0584844 - ÚMG 2025 RIV GB eng J - Journal Article
Turková, T. - Kokavec, J. - Zikmund, T. - Dibus, Nikol - Pimková, K. - Němec, D. - Holečková, M. - Rusková, L. - Sedláček, Radislav - Čermák, Lukáš - Stopka, T.
Differential requirements for Smarca5 expression during hematopoietic stem cell commitment.
Communications Biology. Roč. 7, č. 1 (2024), č. článku 244. E-ISSN 2399-3642
R&D Projects: GA MZd NU22-05-00374; GA MZd NU21-08-00312; GA MŠMT LX22NPO5102; GA MŠMT(CZ) LM2018126; GA MŠMT LM2023036; GA MŠMT EF16_013/0001789; GA MŠMT EF18_046/0015861; GA ČR(CZ) GA24-10435S
Institutional support: RVO:68378050
Keywords : iswi * mice * mechanisms * snf2h
OECD category: Hematology
Impact factor: 5.2, year: 2023
Method of publishing: Open access
https://www.nature.com/articles/s42003-024-05917-z

The formation of hematopoietic cells relies on the chromatin remodeling activities of ISWI ATPase SMARCA5 (SNF2H) and its complexes. The Smarca5 null and conditional alleles have been used to study its functions in embryonic and organ development in mice. These mouse model phenotypes vary from embryonic lethality of constitutive knockout to less severe phenotypes observed in tissue-specific Smarca5 deletions, e.g., in the hematopoietic system. Here we show that, in a gene dosage-dependent manner, the hypomorphic allele of SMARCA5 (S5tg) can rescue not only the developmental arrest in hematopoiesis in the hCD2iCre model but also the lethal phenotypes associated with constitutive Smarca5 deletion or Vav1iCre-driven conditional knockout in hematopoietic progenitor cells. Interestingly, the latter model also provided evidence for the role of SMARCA5 expression level in hematopoietic stem cells, as the Vav1iCre S5tg animals accumulate stem and progenitor cells. Furthermore, their hematopoietic stem cells exhibited impaired lymphoid lineage entry and differentiation. This observation contrasts with the myeloid lineage which is developing without significant disturbances. Our findings indicate that animals with low expression of SMARCA5 exhibit normal embryonic development with altered lymphoid entry within the hematopoietic stem cell compartment.
Permanent Link: https://hdl.handle.net/11104/0352849