAG-FLEX-ChrimsonR-mCherry was described previously (9).
Techniques: Plasmid Preparation, Injection, Control, Expressing, In Vivo, Activity Assay, Two Tailed Test
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