High levels of LINE-1 transposable elements expressed in Kaposi’s sarcoma-associated herpesvirus-related primary effusion lymphoma

Kaposi’s sarcoma-associated herpesvirus (KSHV, HHV-8) is a gamma herpesvirus associated with several human malignancies. Transposable elements (TEs) are ubiquitous in eukaryotic genomes, occupying about 45% of the human genome. TEs have been linked with a variety of disorders and malignancies, though the precise nature of their contribution to many of them has yet to be elucidated. Global transcriptome analysis for differentially expressed TEs in KSHV-associated primary effusion lymphoma (PEL) cells (BCBL1 and BC3) revealed large number of differentially expressed TEs. These differentially expressed TEs include LTR transposons, long interspersed nuclear elements (LINEs), and short interspersed nuclear elements (SINEs). Further analysis of LINE-1 (L1) elements revealed expression upregulation, hypo-methylation, and transition into open chromatin in PEL. In agreement with high L1

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