Inherited resilience to clonal hematopoiesis by modifying stem cell RNA regulation

Area of Science:

• Hematology
• Genetics
• Cancer Biology

Background:

• Somatic mutations in hematopoietic stem cells (HSCs) drive clonal hematopoiesis (CH), increasing blood cancer risk.
• Natural variations in CH progression suggest genetic factors conferring resilience.
• Understanding these factors can inform cancer prevention strategies.

Purpose of the Study:

• To identify genetic factors that protect against CH and myeloid malignancies.
• To elucidate the role of the RNA-binding protein MSI2 in HSC regulation and CH.
• To uncover the RNA network maintaining HSCs and influencing CH risk.

Main Methods:

• Identified a protective noncoding variant (rs17834140-T) associated with reduced MSI2 expression in HSCs.
• Modeled variant effects and mapped MSI2 RNA binding targets.
• Analyzed the impact of MSI2 levels on ASXL1-mutant HSC clonal dominance.

Main Results:

• The rs17834140-T variant was associated with slower CH expansion.
• MSI2 levels in HSCs were found to modify ASXL1-mutant HSC clonal dominance.
• An RNA network regulated by MSI2 was uncovered, maintaining human HSCs and influencing CH risk.

Conclusions:

• The rs17834140-T variant confers resilience against CH and myeloid malignancies by down-regulating MSI2.
• MSI2 and its RNA targets play a critical role in posttranscriptional regulation of human HSCs.
• Inhibiting MSI2 or its targets presents a potential strategy for blood cancer prevention.