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Topic: Spermiogenesis

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	Spermiogenesis
		elegans, spermiogenesis is the final maturation of sperm, when the cell builds its pseudopod, acquires the ability to crawl, and becomes capable of fertilizing an oocyte.
		Spermiogenesis of male spermatids is triggered upon mating.
		Spermiogenesis is a very rapid process; it only takes about 5 minutes to complete.
	www.mcb.arizona.edu /wardlab/spermio.html (310 words)

	Bioline International Official Site (site up-dated regularly)
		Ultrastructural aspects of spermatogenesis, spermiogenesis and of the mature spermatozoon of a microcotylid monogenean Metamicrocotyla macracantha parasite from Mugil liza, are described.
		Spermiogenesis - Spermiogenesis is characterized by the differentiation of the spermatids to spermatozoa.
		Ultrastructure of spermiogenesis, spermatozoa and the tegument in Astriaster sp.
	www.bioline.org.br /request?oc95120 (1664 words)

	Bioline International Official Site (site up-dated regularly)
		At the end of the spermiogenesis process, the ZD narrows, the collar membrane approaches and each spermatozoon is released from the residual mass of cytoplasm.
		The data obtained in the present study may contribute towards elucidating the phylogeny of the family Didymozoidae, given that differences in the processes of spermiogenesis and in ultrastructure of the spermatozoon were observed in members of the same family.
		Atypical spermiogenesis in a parasitic flatworm, Didymozoon (Trematoda: Digenea: Didymozoidae).
	www.bioline.org.br /request?oc01220 (1454 words)

	spermatogenesis
		The purpose of this section is to examine the subcategories of spermatogenesis: spermatocytogenesis, meiosis and spermiogenesis.
		Spermiogenesis is the period of morphological transformation as the round spermatids is reorganized into a spermatozoa.
		To demonstrate that spermiogenesis actually occurs find the following cell types: The ealiest cell you can identify is the newly formed round spermatids which does not yet have acrosomal granules.
	www.wisc.edu /ansci_repro/lab/lab8/spermatogenesis/spermatogenesis.html (351 words)

	Spermiogenesis - Wikipedia, the free encyclopedia
		Spermiogenesis is the creation of a spermatozoon from a spermatid.
		Spermiogenesis is the last stage of a process called spermatogenesis.
		During spermiogenesis, the spermatids begin to grow a tail, and develop a thickened mid-piece, where the mitochondria gather and form an axoneme.
	en.wikipedia.org /wiki/Spermiogenesis (168 words)

	Formation of the Cytoskeleton and Motile Apparatus in Spermatids of Marsilea
		Prime examples of stored proteins are the tubulins, which represent the bulk of the fiberous portion of the cytoskeleton and the ciliary axonemes; in both structures, the tubulin subunits are assembled into microtubules.
		New ß-tubulin is synthesized in these cells only late in spermiogenesis, when the spermatids are engaged in ciliary axoneme formation.
		Spermiogenesis in Marsilea vestita: a temporal correlation between centrin expression and blepharoplast differentiation.
	www.life.umd.edu /CBMG/faculty/wolniak/marsilea/index.html (2357 words)

	Spermatid organelles
		By the end of spermiogenesis, the nuclear envelope is totally differentiated with the exception of the portion called "redundant nuclear envelope" containing pores, and surrounding the "basal knobs" (most often two of them, located at the posterior part of the nucleus).
		By the end of spermiogenesis, the apical part of the perinuclear substance is differentiated as a perforatorium, containing dehydrated protein crystalloids.
		In late spermiogenesis, the annulus slips towards a more distal position, allowing the mitochondria to affix to the flagellum, forming a typical helix.
	www.tours.inra.fr /prc/internet/courtens/spermiogenese/pnsen.php (1231 words)

	Centrin Is Necessary for the Formation of the Motile Apparatus in Spermatids of Marsilea -- Klink and Wolniak 12 (3): ...
		(b) Spermiogenesis is initiated by placing the spore into an aqueous medium, and all of the development occurs within the spore wall.
		At 30-45 min after imbibition, there is a change in the organization of the cytoplasm: the plastids become aggregated along 1 side of the microspore and the nucleus becomes displaced toward the opposite side of the gametophyte.
		Hart, P.E., and Wolniak, S.M. Spermiogenesis in Marsilea vestita: a temporal correlation between centrin expression and blepharoplast differentiation.
	www.molbiolcell.org /cgi/content/full/12/3/761 (8519 words)

