Maturation State-Specific Alternative Splicing in FLT3-ITD and NPM1 Mutated AML

Area of Science:

• Hematology
• Molecular Biology
• Oncology

Background:

• Acute Myeloid Leukemia (AML) genetics are increasingly understood, yet treatment outcomes remain suboptimal.
• Aberrant splicing is a key factor in hematological malignancies, particularly in AML.
• Splicing profiles linked to non-splicing factor mutations in AML are underexplored.

Purpose of the Study:

• To investigate differential splicing profiles associated with common AML mutations: FLT3-ITD and NPM1.
• To understand how these mutations influence gene expression and splicing in AML pathogenesis.
• To identify potential therapeutic targets by linking genetic aberrations to phenotypic features.

Main Methods:

• RNA-sequencing analysis of 382 primary AML samples.
• Comparison of splicing profiles in AML with FLT3-ITD and/or NPM1 mutations.
• Functional analysis of differentially spliced and expressed genes.

Main Results:

• Co-occurrence of FLT3-ITD and mutated NPM1 is linked to differential splicing of FAB-type specific gene sets.
• Primary affected functions include cell cycle control and DNA damage response across FAB types.
• Functional divergence observed between spliced and expressed genes, with differential expression impacting hematopoietic differentiation.

Conclusions:

• Concomitant FLT3-ITD and mutated NPM1 are associated with maturation state-specific differential splicing.
• These splicing alterations affect genes with potential oncogenic relevance in AML.
• Findings suggest novel therapeutic strategies targeting aberrant splicing in AML.