Fig. 3
Molecular characterization of ftk gene. (A) Chromosome map of the ftk locus on LG 7 between markers z1206 and z14888. An enlarged map (brown line) and overlapping BAC clones (blue lines) are shown below. (B) Missense mutation in the zebrafish cx36.7 gene of the ftk mutant. (C and D) Rescue of the ftk phenotype by cx36.7 mRNA injection. Embryos obtained from crosses of ftk heterozygotes and injected with cx36.7 mRNA (30 pg) did not show the ftk phenotype at 36 hpf (C). (Inset) Sibling uninjected ftk mutant at 28 hpf, which displays the growing pericardiac edema (arrow). Genotyping of mRNA-injected embryos by RFLP analysis confirmed that two of eight embryos were genotypically ftk mutants (res1, res2) (D). (E) Whole-mount in situ hybridization analysis of cx36.7 expression during heart development. (Insets) Orientation of embryos.