期刊
BLOOD ADVANCES
卷 4, 期 23, 页码 5902-5914出版社
ELSEVIER
DOI: 10.1182/bloodadvances.2020002337
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资金
- Italian Ministry of Education, Universities, and Research grant PRIN 2017 [2017PPS2X4_003]
- AIRC, Milan, Italy Investigator Grant [2017 20052]
- Fondazione Umberto Veronesi, Milan, Italy
- Fund for Scientific Research Flanders and Concerted Research Action (GOA) of the Ghent University
- ERC St Grant Consolidator [311660]
- Saint-Louis Institute program [ANR-10IBHU-0002]
- MFAG [2018 21771]
- European Research Council (ERC) [311660] Funding Source: European Research Council (ERC)
Circular RNAs (circRNAs) are stable RNA molecules that can drive cancer through interactions with microRNAs and proteins and by the expression of circRNA encoded peptides. The aim of the study was to define the circRNA landscape and potential impact in T-cell acute lymphoblastic leukemia (T-ALL). Analysis by CirComPara of RNA-sequencing data from 25 T-ALL patients, immature, HOXA overexpressing, TLX1, TLX3, TAL1, or LMO2 rearranged, and from thymocyte populations of human healthy donors disclosed 68 554 circRNAs. Study of the top 3447 highly expressed circRNAs identified 944 circRNAs with significant differential expression between malignant T cells and normal counterparts, with most circRNAs displaying increased expression in T-ALL. Next, we defined subtype-specific circRNA signatures in molecular genetic subgroups of human T-ALL. In particular, circZNF609, circPSEN1, circKPNA5, and circCEP70 were upregulated in immature, circTASP1, circZBTB44, and circBACH1 in TLX3, circHACD1, and circSTAM in HOXA, circCAMSAP1 in TLX1, and circCASC15 in TAL-LMO. Backsplice sequences of 14 circRNAs ectopically expressed in T-ALL were confirmed, and overexpression of circRNAs in T-ALL with specific oncogenic lesions was substantiated by quantification in a panel of 13 human cell lines. An oncogenic role of circZNF609 in T-ALL was indicated by decreased cell viability upon silencing in vitro. Furthermore, functional predictions identified circRNA-microRNA gene axes informing modes of circRNA impact in molecular subtypes of human T-ALL.
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