(A) Homologous recombination occurred between the wild-type allele of Brn3b and the targeting vector resulting in complete replacement of the coding reading frame (black bars) with the GFP reporter and PGK-Neo cassette, but the start codon ATG was retained for GFP translation. TGA indicates the stop codon and the positions of BamHI, NcoI, NotI and SalI restriction endonucleases are also indicated.
(B)Southern blot analysis of BamHI-digested wild-type and heterozygous DNA. The 3' end probe identified BamHI bands of 10.1 kb (wild-type allele) and 6.2 kb (knock-in allele).
图2 3D视网膜类器官诱导无血清类胚体快速重聚集悬浮培养法(serum-free embryoid body quick reaggregation,SFEBq)培养流程,包括饲养层细胞培养,ESC复苏、维持和传代培养,ESC诱导分化,视网膜组织和体外视杯的形成,视网膜类器官收集、RGC的富集等过程
Figure 2 Schematic diagram of serum-free embryoid body quick reaggregation (SFEBq) methods for retinal tissue differentiation from mouse ESCs, including feeder cell culture, ESC resuscitation, maintenance and passage, ESC differentiation, retinal tissue and optic cup formation, and retinal organoid collection and RGC enrichment
(A) Schematic diagram of the 3D culture process. (B-D) ESCs spontaneously formed clump-like structures on day 1 (D1) and small optic vesicle-like structures by day 7 (arrows indicate optic cup-like structures). (E-J) After 10 days of culture, GFP began to express, indicating the gradual differentiation of RGCs. After 14 days of culture, a typical optic cup-like structure appeared and GFP signal was expressed inside the optic cup, indicating the presence of differentiated RGCs. (K,L) After 17 days of culture, the signal of GFP expressed in the optic cup was co-localized with Brn3b and Isl1, indicating that GFP was specifically expressed in RGCs. (M,N) By day 21, GFP expressed in the inner layer of retinal organoids was co-localized with Pax6 or Tuj1, indicating that RGCs were correctly localized to the inner layer of retinal organoids.(O) By day 21, recoverin and Chx10, specific molecular markers of photoreceptors and bipolar cells, respectively, were also abundantly expressed in the optic cup. Scale bars: B, 320 μm; C-J, 160 μm; K-O, 20 μm.
(A) Time schedule of RGC transplantation; (B) Surviving transplanted RGCs in retinal flat-mounts of control (WT) and NMDA injury models. Arrows point to surviving GFP-positive RGCs; (C) Retinal sections showing surviving transplanted RGCs in control and NMDA injury groups. Arrows point to surviving GFP-positive RGCs; (D) Quantification of the surviving transplanted RGCs. After NMDA treatment, the number of surviving GFP-positive RGCs was significantly increased (WT: n=3; NMDA: n=4; *P=0.0233). Scale bars: B, C, 20 μm.
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