cDNA Cloning and Expression of the Bovine Factor in the Germline Alpha (FIGLA) Gene in Oocytes and Ovarian Follicles
The factor in the germline alpha (FIGLA) is a basic helix-loop-helix transcription factor that is essential for folliculogenesis and regulates expression of zona pellucida genes in mouse and human. But bovine homologue has not as yet been confirmed experimentally. Here, researchers present the first cDNA cloning and transcript expression analysis of the bovine FIGLA gene. Using RT-PCR and quantitative real-time PCR, researchers revealed that expression within adult cattle tissues is limited to the ovary. The researchers found that Germinal Vesicle (GV) oocytes, Metaphase II (MII) oocytes, 4 and 8 cell embryos, morula and blastocysts were all shown to express mRNA for FIGLA and expression were different in bovine oocytes and IVF embryos at different stages (p<0.05) with the highest expression in Germinal Vesicle (GV) oocytes and lower expression in 8 cells and blastocysts embryos. There was no difference in mRNA levels for FIGLA gene among bovine IVF, PA (Parthenogenetic Activated) and NT (Nuclear Transfer) blastocysts (p>0.05). In situ hybridization the FIGLA RNA was only localized in ovarian follicle. The persistence of FIGLA in adult cowes suggests that it may regulate additional pathways that are essential for bovine ovarian and embryonic development.