Genetic and regenerative contexts specify distinct soft tissue sarcoma identities from Twist2+ progenitors.

Distinct soft tissue sarcoma subtypes arise from Twist2+ progenitors depending on genetic and microenvironmental cues, with UPS and FN-RMS driven by different pathways.

• Why it matters: Understanding how different sarcoma subtypes develop from common progenitors is crucial for improving diagnosis and targeted therapies, as their origins and mechanisms are poorly understood.
• What they did: The study used genetic manipulation and single-nucleus RNA sequencing on Twist2+ skeletal muscle progenitors to induce and compare UPS and FN-RMS, revealing their unique cellular states and developmental pathways.
• The result: Findings demonstrate that specific oncogenic and environmental factors steer progenitors toward distinct sarcoma identities, offering insights into developmental mechanisms and potential therapeutic targets for STS.