Definitive hematopoiesis is dispensable to sustain erythrocytes and macrophages during zebrafish ontogeny

Ramy Elsaid, Aya Mikdache, Keinis Quintero Castillo, Yazan Salloum, Patricia Diabangouaya, Gwendoline Gros, Carmen G. Feijoo, Pedro P. Hernández

Research output: Contribution to journalArticlepeer-review


In all organisms studied, from flies to humans, blood cells emerge in several sequential waves and from distinct hematopoietic origins. However, the relative contribution of these ontogenetically distinct hematopoietic waves to embryonic blood lineages and to tissue regeneration during development is yet elusive. Here, using a lineage-specific “switch and trace” strategy in the zebrafish embryo, we report that the definitive hematopoietic progeny barely contributes to erythrocytes and macrophages during early development. Lineage tracing further shows that ontogenetically distinct macrophages exhibit differential recruitment to the site of injury based on the developmental stage of the organism. We further demonstrate that primitive macrophages can solely maintain tissue regeneration during early larval developmental stages after selective ablation of definitive macrophages. Our findings highlight that the sequential emergence of hematopoietic waves in embryos ensures the abundance of blood cells required for tissue homeostasis and integrity during development.

Original languageEnglish
Article number108922
Issue number2
Publication statusPublished - 16 Feb 2024


  • Biological sciences
  • Developmental biology
  • Embryology

ASJC Scopus subject areas

  • General


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