exosc8 and exosc9 homozygous mutant zebrafish develop microcephaly.(A) Gross anatomy of 5-dpf wild-type, exosc8 homozygous mutant and exosc9 homozygous mutant zebrafish embryos; lateral view, anterior to the left. Scale bar: 500 μm. (B) Dorsal view of wild-type, exosc8 homozygous mutant and exosc9 homozygous mutant zebrafish embryos. Scale bar: 500 μm. (C, D, E) Standard length, (D) area of eyes, and (E) area of head in 5-dpf wild-type, exosc8 homozygous mutant and exosc9 homozygous mutant zebrafish embryos. 13 control, 8 exosc8 (c.26_27del), and 5 exosc9 (c.198_208del) homozygous larvae were measured for the quantification. Error bars represent the standard error (±SEM), and statistical analysis was performed using unpaired t tests (exosc8 versus wt and exosc9 versus wt, respectively). NS, not significant.
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