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Spermatozoa are more efficient at supporting normal embryonic development than spermatids, their immature, immediate precursors. This suggests that the sperm acquires the ability to support embryonic development during spermiogenesis spermatid to sperm maturation. Here, using Xenopus laevis as a model organism, we performed 2-D Fluorescence Difference Gel Electrophoresis 2D-DIGE and mass spectrometry analysis of differentially expressed proteins between sperm and spermatids in order to identify factors that could be responsible for the efficiency of the sperm to support embryonic development. Furthermore, benefiting from the availability of egg extracts in Xenopus , we also tested whether the chromatin of sperm could attract different egg factors compared to the chromatin of spermatids. Our analysis identified: 1 several proteins which were present exclusively in sperm; but not in spermatid nuclei and 2 numerous egg proteins binding to the sperm but not to the spermatid chromatin after incubation in egg extracts. Amongst these factors we identified many chromatin-associated proteins and transcriptional repressors.
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GERM CELL DIFFERENTIATION AND SEXUAL MATURATION
Spermatogenesis is the process of sperm cell development. Rounded immature sperm cells undergo successive mitotic and meiotic divisions spermatocytogenesis and a metamorphic change spermiogenesis to produce spermatozoa. Mitosis and meiosis. Mitosis is the process of cell duplication - two daughter cells are formed with exactly the same DNA and chromosomal content of the original diploid 2N mother cell.
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About Translations. This page introduces spermatogenesis the development of spermatozoa, the male haploid gamete cell. In humans at puberty, spermatozoa are produced by spermatogonia meiosis in the seminiferous tubules of the testis male gonad. A second process of spermiogenesis leads to change in cellular organisation and shape before release into the central lumen of the seminiferous tubule. This overall process has been variously divided into specific identifiable stages in different species: 6 in human, 12 in mouse, and 14 in rat.
Spermatogenesis is the process by which haploid spermatozoa develop from germ cells in the seminiferous tubules of the testis. This process starts with the mitotic division of the stem cells located close to the basement membrane of the tubules. The mitotic division of these produces two types of cells.