ZFIN ID: ZDB-PUB-110518-46
Tumor suppressor Lzap regulates cell cycle progression, doming, and zebrafish epiboly
Liu, D., Wang, W.D., Melville, D.B., Cha, Y.I., Yin, Z., Issaeva, N., Knapik, E.W., and Yarbrough, W.G.
Date: 2011
Source: Developmental dynamics : an official publication of the American Association of Anatomists   240(6): 1613-1625 (Journal)
Registered Authors: Knapik, Ela W., Melville, David, Wang, Wen-Der
Keywords: lzap, zebrafish, epiboly, cell cycle, tumor suppressor
MeSH Terms:
  • Amino Acid Sequence
  • Animals
  • Animals, Genetically Modified
  • Cell Cycle/genetics*
  • Cell Movement/genetics*
  • Embryo, Nonmammalian
  • Genes, Tumor Suppressor/physiology
  • Intracellular Signaling Peptides and Proteins/genetics
  • Intracellular Signaling Peptides and Proteins/metabolism
  • Molecular Sequence Data
  • Morphogenesis/genetics
  • Morphogenesis/physiology
  • Nerve Tissue Proteins/genetics
  • Nerve Tissue Proteins/metabolism
  • Nerve Tissue Proteins/physiology*
  • Sequence Homology, Amino Acid
  • Time Factors
  • Tumor Suppressor Proteins/genetics
  • Tumor Suppressor Proteins/metabolism
  • Tumor Suppressor Proteins/physiology*
  • Zebrafish/embryology*
  • Zebrafish/genetics*
  • Zebrafish/metabolism
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism
  • Zebrafish Proteins/physiology*
PubMed: 21523853 Full text @ Dev. Dyn.

Initial stages of embryonic development rely on rapid, synchronized cell divisions of the fertilized egg followed by a set of morphogenetic movements collectively called epiboly and gastrulation. Lzap is a putative tumor suppressor whose expression is lost in 30% of head and neck squamous cell carcinomas. Lzap activities include regulation of cell cycle progression and response to therapeutic agents. Here, we explore developmental roles of the lzap gene during zebrafish morphogenesis. Lzap is highly conserved among vertebrates and is maternally deposited. Expression is initially ubiquitous during gastrulation, and later becomes more prominent in the pharyngeal arches, digestive tract, and brain. Antisense morpholino-mediated depletion of Lzap resulted in delayed cell divisions and apoptosis during blastomere formation, resulting in fewer, larger cells. Cell cycle analysis suggested that Lzap loss in early embryonic cells resulted in a G2/M arrest. Furthermore, the Lzap-deficient embryos failed to initiate epiboly—the earliest morphogenetic movement in animal development—which has been shown to be dependent on cell adhesion and migration of epithelial sheets. Our results strongly implicate Lzap in regulation of cell cycle progression, adhesion and migratory activity of epithelial cell sheets during early development. These functions provide further insight into Lzap activity that may contribute not only to development, but also to tumor formation.