What question did this study set out to answer?

To investigate the role of Htr1b in retinal function and serotonergic signaling in mice.

Htr1b is necessary for normal retinal function in mice

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This research demonstrates that depriving Htr1b affects visual function and inhibits serotonergic signaling in retinal cells.

To investigate the role of Htr1b in retinal function and serotonergic signaling in mice.
Examined Htr1b localization using RNAseq and in situ labeling.
Assessed retinal structure through histology and SD-OCT imaging.
Evaluated visual function with optomotor behavioral experiments and electroretinography (ERG).
Conducted ex vivo analysis using multielectrode array (MEA) recordings.
Htr1b localizes primarily to the inner retina and retinal ganglion cells (RGCs).
Htr1b –/– mice showed visual deficits in contrast sensitivity and visual acuity despite normal retinal anatomy.
ERG recordings indicated latency delays and reduced sensitivity to light changes in RGCs from Htr1b –/– mice.
MEA analysis revealed altered RGC firing patterns and variability after 5-HT application.

Gibson et al. (2025) studied this question.

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