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Vol. 14, No. 13, pp. 1678-1690, July 1, 2000
Max Planck-Institut für Entwicklungsbiologie, D-72076
Tübingen, Germany
Somitogenesis has been linked both to a molecular clock that
controls the oscillation of gene expression in the presomitic mesoderm
(PSM) and to Notch pathway signaling. The oscillator, or clock,
is thought to create a prepattern of stripes of gene expression that
regulates the activity of the Notch pathway that subsequently
directs somite border formation. Here, we report that the zebrafish
gene after eight (aei) that is required for both
somitogenesis and neurogenesis encodes the Notch ligand DeltaD. Additional analysis revealed that stripes of her1 expression
oscillate within the PSM and that aei/DeltaD
signaling is required for this oscillation.
aei/DeltaD expression does not oscillate,
indicating that the activity of the Notch pathway upstream of
her1 may function within the oscillator itself. Moreover, we
found that her1 stripes are expressed in the anlage of
consecutive somites, indicating that its expression pattern is not
pair-rule. Analysis of her1 expression in
aei/DeltaD, fused somites (fss),
and aei;fss embryos uncovered a wave-front activity that is
capable of continually inducing her1 expression de novo in the
anterior PSM in the absence of the oscillation of her1. The
wave-front activity, in reference to the clock and wave-front model, is
defined as such because it interacts with the oscillator-derived
pattern in the anterior PSM and is required for somite morphogenesis.
This wave-front activity is blocked in embryos mutant for fss
but not aei/DeltaD. Thus, our analysis indicates
that the smooth sequence of formation, refinement, and fading of
her1 stripes in the PSM is governed by two separate activities.
[Key Words: Somitogenesis; Delta; her1; oscillator; wave front; zebrafish]
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