Skip to main content
Analysis of TERT isoforms across TCGA, GTEx and CCLE datasets
  • Mathushan Subasri, Western University
  • Parisa Shooshtari, Ontario Institute for Cancer Research
  • Andrew J. Watson, Western University
  • Dean H. Betts, Western University
Document Type
Publication Date
URL with Digital Object Identifier

Reactivation of the multi-subunit ribonucleoprotein telomerase is the primary telomere maintenance mechanism in cancer, but it is rate-limited by the enzymatic component, telomerase reverse transcriptase (TERT). While regulatory in nature, TERT alternative splice variant/isoform regulation and functions are not fully elucidated and are further complicated by their highly diverse expression and nature. Our primary objective was to characterize TERT isoform expression across 7887 neoplastic and 2099 normal tissue samples using The Cancer Genome Atlas (TCGA) and the Genotype-Tissue Expression Project (GTEx), respectively. We confirmed the global overexpression and splicing shift towards full-length TERT in neoplastic tissue. Stratifying by tissue type we found uncharacteristic TERT expression in normal brain tissue subtypes. Stratifying by tumor-specific subtypes, we detailed TERT expression differences potentially regulated by subtype-specific molecular characteristics. Focusing on β-deletion splicing regulation, we found the NOVA1 trans-acting factor to mediate alternative splicing in a cancer-dependent manner. Of relevance to future tissue-specific studies, we clustered cancer cell lines with tumors from related origin based on TERT isoform expression patterns. Taken together, our work has reinforced the need for tissue and tumour-specific TERT investigations, provided avenues to do so, and brought to light the current technical limitations of bioinformatic analyses of TERT isoform expression.

Citation Information
Mathushan Subasri, Parisa Shooshtari, Andrew J. Watson and Dean H. Betts. "Analysis of TERT isoforms across TCGA, GTEx and CCLE datasets" Cancers Vol. 13 Iss. 8 (2021)
Available at: