Cre RNA expression in Tg(zp3:cre, krt8:rfp) transgenic zebrafish. A,B: cre RNA expression in 2-72 hours postfertilization (hpf) embryos (A) and in adult transgenic fish (B) as detected by reverse transcriptase-polymerase chain reaction (RT-PCR). Embryonic stages in hpf (A) and tissue sources (B) are indicated at the top of each lane. Whole-male transgenic fish (WFB) and selected tissues from female transgenic fish were used for RNA preparation. P, positive control with pZP3-CRE plasmid; N, negative control without template. β-actin probes were used for RT-PCR control. C,D: Ovary expression of cre mRNA in Tg(zp3:cre, krt8:rfp) transgenic female (C) and zp3 mRNA wild-type female (D). Whole-mount in situ hybridization detection was performed with isolated ovary tissues and both cre and zp3 mRNAs were detected in developing oocytes (arrows) but not in the mature oocyte.
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