CircACVR2A(2-4) regulates stem cell pluripotency by uncoupling CDK-activating kinase functions.

CircACVR2A(2-4) regulates stem cell pluripotency by uncoupling CAK complex activity, affecting neuroectoderm differentiation and RNAPII phosphorylation.

• Why it matters: Understanding how circRNAs influence lineage specification can reveal new mechanisms controlling stem cell fate and potential therapeutic targets for neurodevelopmental disorders and cancers.
• What they did: The study profiled circRNA and mRNA expression during human embryonic stem cell differentiation, then used targeted silencing of circACVR2A(2-4) to assess its role in pluripotency and lineage bias, and investigated its molecular interactions and in vivo effects.
• The result: Depletion of circACVR2A(2-4) caused rapid loss of pluripotency and neuroectoderm bias, disrupted RNAPII pausing at neuroectodermal loci, impaired neuronal migration in mice, and reduced glioblastoma progression, revealing a circRNA-mediated mechanism modulating stem cell fate.