Rouven Hoefflin, Alissa C Greenwald, Noam Galili Darnell, Christopher W Mount, Yali Tiomkin, L Nicolas Gonzalez Castro, Zebin Wen, Dor Simkin, Angelica B Patterson, Inna Goliand, Ofra Golani, Liat Fellus-Alyagor, Marina Cohen, Kevin Joseph, Jürgen Beck, Vidhya M Ravi, Merav Kedmi, Hadas Keren-Shaul, Michael Weller, Yoseph Addadi, Marian C Neidert, Mario L Suvà, Itay Tirosh
Adult diffuse gliomas are composed of malignant cell states interwoven with the non-malignant brain microenvironment. Here, we combine spatial transcriptomics and spatial proteomics of isocitrate dehydrogenase (IDH)-mutant gliomas to define organizational principles across histological grades. In low-grade tumors, spatial organization is shaped by underlying brain anatomy. We identify a functional white-gray matter junction that restricts cortical invasion and is associated with marked changes in tumor composition and cellular phenotypes. This junction is preferentially traversed by oligodendrocyte progenitor (OPC)-like malignant cells, suggesting a role in tumor expansion. In contrast, tumors with intermediate histological features are largely disorganized, with few recurring interactions between cancer cell states and microenvironmental cell types. In high-grade tumors, hypoxia-associated structure emerges, resembling IDH-wild-type glioblastoma. Together, these findings reveal two independent axes of spatial organization-from anatomy-driven structure in low-grade tumors to hypoxia-driven organization in high-grade tumors-and establish a framework linking tumor grade to recurrent spatial interactions.