Patil, V and Pal, J and Mahalingam, K and Somasundaram, K (2020) Global RNA editome landscape discovers reduced RNA editing in glioma: Loss of editing of gamma-amino butyric acid receptor alpha subunit 3 (GABRA3) favors glioma migration and invasion. In: PeerJ, 8 .
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Abstract
Background: Gliomas are the most common and lethal type of intracranial tumors. With the current treatment regime, the median survival of patients with grade IV glioma (glioblastoma/GBM) remains at 14�16 months. RNA editing modifies the function and regulation of transcripts. The development of glial tumors may be caused by altered RNA editing events. Methods: In this study, we uncover the global RNA editome landscape of glioma patients from RNA-seq data of control, lower grade glioma (LGG) and GBM samples (n = 1,083). Results: A-to-I editing events were found to comprise 80 of the total editing events of which 96 were located in the Alu regions. The total RNA editing events were found to be reduced in glioma compared to control samples. More specifically, we found Gamma-aminobutyric acid type A receptor alpha3 (GABRA3) to be edited (c.1026 A-to-G; pI343M) in 73 (editing ratio 0.8) of control samples compared to LGG (28.96; 0.47) and GBM (5.2; 0.53) samples. GABRA3 transcript level was found to be downregulated in glioma compared to control in a grade-specific manner with GBMs having the lowest level of the transcript. Further, GABRA3 transcripts were observed to be higher in edited compared to unedited glioma samples. The transcript and protein levels of exogenously expressed gene were found to be higher for edited compared to unedited GABRA3 in glioma cells. Further, exogenously expressed edited GABRA3 inhibited migration and invasion of glioma cells efficiently but not the unedited GABRA3. Conclusion: Collectively, our study discovered a reduction in RNA editing during glioma development. We further demonstrate that elevated RNA editing maintains a high level of GABRA3 RNA and protein in normal glial cells which provides a less migratory environment for the normal functioning of the brain. In contrast, the reduction in GABRA3 protein levels, due to lower stability of unedited RNA, results in the loss of function which confers an aggressive phenotype to GBM tumor. Copyright 2020 Patil et al.
| Item Type: | Journal Article |
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| Publication: | PeerJ |
| Publisher: | PeerJ Inc. |
| Additional Information: | The copyright for this article belongs to Authors |
| Keywords: | 4 aminobutyric acid A receptor alpha3; complementary DNA; formaldehyde; kanamycin; lipofectamine, Article; cell adhesion; cell invasion; cell migration; DNA polymorphism; down regulation; Escherichia coli; gene expression; gene mutation; gene ontology; gene overexpression; genetic transfection; glia cell; glioma; hierarchical clustering; high throughput sequencing; human; human cell; mutagenesis; pathogenesis; phenotype; polyacrylamide gel electrophoresis; protein isolation; protein localization; protein structure; real time polymerase chain reaction; RNA editing; RNA isolation; RNA sequence; Sanger sequencing; synaptic transmission; transwell assay; tumor growth; tumor invasion; upregulation; Western blotting; whole exome sequencing |
| Department/Centre: | Division of Biological Sciences > Microbiology & Cell Biology |
| Date Deposited: | 21 Sep 2021 09:30 |
| Last Modified: | 21 Sep 2021 09:30 |
| URI: | http://eprints.iisc.ac.in/id/eprint/67379 |
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