Fgf4 maintains Hes7 levels critical for normal somite segmentation clock function

eLife

Matthew J Anderson¹  Mark Lewandoski¹  Ryoichiro Kageyama²  Valentin Magidson³ 

[1] Genetics of Vertebrate Development Section, Cancer and Developmental Biology Laboratory, National Cancer Institute, National Institutes of Health, Frederick, United States;Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan;Optical Microscopy and Analysis Laboratory, Frederick National Laboratory for Cancer Research, Frederick, United States;

关键词: fibroblast growth factor;    Notch;    segmentation clock;    somitogenesis;    hybridization chain reaction;    axis extension;   

DOI  :  10.7554/eLife.55608

来源: DOAJ

【 摘 要 】

During vertebrate development, the presomitic mesoderm (PSM) periodically segments into somites, which will form the segmented vertebral column and associated muscle, connective tissue, and dermis. The periodicity of somitogenesis is regulated by a segmentation clock of oscillating Notch activity. Here, we examined mouse mutants lacking only Fgf4 or Fgf8, which we previously demonstrated act redundantly to prevent PSM differentiation. Fgf8 is not required for somitogenesis, but Fgf4 mutants display a range of vertebral defects. We analyzed Fgf4 mutants by quantifying mRNAs fluorescently labeled by hybridization chain reaction within Imaris-based volumetric tissue subsets. These data indicate that FGF4 maintains Hes7 levels and normal oscillatory patterns. To support our hypothesis that FGF4 regulates somitogenesis through Hes7, we demonstrate genetic synergy between Hes7 and Fgf4, but not with Fgf8. Our data indicate that Fgf4 is potentially important in a spectrum of human Segmentation Defects of the Vertebrae caused by defective Notch oscillations.

【 授权许可】

Unknown