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The precise control of growth and maintenance of the retinal ganglion cell (RGC) dendrite arborization is critical for normal visual functions in mammals. However, the underlying mechanisms remain elusive. Here, we find that the  N  6 -methyladenosine (m 6 A) reader YTHDF2 is highly expressed in the mouse RGCs. Conditional knockout (cKO) of  Ythdf2  in the retina leads to increased RGC dendrite branching, resulting in more synapses in the inner plexiform layer. Interestingly, the  Ythdf2  cKO mice show improved visual acuity compared with control mice. We further demonstrate that  Ythdf2  cKO in the retina protects RGCs from dendrite degeneration caused by the experimental acute glaucoma model. We identify the m 6 A-modified YTHDF2 target transcripts which mediate these effects. This study reveals mechanisms by which YTHDF2 restricts RGC dendrite development and maintenance. YTHDF2 and its target mRNAs might be valuable in developing new treatment approaches for glaucomatous eyes.

The m 6 A reader YTHDF2 is a negative regulator for dendrite development and maintenance of retinal ganglion cells