Gbx2 identifies two amacrine cell subtypes with distinct molecular, morphological, and physiological properties

BioRxiv : the Preprint Server for Biology
P. C. KersteinKevin M Wright

Abstract

Our understanding of how the nervous system works is limited by our ability to identify the neuronal subtypes that comprise functional circuits. Using a genetic approach, we show that the transcription factor Gbx2 labels two amacrine cell (AC) subtypes in the mouse retina that have distinct morphological, physiological, and molecular properties. One subtype of Gbx2+ ACs are likely the previously characterized On-type GABAergic CRH-1 AC. The other Gbx2+ AC population is a previously uncharacterized non-GABAergic, non-Glycinergic (nGnG) AC subtype. Gbx2+ nGnG ACs are On-Off type cells with asymmetric dendritic arbors. Gbx2+ nGnG ACs also exhibit tracer coupling to bipolar cells (BCs) through gap junctions that are modulated by dopamine signaling. This study genetically identifies a previously uncharacterized AC subtype and reveals an unusual AC-BC connectivity through gap junctions that may provide a novel model of synaptic communication and visual circuit function.

Related Concepts

Related Feeds

BioRxiv & MedRxiv Preprints

BioRxiv and MedRxiv are the preprint servers for biology and health sciences respectively, operated by Cold Spring Harbor Laboratory. Here are the latest preprint articles (which are not peer-reviewed) from BioRxiv and MedRxiv.

Adult Stem Cells

Adult stem cells reside in unique niches that provide vital cues for their survival, self-renewal, and differentiation. They hold great promise for use in tissue repair and regeneration as a novel therapeutic strategies. Here is the latest research.

Antianginal Drugs: Mechanisms of Action

Antianginal drugs, including nitrates, beta-blockers, and calcium channel blockers, are used in the treatment of angina pectoris. Here is the latest research on their use and their mechanism of action.