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DNA replication in differentiated cells follows a defined program, but when and how it is established during mammalian development is not known. Here we show using single-cell sequencing, that both bovine and mouse cleavage stage embryos progress through S-phase in a defined pattern. Late replicating regions are associated with the nuclear lamina from the first cell cycle after fertilization, and contain few active origins, and few but long genes. Chromosome breaks, which form spontaneously in bovine embryos at sites concordant with human embryos, preferentially locate to late replicating regions. In mice, late replicating regions show enhanced fragility due to a sparsity of dormant origins that can be activated under conditions of replication stress. This pattern predisposes regions with long neuronal genes to fragility and genetic change prior to segregation of soma and germ line. Our studies show that the formation of early and late replicating regions is among the first layers of epigenetic regulation established on the mammalian genome after fertilization.
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