Structure-Function Analysis of an Infantile Rhabdomyosarcoma Fusion-Oncogene Reveals Domain Requirements for Tumorigenesis

VGLL2::NCOA2 requires its VGLL2 TDU domain and NCOA2 AD1 domain to support nuclear localization, in vitro transformation, and tumorigenesis in a mouse allograft model.

• Why it matters: Fusion-driven infantile spindle cell rhabdomyosarcoma lacks therapies tailored to its molecular driver, despite VGLL2::NCOA2 being a common fusion oncogene in children under two.
• What they did: The study generated VGLL2::NCOA2 deletion mutants removing the TDU domain, NCOA2 AD1/AD2, or both TDU+AD1, then tested function in a mouse myoblast model and performed transcriptomic profiling.
• The result: TDU or AD1 mutant VGLL2::NCOA2 still upregulates myogenesis gene sets and supports terminal differentiation, implying domain-specific interactions that could be therapeutically targeted.

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