A new collaboration amongst scientists at different centres at the PRBB, with Mar Albà from the IMIM as leading author, has come up with a new mechanism for explaining the formation of de novo genes. Although commonly new genes arise by gene duplication and diversification of the copy, some genes appear in genomic regions which did not previously contain any gene, as compared with other species. How do these genes originate from nothing?
In a preprint submitted to arXiv.org the authors propose – based on transcriptomic comparisons between humans and three other mammals – that first new regulatory motifs/promoters appeared in those regions, which lead to an activation of transcription and the origin of new potentially functional genes. Alba’s group have actually identified hundreds of putative de novo genes in the human genome.