Diagenode

The genetic landscape of origins of replication in P. falciparum


Casilda Muñoz Castellano et al.

Various origin mapping approaches have enabled genome-wide identification of origins of replication (ORI) in model organisms, but only a few studies have focused on divergent organisms. By employing three complementary approaches we provide a high-resolution map of ORIs in Plasmodium falciparum, the deadliest human malaria parasite. We profiled the distribution of origin of recognition complex (ORC) binding sites by ChIP-seq of two PfORC subunits and mapped active ORIs using NFS and SNS-seq. We show that ORIs lack sequence specificity but are not randomly distributed, and group in clusters. Licensing is biased towards regions of higher GC content and associated with G-quadruplex forming sequences (G4FS). While strong transcription likely enhances firing, active origins are depleted from transcription start sites. Instead, most accumulate in transcriptionally active gene bodies. Single molecule analysis of nanopore reads containing multiple initiation events, which could have only come from individual nuclei, showed a relationship between the replication fork pace and the distance to the nearest origin. While some similarities were drawn with the canonic eukaryote model, the distribution of ORIs in P. falciparum is likely shaped by unique genomic features such as extreme AT-richness—a product of evolutionary pressure imposed by the parasitic lifestyle.

Tags
Microplex Library Preparation kit

Share this article

Published
December, 2023

Source

Products used in this publication

  • chip kit icon
    C05010001
    MicroPlex Library Preparation Kit v3 /48 rxns

Events

  • APHL 2024
    Milwaukee, Wisconsin, USA
    May 6-May 9, 2024
  • London Calling 2024
    London, UK
    May 21-May 24, 2024
  • Symposium of the Young Scientist Association
    Vienna, Austria
    May 28-May 29, 2024
 See all events

News

 See all news


The European Regional Development Fund and Wallonia are investing in your future.

Extension of industrial buildings and new laboratories.


       Site map   |   Contact us   |   Conditions of sales   |   Conditions of purchase   |   Privacy policy   |   Diagenode Diagnostics