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Fig. 4. Morpholino knockdown of the rad21 gene phenocopies the nz171
mutation, both of which are rescued by injection of rad21 mRNA.
(A-I) rad21 morphants phenocopy the nz171 mutation. (D,G)
Embryos injected with antisense morpholino oligonucleotides targeting the
start codon (rad21 ATG MO; D) and 5' donor site of exon 3
(rad21 Splx3 MO; G) physically resemble nz171 mutants (example in A)
at 35 h.p.f. (B,E,H) pH3-labeled cells in rad21 morphants (E,H)
compared with wild type (B). Morphants exhibit increased numbers of cells in M
phase (black arrows). (C,F,I) runx1 expression in nz171 mutant (C)
and rad21 morphant embryos (F,I), shown alongside wild type (WT, wild
type; mut, nz171 mutant; MO, morphant). Reduced PLM runx1 expression
is indicated by white arrowheads. All views lateral, anterior to the left.
(J-O) The nz171 mutant phenotype is rescued by injection of a
rad21 mRNA. (J,K) The morphology of nz171 mutants approaches wild
type in rad21-injected embryos. (L-O) Expression of runx1 in
the PLM of flat-mounted 10-somite embryos, anterior to the left, dorsal views.
runx1 expression is absent from the PLM in nz171 (L) and virtually
absent in a rad21 morphant (M). runx1 expression is rescued
in the PLM after injection with zebrafish (N) or human (O) rad21
mRNA. See Fig. 5,
Fig. 6A for wild-type
expression of runx1.
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