Polyadenylation sites and their characteristics in the genome of channel catfish (Ictalurus punctatus) as revealed by using RNA-Seq data

Publication date: Available online 26 March 2019Source: Comparative Biochemistry and Physiology Part D: Genomics and ProteomicsAuthor(s): Suxu Tan, Wenwen Wang, Tao Zhou, Yujia Yang, Dongya Gao, Rex Dunham, Zhanjiang LiuAbstractPolyadenylation plays important roles in gene expression regulation in eukaryotes, which typically involves cleavage and poly(A) tail addition at the polyadenylation site (PAS) of the pre-mature mRNA. Many eukaryotic genes contain more than one PASs, termed as alternative polyadenylation (APA). As a crucial post-transcriptional regulation, polyadenylation affects various aspects of RNA metabolism such as mRNA stability, translocation, and translation. However, polyadenylation has been rarely studied in teleosts. Here we conducted polyadenylation analysis in channel catfish, a commercially important aquaculture species around the world. Using RNA-Seq data, we identified 20,320 PASs which were classified into 14,500 clusters by merging adjacent PASs. Most of the PASs were found in 3′ UTRs, followed by intron regions based on the annotation of channel catfish reference genome. No apparent difference in PAS distribution was observed between the sense and antisense strand of the channel catfish genome. The sequence analysis of nucleotide composition and motif around PASs yielded a highly similar profile among various organisms, suggesting the conservation and importance of polyadenylation in evolution. Using APA genes with more than two PASs, gene ontolog...
Source: Comparative Biochemistry and Physiology Part D: Genomics and Proteomics - Category: Genetics & Stem Cells Source Type: research