1. Alternative RNA splicing modulates ribosomal composition and determines the spatial phenotype of glioblastoma cells
- Author
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Tatyana D. Larionova, Soniya Bastola, Tatiana E. Aksinina, Ksenia S. Anufrieva, Jia Wang, Victoria O. Shender, Dmitriy E. Andreev, Tatiana F. Kovalenko, Georgij P. Arapidi, Polina V. Shnaider, Anastasia N. Kazakova, Yaroslav A. Latyshev, Victor V. Tatarskiy, Alexander A. Shtil, Pascale Moreau, Francis Giraud, Chaoxi Li, Yichan Wang, Maria P. Rubtsova, Olga A. Dontsova, Michael Condro, Benjamin M. Ellingson, Mikhail I. Shakhparonov, Harley I. Kornblum, Ichiro Nakano, Marat S. Pavlyukov, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry (IBCh RAS), Russian Academy of Sciences [Moscow] (RAS), Institut de Chimie de Clermont-Ferrand (ICCF), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), and Université Clermont Auvergne (UCA)-Université Clermont Auvergne (UCA)
- Subjects
Gene Expression Regulation, Neoplastic ,Alternative Splicing ,Phenotype ,Brain Neoplasms ,RNA Splicing ,Cell Line, Tumor ,[CHIM]Chemical Sciences ,Humans ,Protein Isoforms ,RNA, Messenger ,Cell Biology ,Glioblastoma ,Ribosomes - Abstract
Glioblastoma (GBM) is characterized by exceptionally high intratumoral heterogeneity. However, the molecular mechanisms underlying the origin of different GBM cell populations remain unclear. Here, we found that the compositions of ribosomes of GBM cells in the tumour core and edge differ due to alternative RNA splicing. The acidic pH in the core switches before messenger RNA splicing of the ribosomal gene RPL22L1 towards the RPL22L1b isoform. This allows cells to survive acidosis, increases stemness and correlates with worse patient outcome. Mechanistically, RPL22L1b promotes RNA splicing by interacting with lncMALAT1 in the nucleus and inducing its degradation. Contrarily, in the tumour edge region, RPL22L1a interacts with ribosomes in the cytoplasm and upregulates the translation of multiple messenger RNAs including TP53. We found that the RPL22L1 isoform switch is regulated by SRSF4 and identified a compound that inhibits this process and decreases tumour growth. These findings demonstrate how distinct GBM cell populations arise during tumour growth. Targeting this mechanism may decrease GBM heterogeneity and facilitate therapy.
- Published
- 2022