Modeling human RNA spliceosome mutations in the mouse: not all mice were created equal

Area of Science:

• Hematology
• Molecular Biology
• Genetics

Background:

• Myelodysplastic syndromes (MDS) and MDS/myeloproliferative neoplasms (MDS/MPNs) are clonal stem cell disorders affecting older adults.
• Recurrent heterozygous mutations in RNA splicing machinery genes (SF3B1, SRSF2, U2AF1) are frequently identified in MDS and MDS/MPNs.

Purpose of the Study:

• To review and analyze current murine models of spliceosomal gene mutations (SF3B1, SRSF2, U2AF1).
• To understand the in vivo contribution of spliceosomal mutations to MDS pathogenesis.
• To focus on genetic engineering and experimental methodologies in these models.

Main Methods:

• Review of recently reported murine models for SF3B1, SRSF2, and U2AF1 mutations.
• Analysis of genetic engineering techniques used to create these models.
• Evaluation of experimental approaches applied to study disease pathogenesis.

Main Results:

• Existing murine models recapitulate human MDS or MDS/MPN phenotypes to varying degrees.
• Differences in reported phenotypes can stem from genetic modification strategies and analysis methods.
• Conservation of hematopoiesis between mice and humans supports the utility of murine models.

Conclusions:

• Conditional murine models are essential for studying the pathogenesis of MDS and MDS/MPNs caused by spliceosomal mutations.
• Careful consideration of genetic modifications and experimental design is critical for accurate phenotyping.
• Further research using these models will advance our understanding of spliceosomal dysfunction in myeloid malignancies.