Mycn regulates vascular development through PI3K signaling pathway in zebrafish.

BACKGROUND

Mycn, a MYC gene family member, is implicated in both carcinogenesis through amplification and Feingold syndrome through its deficiency. Previous studies have indicated that increased Mycn expression enhances vascularization in human neuroblastomas, yet its precise role in vascular development remains elusive.

RESULTS

In this study, we utilized single-cell RNA-seq and live imaging analyses to confirm that mycn is expressed during zebrafish vasculogenesis. We investigated vascular development in zebrafish using a genetically engineered mycn mutation. Our findings reveal that mycn-deficient zebrafish exhibit reduced intersegmental vessels and malformed subintestinal vessels, primarily due to decreased cell proliferation in vascular endothelial cells. Importantly, we discovered that activation of PI3K signaling significantly ameliorates these vascular abnormalities.

CONCLUSIONS

Our study establishes Mycn as a key regulator of vascular development in zebrafish, acting through the PI3K signaling pathway.