The vertebrate nuclear hormone receptor steroidogenic factor 1 (SF1; NR5A1) controls reproductive development and regulates the transcription of steroid-modifying cytochrome P450 genes. We find that the SF1-related Drosophila nuclear hormone receptor HR39 is also essential for sexual development. In Hr39 mutant females, the sperm-storing spermathecae and glandular parovaria are absent or defect...

Spermiogenesis is a dynamic process which includes organelle reorganization and new structure formation. The morphology and distribution of the mitochondria in germ cells change to accommodate the cellular requirement. Multiple molecular motors and related proteins participate in carrying and anchoring mitochondria to the midpiece during spermiogenesis and this process is regulated precisely. E...

The generation of functional sperm in vitro has been a goal for almost a century. Until recently, researchers have only succeeded in reproducing the early steps of spermatogenesis. This is not surprising given that spermatogenesis is a complicated process that requires the coordinated efforts of germ cells and several somatic cells within the tubular structure of the testis. Finally-last year-S...

Understanding of biology of the avian male gamete is essential to improve the conservation of genetic resources and performances in farming. In this study, the semen proteome of the main domestic avian species (Gallus gallus) and evaluation of the molecular phenotype related to sperm quality were investigated using GeLC-MS/MS approach and label-free quantitative proteomic based on Spectral Coun...

HINTON, H. E. 198 1. Biology of Insect Eggs, Vol. 1. PARKER, G. A. 1970. Sperm competition and its evoPergamon, Oxford, U.K. lutionary consequences in insects. Biol. Rev. 45: MANS, R. J., AND G. D. NOVELLI. 196 1. Measurement 525-567. of the incorporation of radioactive amino acids into PROUT, T., AND J. BUNDGAARD. 1977. The populaprotein by a filter-paper disk method. Arch. Biotion genetics of...

The reproductive biology of Palythoa caribaeorum (Duchassaing & Michelotti 1860) and Protopalythoa variabilis (Duerden 1898) was studied through monthly samples from tagged colonies from June 1996 to June 1997, in Sao Sebastiao channel, São Paulo, Brazil (45 degrees 26'W, 23 degrees 50'S). The gametogenesis was similar to that of other zoanthids as shown by histological preparations. Oocyte dia...

Actin pushes in bizarre places ewis Tilney has always had a gift for looking for biology in strange places. His publishing history, he says, reads like a “Rogue’s gallery” of plants, fungi, parasites, and plenty of unusual invertebrate creatures. “It’s just ridiculous, and nowadays I couldn’t get away with it.” His colleagues say it is part of his genius to look in unusual systems to answer fun...

in some, ZP3 homologs are implicated as the key adhesion molecules, whereas in others, ZP2 homologs may play a dominant role (Topfer-Petersen et al., 1993). Although O-linked oligosaccharides on ZP3 are Dallas, Texas 75235 † Department of Cell Biology strongly implicated as being responsible for both sperm binding and signaling for the acrosome reaction, the University of Virginia Health Scienc...

*Corresponding author: Javad Baharara, Professor, Dept. of Biology & Research Center for Animal Development Applied Biology, Mashhad Branch, Islamic Azad University, Mashhad, Iran, Tel: + 98 5l1 8437092, Fax: + 98 511 8437092, Email: [email protected] Introduction Nowadays, the widespread use of various electrical and telecommunication appliances that produce electromagnetic fields is increasi...