Abstract
The circular transcriptome of human glial cells is an area of neuroscience that has not been thoroughly elucidated. Circular RNAs (circRNAs) have the potential to facilitate the understanding of vast, complex and unknown mechanisms derived from the human transcriptome, including elements of the human brain that are not known and the evolution of the human brain, the complexities of which are not well understood. Moreover, the glial cells have been determined to contribute to human brain evolution. This study presents the first comprehensive analysis of the human brain glia circRNA transcriptome, that is, astrocytes, microglia and oligodendrocytes.After stringent criteria applied to the detection of circRNAs, it was found that the circular transcriptomes of these glia are unique from one another, and hence might be indicative of distinct roles for circRNAs within the brain. This study found 265, 239 and 442 circRNAs comprising the unique circular transcriptome of astrocytes, microglia and oligodendrocytes, respectively. The most abundant circRNAs in these glial cell types are expressed by parent genes co-expressing linear RNAs in low abundance, suggesting spliceosome activity favorable to the back-splicing mechanism instead of canonical splicing activity.
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