Evidence that functional transcription units cover at least half of the human genome.
Transcriptome analyses have revealed that a large proportion of the human genome is transcribed. However, many of these transcripts might be functionless. To distinguish functional transcription units (FTUs) from spurious transcripts, we searched for the hallmarks of selective pressure against mutations that impair transcription. We analyzed the distribution of transposable elements, which are counter selected within FTUs. We show that these features are sufficiently informative to predict whether a sequence is transcribed and, if transcribed, in which orientation. Our results indicate that FTUs constitute at least 50% of the genome and that approximately one-third of these transcripts apparently do not encode proteins.
Sémon
Marie
M
Laboratoire de Biométrie et Biologie Evolutive, UMR CNRS 5558 Université Claude Bernard Lyon 1, 16 rue Raphaël Dubois, 69622 Villeurbanne Cedex, France.
Duret
Laurent
L
D004251:DNA Transposable Elements; D015894:Genome, Human; D006801:Humans; D008962:Models, Theoretical; D016376:Oligonucleotides, Antisense / Q000737:chemistry; D012313:RNA / Q000235:genetics; D014158:Transcription, Genetic
D004251:DNA Transposable Elements; D016376:Oligonucleotides, Antisense; D012313:RNA