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© Research
Publication : Elife

Pitx2c orchestrates embryonic axis extension via mesendodermal cell migration

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Elife - 28 Jun 2018

Collins MM, Maischein HM, Dufourcq P, Charpentier M, Blader P, Stainier DY

Link to Pubmed [PMID] – 29952749

Elife. 2018 Jun 28;7. pii: e34880

Pitx2c, a homeodomain transcription factor, is classically known for its left-right patterning role. However, an early wave of pitx2 expression occurs at the onset of gastrulation in several species, indicating a possible earlier role that remains relatively unexplored. Here we show that in zebrafish, maternal-zygotic (MZ) pitx2c mutants exhibit a shortened body axis indicative of convergence and extension (CE) defects. Live imaging reveals that MZpitx2c mutants display less persistent mesendodermal migration during late stages of gastrulation. Transplant data indicate that Pitx2c functions cell non-autonomously to regulate this cell behavior by modulating cell shape and protrusive activity. Using transcriptomic analyses and candidate gene approaches, we identify transcriptional changes in components of the chemokine-ECM-integrin dependent mesendodermal migration network. Together, our results define pathways downstream of Pitx2c that are required during early embryogenesis and reveal novel functions for Pitx2c as a regulator of morphogenesis.