Fusion of TTYH1 with the C19MC microRNA cluster drives expression of a brain-specific DNMT3B isoform in the embryonal brain tumor ETMR

Nada Jabado, Jacek Majewski, Annie Huang and colleagues show that embryonal tumors with multilayered rosettes are characterized by a recurrent fusion of TTYH1 with the C19MC microRNA cluster. They further show that this fusion results in massive overexpression of a brain-specific isoform of DNMT3B, suggesting that this pediatric brain tumor is driven by epigenetic reactivation of an early developmental neurogenesis program.