Figure 2From: Fbxw7 regulates Notch to control specification of neural precursors for oligodendrocyte fatefbxw7 is the gene mutated by the vu56 allele. (A) Schematic representation of genetic mapping and sequencing results. The vu56 mutation mapped to a region of Chromosome 1 containing fbxw7. The vu56 mutation created an amino acid substitution within the second WD repeat of the predicted Fbxw7 protein. (B) Sequence traces from wild-type and vu56 mutant cDNAs. The vu56 mutation changed a G to an A, converting a BamHI restriction site to a HinfI site. (C) RFLP genotyping of homozygous wild type (+/+), heterozygous (+/−) and homozygous mutant (−/−) larvae. U = uncut, B = BamHI digest, H = HinfI digest. (D) RT-PCR analysis of fbxw7 mRNA splicing in control (Crtl) and fbxw7SSMO-injected (MO) 24 hpf embryos and 3 dpf larvae. Upper band in MO lanes (asterisks) indicates splice blocking products. (E) Sequence analysis of RT-PCR products from control embryos, which lack intron 4 sequence (dashed lines) and fbxw7SSMO-injected embryos, which retain intron 4 sequence. Underlined sequence is complementary to the splice-blocking morpholino. (F,G) Lateral images of 3 dpf uninjected control and fbxw7SSMO-injected larvae. Insets show corresponding bright field images. (H-I’) Transverse sections of 3 dpf uninjected control and fbxw7SSMO morpholino injected larvae showing Sox10 expression (red, arrowheads). Panels H’ and I’ show Sox10 labeling merged with olig2: EGFP (green). (J) Quantification of Sox10+ cells per section in control and fbxw7SSMO-injected larvae (n = 8 larvae each genotype; p = 0.0001). Error bars represent SEM.Back to article page