Interaction of bmp15 and gdf9 in zebrafish follicle development. (A) Histological analysis of bmp15 and gdf9 single and double mutants at 90 dpf. The follicles of some double mutants (gdf9-/-;bmp15-/-) could overcome the blockade at PG to enter early PV (PV-I) stage. (B) Partial rescue of vitellogenic growth in bmp15 and gdf9 single and double mutants by inha-/-. (C) Follicle distribution in different genotypes. Simultaneous mutation of inha-/- could rescue the follicle growth in both bmp15-/- and gdf9-/- to MV stage; however, further loss of inhbaa reduced it to EV stage. (D) Follicle composition in different genotypes and the data are shown as mean ± SEM (n = 3). Statistical analysis was performed with ANOVA followed by Tukey HSD for comparison with corresponding stages in the control fish (* P < 0.05; ** P < 0.01; *** P < 0.001). The proportion of PV-I follicles was significantly higher in the double mutant (gdf9-/-;bmp15-/-) than others especially gdf9-/- single mutant. The proportion of follicles at EV-FG stage (stage III) was lower in the triple mutants than the double mutant (gdf9-/-;bmp15-/-).
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