Accelerated DNA replication fork speed due to loss of R-loops in myelodysplastic syndromes with SF3B1 mutation - Institut Curie
Article Dans Une Revue Nature Communications Année : 2024

Accelerated DNA replication fork speed due to loss of R-loops in myelodysplastic syndromes with SF3B1 mutation

Tony Rached
Sabrina Bondu
  • Fonction : Auteur
Anne Letessier
Raphael Mangione
Batoul Farhat
Ismael Boussaid
Chloé Friedrich
Aurore Tourville
Françoise Levavasseur
Marjorie Leduc
Morgane Le Gall
Sarah Battault
  • Fonction : Auteur
Nicolas Chapuis
Olivier Kosmider
Angelos Constantinou
Benoit Palancade
Benoit Miotto
Frédéric Chédin

Résumé

Myelodysplastic syndromes (MDS) with mutated SF3B1 gene present features including a favourable outcome distinct from MDS with mutations in other splicing factor genes SRSF2 or U2AF1 . Molecular bases of these divergences are poorly understood. Here we find that SF3B1 -mutated MDS show reduced R-loop formation predominating in gene bodies associated with intron retention reduction, not found in U2AF1 - or SRSF2 -mutated MDS. Compared to erythroblasts from SRSF2- or U2AF1 -mutated patients, SF3B1 -mutated erythroblasts exhibit augmented DNA synthesis, accelerated replication forks, and single-stranded DNA exposure upon differentiation. Importantly, histone deacetylase inhibition using vorinostat restores R-loop formation, slows down DNA replication forks and improves SF3B1 -mutated erythroblast differentiation. In conclusion, loss of R-loops with associated DNA replication stress represents a hallmark of SF3B1 -mutated MDS ineffective erythropoiesis, which could be used as a therapeutic target.
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hal-04591955 , version 1 (04-09-2024)

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David Rombaut, Carine Lefèvre, Tony Rached, Sabrina Bondu, Anne Letessier, et al.. Accelerated DNA replication fork speed due to loss of R-loops in myelodysplastic syndromes with SF3B1 mutation. Nature Communications, 2024, 15 (1), pp.3016. ⟨10.1038/s41467-024-46547-7⟩. ⟨hal-04591955⟩
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