A Genome-wide Map of Circular RNAs in Adult Zebrafish

Overview

Journal Sci Rep

Specialty Science

Date 2019 Mar 7

PMID 30837568

Citations 11

Authors

Disha Sharma

Paras Sehgal

Samatha Mathew

Shamsudheen Karuthedath Vellarikkal

Angom Ramcharan Singh

Shruti Kapoor

Rijith Jayarajan

Vinod Scaria

Sridhar Sivasubbu

Affiliations

Soon will be listed here.

Abstract

Circular RNAs (circRNAs) are transcript isoforms generated by back-splicing of exons and circularisation of the transcript. Recent genome-wide maps created for circular RNAs in humans and other model organisms have motivated us to explore the repertoire of circular RNAs in zebrafish, a popular model organism. We generated RNA-seq data for five major zebrafish tissues - Blood, Brain, Heart, Gills and Muscle. The repertoire RNA sequence reads left over after reference mapping to linear transcripts were used to identify unique back-spliced exons utilizing a split-mapping algorithm. Our analysis revealed 3,428 novel circRNAs in zebrafish. Further in-depth analysis suggested that majority of the circRNAs were derived from previously well-annotated protein-coding and long noncoding RNA gene loci. In addition, many of the circular RNAs showed extensive tissue specificity. We independently validated a subset of circRNAs using polymerase chain reaction (PCR) and divergent set of primers. Expression analysis using quantitative real time PCR recapitulate selected tissue specificity in the candidates studied. This study provides a comprehensive genome-wide map of circular RNAs in zebrafish tissues.

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