Kafida Michaela, Karela Maria, Giakountis Antonis
Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis, Mezourlo, 41500 Larissa, Greece.
Cancers (Basel). 2024 Jul 31;16(15):2728. doi: 10.3390/cancers16152728.
During the metagenomics era, high-throughput sequencing efforts both in mice and humans indicate that non-coding RNAs (ncRNAs) constitute a significant fraction of the transcribed genome. During the past decades, the regulatory role of these non-coding transcripts along with their interactions with other molecules have been extensively characterized. However, the study of long non-coding RNAs (lncRNAs), an ncRNA regulatory class with transcript lengths that exceed 200 nucleotides, revealed that certain non-coding transcripts are transcriptional "by-products", while their loci exert their downstream regulatory functions through RNA-independent mechanisms. Such mechanisms include, but are not limited to, chromatin interactions and complex promoter-enhancer competition schemes that involve the underlying ncRNA locus with or without its nascent transcription, mediating significant or even exclusive roles in the regulation of downstream target genes in mammals. Interestingly, such RNA-independent mechanisms often drive pathological manifestations, including oncogenesis. In this review, we summarize selective examples of lncRNAs that regulate target genes independently of their produced transcripts.
在宏基因组学时代,对小鼠和人类进行的高通量测序研究表明,非编码RNA(ncRNA)在转录基因组中占很大一部分。在过去几十年中,这些非编码转录本的调控作用及其与其他分子的相互作用已得到广泛研究。然而,对长链非编码RNA(lncRNA)的研究发现,某些非编码转录本是转录的“副产物”,其基因座通过RNA非依赖机制发挥下游调控功能。这类机制包括但不限于染色质相互作用以及复杂的启动子-增强子竞争模式,这些模式涉及潜在的ncRNA基因座及其新生转录本,在哺乳动物下游靶基因的调控中发挥重要甚至独特作用。有趣的是,这类RNA非依赖机制常常驱动包括肿瘤发生在内的病理表现。在本综述中,我们总结了一些lncRNA的精选实例,这些lncRNA独立于其产生的转录本调控靶基因。
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