Work

Srcap Chromatin Remodeler Is Required for Efficient Replication Dynamics in Mammalian Cells

Year: 2025

Type: article

Abstract: The SNF2-related chromatin remodeler Srcap is the principal ATPase responsible for the deposition of the histone variant H2A.Z at promoters and regulatory chromatin regions. Although this activity is known to modulate transcription, its contribution to DNA replication remains unexplored. Here we show that Srcap is required for efficient replication fork progression and origin firing in mammalian cells. Using RNA interference in human PC3 cells, we found that Srcap depletion leads to a ~25% reduction in fork elongation rate, decreased replication fork density, accumulation of the replication-stress marker γH2AX, and reduced chromatin-bound H2A.Z. High-resolution expansion microscopy further revealed diminished intensity and increased spacing of replication foci, consistent with reduced origin activation. Transcriptomic analysis of published data identified broad downregulation of replication-associated genes. These data uncover a dual mechanism by which Srcap sustains replication efficiency-through both H2A.Z-dependent chromatin organization and transcriptional maintenance of the replication machinery. Our findings establish Srcap as an important coordinator of replication dynamics, with implications for genome stability.

Source: International Journal of Molecular Sciences

DOI: 10.3390/ijms262412189

Authors: Stefka K. Dzhokova, Rossitsa H. Hristova, Peter S. Botev, Temenouga N. Guecheva, Anastas G. Gospodinov

Institutions: Bulgarian Academy of Sciences, Institute of Molecular Biology

Language: English

Topic: Genomics and Chromatin Dynamics

Subfield: Molecular Biology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $3,499