A predictable conserved DNA base composition signature defines human core DNA replication origins
Research output: Contribution to journal › Article › peer-review
DNA replication initiates from multiple genomic locations called replication origins. In metazoa, DNA sequence elements involved in origin specification remain elusive. Here, we examine pluripotent, primary, differentiating, and immortalized human cells, and demonstrate that a class of origins, termed core origins, is shared by different cell types and host ~80% of all DNA replication initiation events in any cell population. We detect a shared G-rich DNA sequence signature that coincides with most core origins in both human and mouse genomes. Transcription and G-rich elements can independently associate with replication origin activity. Computational algorithms show that core origins can be predicted, based solely on DNA sequence patterns but not on consensus motifs. Our results demonstrate that, despite an attributed stochasticity, core origins are chosen from a limited pool of genomic regions. Immortalization through oncogenic gene expression, but not normal cellular differentiation, results in increased stochastic firing from heterochromatin and decreased origin density at TAD borders.
|Number of pages||15|
|Early online date||21 Sep 2020|
|Publication status||Published - Dec 2020|
- DNA replication origins, DNA replication initiation, TAD domains, cancer, p53, Heterochromatin/genetics, Humans, Cells, Cultured, DNA Replication/genetics, Carcinogenesis, Animals, Nucleotide Motifs, Base Composition, Replication Origin/genetics, Base Sequence, Genome, Human/genetics, DNA/biosynthesis, Transcription, Genetic, Cell Differentiation, Mice