The developmental stage of the medulloblastoma cell-of-origin restricts Sonic hedgehog pathway usage and drug sensitivity

Marlinde J Smit, Tosca E I Martini, Inna Armandari, Irena Bočkaj, Walderik W Zomerman, Eduardo S de Camargo Magalhães, Zillah Siragna, Tiny G J Meeuwsen, Frank J G Scherpen, Mirthe H Schoots, Martha Ritsema, Wilfred F A den Dunnen, Eelco W Hoving, Judith T M L Paridaen, Gerald de Haan, Victor Guryev, Sophia W M Bruggeman

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Samenvatting

Sonic hedgehog (SHH) medulloblastoma originates from the cerebellar granule neuron progenitor (CGNP) lineage, which depends on Hedgehog signaling for its perinatal expansion. Whereas SHH tumors exhibit overall deregulation of this pathway, they also show patient age-specific aberrations. To investigate whether the developmental stage of the CGNP can account for these age-specific lesions, we analyzed developing murine CGNP transcriptomes and observed highly dynamic gene expression as a function of age. Cross-species comparison with human SHH medulloblastoma showed partial maintenance of these expression patterns, and highlighted low primary cilium expression as hallmark of infant medulloblastoma and early embryonic CGNPs. This coincided with reduced responsiveness to upstream SHH pathway component Smoothened, whereas sensitivity to downstream components SUFU and GLI family proteins was retained. Together, these findings can explain the preference for SUFU mutations in infant medulloblastoma and suggest that drugs targeting the downstream SHH pathway will be most appropriate for infant patients.

Originele taal-2Engels
Artikelnummerjcs258608
TijdschriftJournal of cell science
Volume135
Nummer van het tijdschrift11
DOI's
StatusGepubliceerd - 1 jun. 2022

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