Spermatogenesis

of a seminiferous tubule showing various stages of spermatocyte developmentSpermatogenesis is the process by which male spermatogonia develop into mature spermatozoa. Spermatozoa are the mature male gametes in many sexually reproducing organisms. Thus, spermatogenesis is the male version of gametogenesis. In mammals it occurs in the male testes and epididymis in a stepwise fashion, and for humans takes approximately 64 days. Spermatogenesis is highly dependent upon optimal conditions for the process to occur correctly, and is essential for sexual reproduction. It starts at puberty and usually continues uninterrupted until death, although a slight decrease can be discerned in the quantity of produced sperm with increase in age. The entire process can be broken up into several distinct stages, each corresponding to a particular type of cell: (From the Wikpedia article Spermatogenesis.)

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Recent Publications on Spermatogenesis:
Immunohistochemical Localization of Steroidogenic Enzymes in the Testis of the Sika Deer (Cervus nippon) During Developmental and Seasonal Changes. Testicular steroidogenesis and spermatogenesis during developmental and...	21st November, 2009	Laboratory of Veterinary Anatomy, Department of Basic Veterinary Medicine,	J Reprod Dev. 2009 Nov 19.
Genetic Influences in Mouse Spermatogonial Stem Cell Self-Renewal. Spermatogonial stem cells (SSCs) are slowly dividing cells that undergo...	21st November, 2009	Department of Molecular Genetics, Graduate School of Medicine, Kyoto	J Reprod Dev. 2009 Nov 19.
Some Single Nucleotide Polymorphisms of the TSSK2 Gene May Be Associated with Human Spermatogenesis Impairment. Tssk2, a member of the testis specific serine/threonine kinase (TSSK)...	21st November, 2009		J Androl. 2009 Nov 19. DOI Direct Link
Analysis of Polymorphisms in the SRD5A2 Gene and Semen Parameters in Estonian Men. Spermatogenesis is an androgen-dependent process and polymorphisms in...	21st November, 2009		J Androl. 2009 Nov 19. DOI Direct Link
Trypsin is a multifunctional factor in spermatogenesis. Trypsin is well known as a pancreatic enzyme that is typically secreted...	21st November, 2009	Research Group for Reproductive Physiology, Southern Ehime Fisheries	Proc Natl Acad Sci U S A. 2009 Nov 19. DOI Direct Link
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BioNews Results for Spermatogenesis:
Normal Spermatogenesis in a Man with Mutant Luteinizing Hormone	Doctors Guide:  Nov 9 2009 4:40PM Matching: spermatogenesis
Normal Spermatogenesis in a Man with Mutant Luteinizing Hormone	MDLinx:  Nov 5 2009 10:24AM Matching: spermatogenesis
Brief Report: Normal Spermatogenesis in a Man with Mutant Luteinizing Hormone	New England Journal of Medicine:  Nov 4 2009 10:20PM Matching: spermatogenesis
TSPY1 Copy Number Variation Influences Spermatogenesis and Shows Differences among Y Lineages	MDLinx:  Oct 12 2009 12:49PM Matching: spermatogenesis

Spermatogenesis Patents:
US Patent No.	Title
7544696	Spermicidal and/or antifungal composition and methods of using the same
7569225	Immunogenic lipopeptides comprising T-helper and B-cell epitopes
7569237	Composition for enhancing male fertility
7572434	Method for assessing the effect of a drug on long term memory formation
7572820	Chemical compounds
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BioPortfolio Ltd. offers e-mail and postal lists for Spermatogenesis scientists - we have details of around 1710 individuals working on Spermatogenesis .