Fig. 2
Failure of ovarian development occurs in brca2Q658X homozygotes during gonadal development. (A) Gonads from WT, brca2Q658X heterozygotes, and brca2Q658X homozygotes are indistinguishable at 21 dpf. (B) At 31 dpf, WT and brca2Q658X heterozygotes exhibit juvenile ovaries, early testicular differentiation, or early ovarian differentiation, whereas brca2Q658X homozygotes exhibit only early testicular differentiation. Perinucleolar oocytes in juvenile ovaries are indicated by short arrows; putative premeiotic germ cells are indicated by arrowheads. (C and D) At 41 and 51 dpf, WT and brca2Q658X heterozygotes exhibit continued maturation of testes or ovaries, whereas brca2Q658X homozygotes exhibit only testicular development. go, gonocyte; sgc, spermatogonial cyst; oc, oocyte; sc, spermatocyst; I, stage I oocyte; II, stage II oocyte. (Scale bars: 50 μm; 100 μm in 51 dpf ovaries.)