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Mammalian oocytes/zygotes are different from somatic cells in their ability to reprogram somatic cells into a totipotent state enabling animal cloning through somatic cell nuclear transfer(SCNT).SUV39H1/2-mediated histone H3 lysine-9 trimethylation(H3K9me3)of donor cell genome is a major barrier for efficient reprogramming by SCNT.However,it remained unclear how the SUV39H1/2 activities were removed in early embryos derived from normal fertilization or SCNT.