In “Nature Communications,” Max Delbrück Center researchers show how immune cells initiate zebrafish heart regeneration, highlighting the possibility that precisely timed inflammatory signaling of specific immune cells — rather than broad suppression — could inform new approaches to cardiac repair.

Dürre und Hitzestress sowie Überschwemmungen und Starkregen verändern den Wasserkreislauf erheblich und haben gravierende Folgen für Menschen, Wirtschaft

This study maps the immediate transcriptional response after zebrafish heart injury and shows that fine-tuning early immune signals can further improve regeneration.

MicroRNAs (miRNAs) are key post-transcriptional regulators of cell state transitions, yet their function in early human brain development is largely unknown. Here, we present a longitudinal analysis of miRNA function in developing human forebrain organoids. We show that mRNAs and miRNAs expression mirrors known developmental gene programs and that miRNA biogenesis peaks at neural commitment. To test the function of miRNAs in regulating commitment, we impaired their biogenesis at defined stages. miRNA disruption during pre-neuronal commitment caused severe patterning defects, whereas post-commitment perturbation had minimal impact on forebrain identity. We show that miRNA loss during pre-commitment increased WNT and BMP signaling, thus shifting cell fates towards non-forebrain identity such as midbrain/hindbrain. These effects could be partially rescued by expressing five miRNAs. Our findings uncover a critical time window where miRNAs regulate morphogen signaling in early human neurodevelopment, establishing them as essential temporal determinants of cell fate and brain regional identity. ### Competing Interest Statement The authors have declared no competing interest.