Fig. 6.
LIN28 depletion after fertilization results in a developmental arrest. (A,B) A significant number of Lin28A-MO-injected embryos arrest at the 2- or 4-cell stage after 48 hours of in vitro culture in comparison with controls (P<0.001). Lin28A-MO-injected embryos never develop to morula or blastocyst stage after 96 hours of in vitro culture, unlike the majority of control embryos. Error bars represent mean ± s.e.m. from at least three independent sets of experiments. (C) Immunostaining confirmed that nucleolar LIN28 expression is absent in Lin28A-MO-injected embryos, arrested at the 4-cell stage, but present in Control-MO-injected and uninjected embryos. DNA was counterstained with propidium iodide. Scale bar: 20 μm.