Oocyte surface in four teleost fish species postspawning and fertilization

Leptin in Teleost Fish

MicroRNA in Teleost Fish

MicroRNAs (miRNAs) are transcriptional and posttranscriptional regulators involved in nearly all known biological processes in distant eukaryotic clades. Their discovery and functional characterization have broadened our understanding of biological regulatory mechanisms in animals and plants. They show both evolutionary conserved and unique features across Metazoa. Here, we present the current ...

Fertilization failure and oocyte activation.

Recent reports have suggested that when unfertilized oocytes with a spermatozoon after intracytoplasmic sperm injection (ICSI) are properly activated, the activated oocytes develop normally similar to fertilized oocytes. However, human oocytes do not easily respond to universal activators of mammalian oocytes like ethanol or calcium ionophore A23187, which induce a calcium transient in ooplasm....

In vitro oocyte maturation and fertilization.

Complete functional oocyte maturation involves many complex processes that occur within preovulatory follicles and are initiated and sustained by the gonadotropins, steroid hormones and many recognized and unrecognized factors. The product of oocyte maturation is a mature egg that has complete nuclear, plasma membrane and cytoplasmic changes that enable normal fertilization and subsequent devel...

Control of oocyte meiotic maturation and fertilization.

Sexual reproduction depends upon meiosis for the generation of haploid gamete nuclei, which unite after fertilization to form the diploid zygote. The oocytes of most animal species arrest during meiotic prophase, and complete meiosis in response to intercellular signaling in a process called meiotic maturation. Oocyte meiotic maturation is defined by the transition between diakinesis and metaph...