In vivo models of subclonal oncogenesis and dependency in hematopoietic malignancy

Area of Science:

• Oncology
• Genetics
• Molecular Biology

Background:

• Cancer evolution involves complex genetic and epigenetic changes driving cellular dysregulation.
• Existing experimental models lack the ability to dynamically perturb cancer evolution.
• Understanding clonal expansion requires robust systems to study sequential mutations.

Purpose of the Study:

• To develop and validate a novel experimental system for modeling sequential mutagenesis in cancer evolution.
• To investigate the cooperative effects of specific mutations (Flt3, Dnmt3a, Idh2, Npm1) in leukemogenesis.
• To explore the impact of mutation order and reversion on cancer progression and regression.

Main Methods:

• Integration of multi-recombinase tools for inducible and reversible sequential mutagenesis.
• Modeling premalignancy to leukemia transitions in experimental systems.
• Analysis of cellular and transcriptional landscapes following mutagenesis and reversion.

Main Results:

• Inducible Flt3 mutations showed differential cooperation with Dnmt3a, Idh2, and Npm1 mutations.
• The order of mutation introduction significantly altered cellular and transcriptional profiles.
• Reversion of mutations induced rapid leukemic regression with distinct differentiation patterns.

Conclusions:

• The developed system enables experimental modeling of sequential mutagenesis and oncogenic cooperation.
• Mutation order is critical in shaping cancer phenotypes and progression.
• Reversible genetic manipulation offers a potential therapeutic avenue for inducing cancer regression.