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Human macula formation involves two waves of retinoic acid suppression via CYP26A1 that modulate cell cycle exit and cone subtype specification
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Human macula formation involves two waves of retinoic acid suppression via CYP26A1 that modulate cell cycle exit and cone subtype specification
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Paper
Human macula formation involves two waves of retinoic acid suppression via CYP26A1 that modulate cell cycle exit and cone subtype specification
2025
Overview
The human macula is a specialized, cone-rich region of the eye, critical for high-acuity vision, yet the pathways regulating its development remain poorly understood. RA-catabolizing enzyme CYP26A1 establishes the chick high-acuity area via upregulation of FGF8. However, detailed analysis of this pathway and its functions has not been performed in early human fetal tissue. Fluorescent in situ hybridization revealed striking biphasic CYP26A1 expression but little FGF8 in the presumptive macula region between post-conception weeks (PCW)6-17. Pharmacological RA signaling inhibition in human retinal organoids mimicking the two waves of CYP26A1 revealed early RA inhibition prompted early cell cycle exit and increased cone genesis, while late inhibition altered cone subtype specification. Conversely, recombinant FGF8 had no effect on photoreceptor fate. This work provides spatiotemporal examination of CYP26A1 across human macular development, as well as experimental evidence for the different roles of RA signaling inhibition in a human model of retinal development.
Publisher
Cold Spring Harbor Laboratory
Subject
