Abstract
Parallels between phylogeny and ontogeny have been discussed for almost two centuries, and a number of theories have been proposed to explain such patterns1. Especially elusive is the phylotypic stage, a phase during development where species within a phylum are particularly similar to each other2, 3, 4, 5, 6. Although this has formerly been interpreted as a recapitulation of phylogeny1, it is now thought to reflect an ontogenetic progression phase2, where strong constraints on developmental regulation and gene interactions exist2, 3. Several studies have shown that genes expressed during this stage evolve at a slower rate, but it has so far not been possible to derive an unequivocal molecular signature associated with this stage7, 8, 9, 10, 11, 12, 13, 14, 15. Here we use a combination of phylostratigraphy16 and stage-specific gene expression data to generate a cumulative index that reflects the evolutionary age of the transcriptome at given ontogenetic stages. Using zebrafish ontogeny and adult development as a model, we find that the phylotypic stage does indeed express the oldest transcriptome set and that younger sets are expressed during early and late development, thus faithfully mirroring the hourglass model of morphological divergence2, 3. Reproductively active animals show the youngest transcriptome, with major differences between males and females. Notably, ageing animals express increasingly older genes. Comparisons with similar data sets from flies and nematodes show that this pattern occurs across phyla. Our results indicate that an old transcriptome marks the phylotypic phase and that phylogenetic differences at other ontogenetic stages correlate with the expression of newly evolved genes.
