LINE-1 in cancer: multifaceted functions and potential clinical implications

Genetics in Medicine : Official Journal of the American College of Medical Genetics
Lu Xiao-JieMa Shi-Jie

Abstract

Long interspersed nuclear element-1 (L1) retrotransposons are jumping genes that comprise 17% of human DNA. They utilize a ''copy-and-paste'' mechanism to propagate themselves throughout the genome via RNA intermediates, a process termed retrotransposition. L1s are active in the germ line and during embryogenesis, yet they are epigenetically suppressed in somatic cells. In cancer cells, however, L1s are aberrantly activated and may have a role in genome instability, one of the hallmarks of cancer pathogenesis. Their methylation states and retrotransposition activities are associated with and fluctuate during cancer initiation and progression, thus representing promising diagnostic biomarkers and therapeutic targets. During tumorigenesis, L1s exert both retrotransposition-dependent and retrotransposition-independent functions. The former may result in alterations in target gene expression or chromosomal rearrangement, or drive Alu and SVA, events that could function in tumorigenesis, whereas the latter can potentially exert epigenetic regulation by generating endo-siRNAs, forming chimeric L1 transcripts or changing the expression of adjacent genes by providing novel splicing sites or alternative promoters. Moreover, the L1 encod...Continue Reading

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