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Targeting endogenous retrovirus gene transcription in human cancers
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Targeting endogenous retrovirus gene transcription in human cancers
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Targeting endogenous retrovirus gene transcription in human cancers
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Paper
Targeting endogenous retrovirus gene transcription in human cancers
2018
Overview
Endogenous retroviruses (ERVs) are remnants of ancient retroviral infections that make up to 8% of the human genome. Although these elements are mostly fragmented and inactive, many proviruses belonging to the HERV-K (HML-2) family, the only lineage still proliferating in the genome after the human-chimpanzee split, have intact open reading frames, some encoding for accessory genes called np9 and rec that interact with oncogenic pathways. Many studies have established that the transient expression of ERVs are in both stem cells and cancers results in aberrant self-renewal and uncontrolled proliferation. The wealth of high-quality genomic and transcriptomic Illumina sequence data available from The Cancer Genome Atlas (TCGA) that are sequenced from a diversity of different tumour types makes it a valuable resource in cancer research. However, there is currently no universal computational method for inferring expression of specific repetitive elements from RNA-seq data, such as genes encoded by HERV-K (HML-2). This study presents a novel and a highly specific pipeline that is able to capture and measure transcription of np9 and rec encoded by proviruses that share great sequence similarity, and are transcribed at very low levels. We show by using our novel methodology that np9 and rec are overexpressed in breast cancer, germ cell tumours, skin melanoma, lymphoma, ovarian cancer, and prostate cancer compared to non-diseased tissues. We also show that np9 and rec are specifically expressed in the 8 and 16-cell stage in human preimplantation embryos. Footnotes * Limitations statement added into Discussion.
