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Ribonucleic acid sequencing (RNA-Seq) libraries are normally prepared with oligo(dT) selection of poly(A)+ mRNA, but it depends on intact total RNA samples. Recent studies have described Ribo-Zero technology, a novel method that can capture both poly(A)+ and poly(A)- transcripts from intact or fragmented RNA samples. We report here the first application of Ribo-Zero RNA-Seq for the analysis of the bovine embryonic, neonatal, and adult skeletal muscle whole transcriptome at an unprecedented depth. Overall, 19,893 genes were found to be expressed, with a high correlation of expression levels between the calf and the adult. Hundreds of genes were found to be highly expressed in the embryo and decreased at least 10-fold after birth, indicating their potential roles in embryonic muscle development. In addition, we present for the first time the analysis of global transcript isoform discovery in bovine skeletal muscle and identified 36,694 transcript isoforms. Transcriptomic data were also analyzed to unravel sequence variations; 185,036 putative SNP and 12,428 putative short insertions-deletions (InDel) were detected. Specifically, many stop-gain, stop-loss, and frameshift mutations were identified that probably change the relative protein production and sequentially affect the gene function. Notably, the numbers of stage-specific transcripts, alternative splicing events, SNP, and InDel were greater in the embryo than in the calf and the adult, suggesting that gene expression is most active in the embryo. The resulting view of the transcriptome at a single-base resolution greatly enhances the comprehensive transcript catalog and uncovers the global trends in gene expression during bovine skeletal muscle development.

The developmental transcriptome landscape of bovine skeletal muscle defined by Ribo-Zero ribonucleic acid sequencing1