Volume 11, Issue 1, Pages (July 2006)

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Volume 11, Issue 1, Pages 125-132 (July 2006) In Vitro-Differentiated Embryonic Stem Cells Give Rise to Male Gametes that Can Generate Offspring Mice  Karim Nayernia, Jessica Nolte, Hans W. Michelmann, Jae Ho Lee, Kristina Rathsack, Nadja Drusenheimer, Arvind Dev, Gerald Wulf, Ingrid E. Ehrmann, David J. Elliott, Vera Okpanyi, Ulrich Zechner, Thomas Haaf, Andreas Meinhardt, Wolfgang Engel  Developmental Cell  Volume 11, Issue 1, Pages 125-132 (July 2006) DOI: 10.1016/j.devcel.2006.05.010 Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 1 Strategy for the Establishment of ES Cell-Derived Male Germline Stem Cell Lines (A) Schematic representation of the Stra8-EGFP and Prm1-DsRed reporter genes harboring a 1.4 kb and 0.5 kb promoter region of Stra8 and the mouse protamine 1 (Prm1) gene, respectively. These regions are able to direct reporter gene expression specifically in premeiotic and haploid male germ cells, respectively. Both reporter genes contain neomycin phosphotransferase II gene (NEO), which is driven by the SV40 early promoter and enhancer (SV40). (B) HE staining of an embryoid-like cell colony. (C) Immunostaining of an embryoid body-like cell colony with the anti-Mvh antibody shows differentiation of PGCs (arrow). (D) Fluorescent images of Stra8-EGFP (green) and Prm1-DsRed (red) proteins in the ES-derived SSC12 cell line after 72 hr of RA induction. The merged image shows different cells with green and red fluorescence, indicating activation of Stra8 and Prm1 promoters in different cell types. DAPI: fluorescent image showing DNA localization. (E) The merged fluorescent image of the supernatant from SSC12 cells after 72 hr of RA induction showing only red cells, which is an indication for release of Prm1-DsRed-positive cells into the medium. (F) Magnification of a red cell from supernatant showing positive immunoreaction with a sperm tail-specific protein, PHGPx (arrow). Bars in (B), (C), and (E) are 50 μm, bars in (D) are 100 μm, and bars in (F) are 10 μm. Developmental Cell 2006 11, 125-132DOI: (10.1016/j.devcel.2006.05.010) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 2 ES Cell-Derived Male Germ Cells Showing Premeiotic, Meiotic, and Postmeiotic Markers (A) RT-PCR analysis of SSC7 and SSC12 cell lines under nondifferentiating conditions shows only expression of PGC (Oct4, fragilis [Frgl], stella, mouse vasa homolog [Mvh], and Ddx4) and premeiotic-specific genes (Stra8, Rbm, Rnf17, and c-Kit [Vincent et al., 1998]). (B) RT-PCR analyses of SSC7 and SSC12 cells after treatment with RA (72 hr) show induction of meiotic (synaptonemal complex protein 3 [Scp3], acrosin [Acr], and Dmc1 [Tarsounas et al., 1999]) and postmeiotic (transition protein 2 [Tp2] and protamine 1 [Prm1]) gene expression. T, testis; C, nontemplate control. (C) Immunohistochemical analysis and formation of sperm structures. In immunohistochemical analysis, the expression of premeiotic-specific proteins, Hsp-90α, Dazl, Rbmy, Piwil2, and Stra8, is demonstrated (red). Meiosis was demonstrated by using immunostaining with an antibody against hnRNPGT, which is expressed specifically in pachytene spermatocytes (green). The formation of an acrosome-like structure is shown by antibodies against outer acrosomal membrane (OAM) and Acr (red). Condensation of the nucleus is demonstrated by immunohistochemical analysis by using Tp2. DSRed is located in the cytoplasm of the cells with condensed nuclei. 1+2, primary and secondary antibodies; 2, only secondary antibody used as a negative control. Developmental Cell 2006 11, 125-132DOI: (10.1016/j.devcel.2006.05.010) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 3 Identification of Haploid Male Germ Cells by FACS (A) The SSC12 cell line shows ∼30% haploid cells (1C) after 72 hr of RA treatment. (B) Testis cell suspension shows populations of cells that are in the haploid stage (1C), G0/G1 phase (2C), and G2/M phase (4C). (C) No haploidization was detected in feeder layer cells. (D) The formation of synaptonemal complex (Page and Hawley, 2004) in SSC12 cells after RA treatment identified by electron microscopy. Chromatin (red arrows) and the lateral element (green arrows) are shown. (E) Profiles of H19, Igf2r, and Snrpn methylation in noninduced (n), induced (i), after FACS, and supernatant (s) red cells of SSC7 and SSC12 cell lines. The percentages of unmethylated (red bars) and methylated (blue bars) CpG sites are given on the y axis. Developmental Cell 2006 11, 125-132DOI: (10.1016/j.devcel.2006.05.010) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 4 Functionality of ES Cell-Derived Male Gametes (A) Development of preimplantation embryos derived from intracytoplasmic injection (ICSI) of Prm1-DsRed-positive haploid cells into the CD1 or NMRI oocytes. (B) Full-term development of transferred two-cell embryos derived from ICSI with Prm1-DsRed-positive haploid cells. The red arrow shows an agouti mouse (5 days after birth) that carried both transgenic alleles, Stra8-EGFP and Prm1-DsRed; the green arrow demonstrates a white mouse (7 days after birth) that carried only the Prm1-DsRed reporter gene. (C) Genomic PCR with DNA isolated from tail biopsies shows seven mice with the Prm1-DsRed transgene and a mouse with the double transgene, Stra8-EGFP and Prm1-DsRed. Genomic PCR with primers specific for the TP2 gene serves as a positive control for PCR. +, PCR with Stra8-EGFP and the Prm1-DsRed reporter gene. −, nontemplate negative control. SSC12/1, SSC12/2, and SSC12/3: ICSI experiments with haploid germ cells of the SSC12 cell line. (D) Southern blot analysis with genomic DNA isolated from tail biopsies of the born mice. The blots were hybridized with DsRed- and EGFP-specific transgene probes, as well as with a loading control probe for the endogenous gene BrunoL1. Developmental Cell 2006 11, 125-132DOI: (10.1016/j.devcel.2006.05.010) Copyright © 2006 Elsevier Inc. Terms and Conditions