This fits the general principle of ZGA being triggered by a 'universal' Genome: Cytoplasm ratio across animals! - and thus a highly conserved mechanism involving titration of a maternal cytoplasmic factor on chromatin.
Cnidarian developmental mechanisms group
Then, what determines ZGA onset?? We correlated multiple genomic, developmental and ecological features with ZGA timing and, cutting to the chase, we found that the log ratio of genome size vs. egg volume very strongly scaled negatively with ZGA onset in cell cycles! 7/15
