(A-C) Gross appearance and ovaries from wildtype (ar
+/+), heterozygous (ar
+/-) and homozygous (ar
-/-) (ar ihb1225/ihb1225) female zebrafish. At 4.5 mpf, the gross appearance of ar
-/- (ar ihb1225/ihb1225) female zebrafish was indistinguishable from wildtype siblings (ar
+/+) or their heterozygous sibling (ar
+/-), but the ovaries of ar
-/- female were smaller with fewer eggs and became transparent compared with wildtype sibling (ar
+/+) or heterozygous siblings (ar
+/-). (D) Gonadosomatic index (GSI) in ar
+/+ and ar
-/- female zebrafish. (E) Fertilization rate of eggs from wildtype (ar
+/+) and homozygous (ar
-/-) female zebrafish at 4mpf. (F, G) Histology of ovaries from wildtype (ar
+/+) and homozygous (ar
-/-) (ar ihb1225/ihb1225) zebrafish at 1.5 mpf. No obvious difference between ar
-/- and ar
+/+ ovaries. OC, Oocyte. (H, I) Histology of ovary from the wildtype (ar
+/+) and homozygous (ar
-/-) (ar ihb1225/ihb1225) zebrafish at 70 dpf. Ovaries of wildtype (ar
+/+), most oocytes developed to stage III and IV; but more ovaries of homozygous (ar
-/-) (M1) developed to stage II or I, some developed to stage III and IV. (J, K) Histology of ovaries from wildtype (ar
+/+) and homozygous (ar
-/-) zebrafish at 4 mpf. In ovaries of wildtype (ar
+/+), most oocytes developed to stage IV, but for ovaries of homozygous (ar
-/-), most oocytes developed to stage II and partial degeneration occurred. (L, M) Histology of ovaries from wildtype (ar+/+) and homozygous (ar
-/-) zebrafish at 4 mpf. In ovaries of homozygous (ar
-/-), follicles atresia and degeneration occurred. (N, O) Histology of ovaries from wildtype (ar
+/+) and homozygous (ar
-/-) zebrafish at 5 mpf. In ovaries of homozygous (ar
-/-), no follicles were observed and severe degeneration occurred (30%, n = 30). (P)
lhcgr (luteinizing homone/choriogonadotropin receptor) expression in ovaries of wildtype (ar+/+) and homozygous (ar-/-) zebrafish at 4.5 mpf. (Q)
foxl2 (forkhead box L2) expression in ovaries of wildtype (ar
+/+) and homozygous (ar
-/-) zebrafish at 4.5 mpf. (R)
cyp11a1 (p450 side chain cleavage enzyme) expression in ovaries of wildtype (ar+/+) and homozygous (ar
-/-) zebrafish at 4.5 mpf. (S)
kitlga expression in ovaries of wildtype (ar+/+) and homozygous (ar
-/-) zebrafish at 4.5 mpf injected with or without DHT (100 nM, 10μl for each). Dpf, days post fertilization; Mpf, months post fertilization.