DNA Replication Dynamics in Eukaryotic Cells and Systems

DNA replication in eukaryotes is a highly orchestrated process that ensures precise genome duplication before cell division. Initiation occurs at multiple replication origins that are licensed in G1 phase and activated during S phase, giving rise to replication forks that progress bidirectionally. The temporal order of origin activation, known as the replication timing programme, correlates with chromatin state and transcriptional activity, partitioning the genome into early and late replicating domains. Spatial organisation within the nucleus further influences replication dynamics, as regions associated with the nuclear lamina tend to replicate late and exhibit increased fragility under stress. Recent advances have revealed that replication fork speed is not uniform but accelerates through S phase, modulated by transcription-associated obstacles and epigenetic marks. Single-cell analyses and live imaging have resolved replication foci at the level of individual replicons, demonstrating heterogeneity within and between cell types. Perturbations of replication checkpoint kinases or licensing factors can induce replication stress, leading to genomic instability implicated in ageing and cancer. A deeper understanding of replication dynamics has direct applications in improving chemotherapeutic targets, refining regenerative therapies and safeguarding genome integrity in biotechnological applications.

Research from Nature Portfolio

Recent studies have introduced single-cell sequencing methods to map replication speed at unprecedented resolution, showing that fork progression accelerates through S phase and is constrained by transcriptional activity in early replicating regions. Genetic or pharmacological perturbation of DNA damage response pathways can modulate this acceleration, revealing a balance between replication efficiency and genome surveillance. Complementary work in mammalian embryos has demonstrated that early and late replication programmes are established immediately after fertilisation, with late-replicating, lamina-associated domains predisposed to chromosome fragility due to sparse dormant origins. These investigations illustrate how replication timing and origin density are laid down at the outset of development and influence genome stability in subsequent lineages.

DNA Replication Dynamics in Eukaryotic Cells and Systems publication trend

The graph below shows the total number of articles in dna replication dynamics in eukaryotic cells and systems across all publications each year (not limited to Nature Index journals).

Technical terms

Replication origin: A genomic site licensed to initiate DNA synthesis during S phase.

Replication fork: The junction where parental DNA strands are unwound and replicated bidirectionally.

Replication timing: The schedule by which distinct genomic regions are duplicated during S phase.

Replication stress: A state of slowed or stalled fork progression often leading to genomic instability.

References

1. Quantifying DNA replication speeds in single cells by scEdU-seq. Nature Methods (2024).
2. DNA replication in early mammalian embryos is patterned, predisposing lamina-associated regions to fragility. Nature Communications (2024).
3. OKseqHMM: a genome-wide replication fork directionality analysis toolkit. Nucleic Acids Research (2023).
4. 4D Visualization of replication foci in mammalian cells corresponding to individual replicons. Nature Communications (2016).
5. The Spatiotemporal Program of DNA Replication Is Associated with Specific Combinations of Chromatin Marks in Human Cells. PLOS Genetics (2014).
6. High-resolution Repli-Seq defines the temporal choreography of initiation, elongation and termination of replication in mammalian cells. Genome Biology (2020).