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• W2008243402 endingPage "452" @default.
• W2008243402 startingPage "439" @default.
• W2008243402 abstract "•lncRNAs show weak selective constraint, even when clearly functional. •Gain and loss of lncRNA genes occurs at very high pace during evolution. •lncRNAs mostly evolve de novo. •Bidirectional promoters and transposable elements (TEs) promote the birth of lncRNAs. •Genomes rich in TEs may have more complex and malleable transcriptomes. Thousands of genes encoding long noncoding RNAs (lncRNAs) have been identified in all vertebrate genomes thus far examined. The list of lncRNAs partaking in arguably important biochemical, cellular, and developmental activities is steadily growing. However, it is increasingly clear that lncRNA repertoires are subject to weak functional constraint and rapid turnover during vertebrate evolution. We discuss here some of the factors that may explain this apparent paradox, including relaxed constraint on sequence to maintain lncRNA structure/function, extensive redundancy in the regulatory circuits in which lncRNAs act, as well as adaptive and non-adaptive forces such as genetic drift. We explore the molecular mechanisms promoting the birth and rapid evolution of lncRNA genes, with an emphasis on the influence of bidirectional transcription and transposable elements, two pervasive features of vertebrate genomes. Together these properties reveal a remarkably dynamic and malleable noncoding transcriptome which may represent an important source of robustness and evolvability. Thousands of genes encoding long noncoding RNAs (lncRNAs) have been identified in all vertebrate genomes thus far examined. The list of lncRNAs partaking in arguably important biochemical, cellular, and developmental activities is steadily growing. However, it is increasingly clear that lncRNA repertoires are subject to weak functional constraint and rapid turnover during vertebrate evolution. We discuss here some of the factors that may explain this apparent paradox, including relaxed constraint on sequence to maintain lncRNA structure/function, extensive redundancy in the regulatory circuits in which lncRNAs act, as well as adaptive and non-adaptive forces such as genetic drift. We explore the molecular mechanisms promoting the birth and rapid evolution of lncRNA genes, with an emphasis on the influence of bidirectional transcription and transposable elements, two pervasive features of vertebrate genomes. Together these properties reveal a remarkably dynamic and malleable noncoding transcriptome which may represent an important source of robustness and evolvability." @default.
• W2008243402 created "2016-06-24" @default.
• W2008243402 creator A5073997518 @default.
• W2008243402 creator A5085672556 @default.
• W2008243402 date "2014-10-01" @default.
• W2008243402 modified "2023-10-10" @default.
• W2008243402 title "Volatile evolution of long noncoding RNA repertoires: mechanisms and biological implications" @default.
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