Role for Wnt Signaling in Retinal Neuropil Development: Analysis via RNA-Seq and In Vivo Somatic CRISPR Mutagenesis.

Role for Wnt Signaling in Retinal Neuropil Development: Analysis via RNA-Seq and In Vivo Somatic CRISPR Mutagenesis.
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DOI:
10.1016/j.neuron.2018.03.004
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发表时间:
2018-04-04
期刊:
影响因子:
16.2
通讯作者:
Zipursky SL
Zipursky SL
中科院分区:
医学1区
文献类型:
--
作者:
Sarin S;Zuniga-Sanchez E;Kurmangaliyev YZ;Cousins H;Patel M;Hernandez J;Zhang KX;Samuel MA;Morey M;Sanes JR;Zipursky SL

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Screens for genes that orchestrate neural circuit formation in mammals have been hindered by practical constraints of germ-line mutagenesis. To overcome these limitations, we combined RNAseq with somatic CRISPR mutagenesis to study synapse development in the mouse retina. Here synapses occur between cellular layers, forming two multilayered neuropils. The outer neuropil, the outer plexiform layer (OPL), contains synapses made by rod and cone photoreceptor axons on rod and cone bipolar dendrites, respectively. We used RNAseq to identify selectively expressed genes encoding cell surface and secreted proteins and CRISPR-Cas9 electroporation with cell-specific promoters to assess their roles in OPL development. Among the genes identified in this way are Wnt5a and Wnt5b. They are produced by rod bipolars and activate a non-canonical signaling pathway in rods to regulate early OPL patterning. The approach we use here can be applied to other parts of the brain. Photoreceptors form synapses on interneurons in the retina. Sarin et al. used RNAseq and somatic CRISPR/Cas9 mutagenesis to seek genes required for this process. They show that Wnt5 produced by bipolar interneurons acts on rod photoreceptors to regulate synapse location.
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