ArticleVirus genes2022
Characterization of DNA methylation and promoter activity of long terminal repeat elements of feline endogenous retrovirus RDRS C2a.
Article in Virus genes, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Endogenous retroviruses (ERVs) are genomic elements derived from retroviral infections in ancestral germ lines. Most ERVs are inactivated by genetic or epigenetic mechanisms, such as DNA methylation. RD-114-virus-related sequence (RDRS) C2a is a feline endogenous retrovirus present in all domestic cats; however, its expression and function are not clearly known. DNA methylation at CpG dinucleotides is a hallmark of silenced ERVs. This study aimed to investigate whether long terminal repeats (LTRs) of RDRS C2a function as a gene regulatory region. The DNA methylation status of RDRS C2a was examined by bisulfite sequencing, and CpG sites in 5' LTR of RDRS C2a were found hypomethylated, whereas those in 3' LTR were hypermethylated in feline cells. Several transcription factor-binding sites were identified in LTRs of RDRS C2a. Luciferase assay suggested that 5' LTR of RDRS C2a exhibited strong transcriptional activity, which was suppressed by in vitro DNA methylation. The study indicates that 5' LTR of RDRS C2a possibly functions as a promoter for itself or neighboring genes.
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