1. Pten regulates endocytic trafficking of cell adhesion and Wnt signaling molecules to pattern the retina.
- Author
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Touahri, Yacine, Hanna, Joseph, Tachibana, Nobuhiko, Okawa, Satoshi, Liu, Hedy, David, Luke, Olender, Thomas, Vasan, Lakshmy, Pak, Alissa, Mehta, Dhruv, Chinchalongporn, Vorapin, Balakrishnan, Anjali, Cantrup, Robert, Dixit, Rajiv, Mattar, Pierre, Saleh, Fermisk, Ilnytskyy, Yaroslav, Murshed, Monzur, Mains, Paul, Kovalchuk, Igor, Lefebvre, Julie, Leong, Hon, Cayouette, Michel, Wang, Chao, Del Sol, Antonio, Brand, Marjorie, Reese, Benjamin, and Schuurmans, Carol
- Subjects
CP: Cell biology ,CP: Developmental biology ,DSCAM ,PTEN phosphatase ,Wnt signaling ,cell adhesion molecules ,endocytic recycling ,extracellular vesicles ,retinal mosaics ,starburst amacrine cells ,Animals ,PTEN Phosphohydrolase ,Retina ,Wnt Signaling Pathway ,Cell Adhesion ,Mice ,Endocytosis ,Amacrine Cells ,Mice ,Knockout ,Protein Transport ,Wnt Proteins ,Cell Adhesion Molecules - Abstract
The retina is exquisitely patterned, with neuronal somata positioned at regular intervals to completely sample the visual field. Here, we show that phosphatase and tensin homolog (Pten) controls starburst amacrine cell spacing by modulating vesicular trafficking of cell adhesion molecules and Wnt proteins. Single-cell transcriptomics and double-mutant analyses revealed that Pten and Down syndrome cell adhesion molecule Dscam) are co-expressed and function additively to pattern starburst amacrine cell mosaics. Mechanistically, Pten loss accelerates the endocytic trafficking of DSCAM, FAT3, and MEGF10 off the cell membrane and into endocytic vesicles in amacrine cells. Accordingly, the vesicular proteome, a molecular signature of the cell of origin, is enriched in exocytosis, vesicle-mediated transport, and receptor internalization proteins in Pten conditional knockout (PtencKO) retinas. Wnt signaling molecules are also enriched in PtencKO retinal vesicles, and the genetic or pharmacological disruption of Wnt signaling phenocopies amacrine cell patterning defects. Pten thus controls vesicular trafficking of cell adhesion and signaling molecules to establish retinal amacrine cell mosaics.
- Published
- 2024