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Volume 597, Issue 7 p. 947-961
Research Letter

Long noncoding RNAs are substrates for cytoplasmic capping enzyme

Avik Mukherjee

Avik Mukherjee

Institute of Health Sciences, Presidency University, Kolkata, India

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Safirul Islam

Safirul Islam

Institute of Health Sciences, Presidency University, Kolkata, India

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Rachel E. Kieser

Rachel E. Kieser

Center for RNA Therapeutics, Department of Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA

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Daniel L. Kiss

Daniel L. Kiss

Center for RNA Therapeutics, Department of Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, USA

Weill Cornell Medical College, New York, NY, USA

Houston Methodist Cancer Center, Houston, TX, USA

Houston Methodist Academic Institute, Houston, TX, USA

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Chandrama Mukherjee

Corresponding Author

Chandrama Mukherjee

Institute of Health Sciences, Presidency University, Kolkata, India

Correspondence

C. Mukherjee, Institute of Health Sciences, Presidency University, Plot No. DG/02/02, Premises No. 14-0358, Action Area 1D, Kolkata 700156, India

Tel: +919903950076

E-mail: [email protected]

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First published: 01 March 2023
Edited by Michael Ibba

Abstract

Cytoplasmic capping returns a cap to specific mRNAs, thus protecting uncapped RNAs from decay. Prior to the identification of cytoplasmic capping, uncapped mRNAs were thought to be degraded. Here, we test whether long noncoding RNAs (lncRNAs) are substrates of the cytoplasmic capping enzyme (cCE). The subcellular localisation of 14 lncRNAs associated with sarcomas were examined in U2OS osteosarcoma cells. We used 5′ rapid amplification of cDNA ends (RACE) to assay uncapped forms of these lncRNAs. Inhibiting cytoplasmic capping elevated uncapped forms of selected lncRNAs indicating a plausible role of cCE in targeting them. Analysis of published cap analysis of gene expression (CAGE) data shows increased prevalence of certain 5’-RACE cloned sequences, suggesting that these uncapped lncRNAs are targets of cytoplasmic capping.

Data accessibility

The CAGE data that support the findings of this study were mined from and are available in the ZENBU Genome Browser at ZENBU—genome browser (riken.jp). Summaries of, and links to the data sets used to gather all the CAGE data have been posted to Figshare and are available in the public domain at this link: https://doi.org/10.6084/m9.figshare.22080956.v1. Two tables at that link include the exact coordinates and links to obtain the data for each lncRNA presented in this manuscript and all the numerical data used to generate the CAGE graphs in the paper.