| Summary: | It is widely accepted that phenotypic traits can be modulated at the epigenetic level so that some conditions can affect the progeny of exposed individuals. To assess if the exposure of adult animals could result in effects on the offspring, the Mediterranean sea urchin and its well-characterized gene regulatory networks (GRNs) was chosen as a model. Adult animals were exposed to known concentrations of zinc and cadmium (both individually and in combination) for 10 days, and the resulting embryos were followed during the development. The oxidative stress occurring in parental gonads, embryo phenotypes and mortality, and the expression level of a set of selected genes, including members of the skeletogenic and endodermal GRNs, were evaluated. Increased oxidative stress at F<sub>0</sub>, high rates of developmental aberration with impaired gastrulation, in association to deregulation of genes involved in skeletogenesis (<i>dri, hex, sm50, p16, p19, msp130</i>), endodermal specification (<i>foxa, hox11/13b, wnt8) </i>and epigenetic regulation (<i>kat2A</i>, <i>hdac1, </i>e<i>hmt2, phf8 </i>and<i> UBE2a</i>) occurred either at 24 or 48 hpf. Results strongly indicate that exposure to environmental pollutants can affect not only directly challenged animals but also their progeny (at least F<sub>1</sub>), influencing optimal timing of genetic programme of embryo development, resulting in an overall impairment of developmental success.
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