Generation of Lamc1EQ/EQ knock-in mice.

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Presentation transcript:

Generation of Lamc1EQ/EQ knock-in mice. Generation of Lamc1EQ/EQ knock-in mice. (A) Schematic diagram of the targeted mutation of Lamc1. The open boxes represent exons. The knock-in construct was designed to replace WT exon 28 encoding Glu at residue 1,605 with a mutant exon 28 encoding Gln at residue 1,605. The probes used for Southern blotting are indicated by bold lines. (B) Southern blot analyses of genomic DNA from WT, Lamc1EQ(neo)/+, and Lamc1EQ/+ offspring after digestion with SexAI and PacI. The detection of 9.0- and 7.4-kbp fragments with probe 1 and probe 2, respectively, in the Lamc1EQ(neo)/+ lanes indicates the occurrence of the expected homologous recombination. The detection of a 7.4-kbp fragment with probe 1 in the Lamc1EQ/+ lane indicates that the neomycin-resistance gene has been removed from the Lamc1EQ(neo) allele by the Cre-loxP system. (C) Survival of WT, Lamc1EQ/+, and Lamc1EQ/EQ littermates obtained from Lamc1EQ/+ intercrosses. (D) Western analyses of a protein extract from a Lamc1EQ/EQ E7.5 whole embryo and Matrigel using an anti-laminin antibody under nonreducing conditions. (E, F) In situ binding of recombinant integrin α7x2β1 (green) in E7.5 WT or Lamc1EQ/+ (E) and Lamc1EQ/EQ (F) frozen sections. The RM was counterstained with an anti–laminin-α1 mAb (magenta). Bars, 100 μm. (G, H) Light microscopic images of control Lamc1EQ/+ (G) and Lamc1EQ/EQ (H) E7.5 whole embryos. The filled arrowhead indicates the PYS. The open arrowheads indicate trophoblast giant cells. Bars, 200 μm. (I–K) Immunofluorescence staining for cytokeratin-8 (magenta) and laminin (green) in WT or Lamc1EQ/+ (I) and Lamc1EQ/EQ (J, K) E7.5 sections. Blue, nuclei. The boxed area in J is magnified in K. The open diamonds in I indicate the blood sinus. The asterisks in I and J indicate trophoblast giant cells. The arrowheads in K indicate the extracellular matrix structure. Bars, 100 μm. Amn, amnion; Ch, chorion; ExE, extraembryonic ectoderm; Epi, epiblast; S, SexAI restriction site; P, PacI restriction site; TK, thymidine kinase gene; EPC, ectoplacental cone; EC, egg cylinder; PYS, parietal yolk sac. Daiji Kiyozumi et al. LSA 2018;1:e201800064 © 2018 Kiyozumi et al.