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Currently, there is much interest in intronic sequence-containing long non-coding RNAs and the role of intronic transcription in regulation of cellular metabolism and fate. Several stable intronic sequence RNAs (sisRNAs) were recently implicated in regulation of parental genes. To investigate transcription from introns of the RPE65 gene, we analyzed RNA-seq and Nanopore sequencing data from different cell models of human retinal pigment epithelium (RPE) and native bovine RPE. We discovered putative stable poly-adenylated transcripts with sequences corresponding to intronic regions of the RPE65 gene in the cytoplasm of RPE cells. These stable intronic sequences could be important for RPE65 transcription, splicing or translation. We also analyzed alternative splicing events in RPE65. Frequent exon skipping events involving exons 2, 3, and 7 were detected. The rate of these events was much higher in human RPE cell cultures compared with native RPE , consistent with lack of translation of RPE65 mRNA in cell cultures.

frontiers in genetics

Stable Intronic Sequences and Exon Skipping Events in the Human RPE65 Gene: Analysis of Expression in Retinal Pigment Epithelium Cells and Cell Culture Models