	Spermiogenesis Initiation in Caenorhabditis elegans Involves a Casein Kinase 1 Encoded by the spe-6 Gene -- Muhlrad and ...
		Spermiogenesis Initiation in Caenorhabditis elegans Involves a Casein Kinase 1 Encoded by the spe-6 Gene -- Muhlrad and Ward 161 (1): 143 -- Genetics
		Spermiogenesis Initiation in Caenorhabditis elegans Involves a Casein Kinase 1 Encoded by the spe-6 Gene
		Implication of negative regulation by the Hrr25 kinase in the vesicle budding from the endoplasmic reticulum.
	www.genetics.org /cgi/content/full/161/1/143 (5524 words)

	[No title]
		Spermatids undergo a dramatic change in form during spermiogenesis - into the streamline spermatozoa adapted for fertilization.
		Spermiogenesis involves nuclear condensation, formation of the acrosomal cap, and development of a tail.
		The acrosome is derived from the Golgi apparatus.
	www.uwyo.edu /wjm/repro/spermat.htm (1768 words)

	Cell cycle arrest allows centrin translation but not basal body formation during spermiogenesis in Marsilea -- Tsai and ...
		Spermiogenesis in the water fern Marsilea vestita is a rapid
		Hart, P. and Wolniak, S. Spermiogenesis in Marsilea vestita: a temporal correlation between centrin expression and blepharoplast differentiation.
		Myles, D. and Hepler, P. Spermiogenesis in the fern Marsilea vestita: microtubules, nuclear shaping, and cytomorphogenesis.
	jcs.biologists.org /cgi/content/full/114/23/4265 (5465 words)

	CAMB: Faculty: P. Jeremy Wang (Site not responding. Last check: 2007-11-04)
		Regulation of meiosis, DNA recombination, chromosome segregation, DNA double-strand break repair, chromosome synapsis, spermiogenesis, male contraception, male infertility in humans, molecular biology and genetics of spermatogonial stem cells.
		Our group is interested in studying the regulation of meiosis and spermiogenesis in mice and humans.
		Dr. Pan is studying the regulation of spermiogenesis by RNF17 and RNF17-binding proteins.
	www.med.upenn.edu /camb/faculty/ggr/wang.html (579 words)

	Cellular Localization of GABA and GABAB Receptor Subunit Proteins During Spermiogenesis in Rat Testis -- Kanbara et al. ...
		Golgi phase (A, E), late stage of cap phase (B, F), acrosome phase (C, G), and maturation phase (D, In late stage of spermiogenesis, the nucleus is highly condensed.
		Linkage of mannchette microtubules to the nuclear envelope and observations of the role of the manchette in nuclear shaping during spermiogenesis in rodents.
		Yoshinaga K, Tanii I, Oh-Ooka, Toshimori K. Changes in distribution and molecular weight of the acrosomal protein acrin2 (MC41) during guinea pig spermiogenesis and epididymal maturation.
	www.andrologyjournal.org /cgi/content/full/26/4/485 (3177 words)

	HANP1/H1T2, a Novel Histone H1-Like Protein Involved in Nuclear Formation and Sperm Fertility -- Tanaka et al. 25 (16): ...
		Use of stepwise subtraction to comprehensively isolate mouse genes whose transcription is up-regulated during spermiogenesis.
		Temporal association of protamine 1 with the inner nuclear membrane protein lamin B receptor during spermiogenesis.
		HILS1 is a sper-matid-specific linker histone H1-like protein implicated in chromatin remodeling during mammalian spermiogenesis.
	mcb.asm.org /cgi/content/full/25/16/7107 (6086 words)

	The role of histones in chromatin remodelling during mammalian spermiogenesis -- Govin et al. 271 (17): 3459 -- FEBS ... (Site not responding. Last check: 2007-11-04)
		The role of histones in chromatin remodelling during mammalian spermiogenesis -- Govin et al.
		spermiogenesis and furthermore in that of nucleosome disassembly
		In the late stages of spermiogenesis, transition proteins and protamines participate in constituting the final sperm chromatin structure (4).
	content.febsjournal.org /cgi/content/full/271/17/3459 (6248 words)

	All Mutant Strains - Reproductive Genomics - The Jackson Laboratory
		Histology evaluation: Abnormal spermiogenesis with accumulation of meiotic division-phase spermatocytes and degenerating round spermatids present in multinucleated cell bodies (see 1).
		Histology evaluation: Abnormal spermiogenesis with few elongated spermatids in some tubules (see 1), abnormal heads (see 2), abnormal spermatid elongation (see 3) and abnormal cells in the epididymal lumen (see 4).
		Histology evaluation: Abnormal spermiogenesis with abnormal shaped spermatid heads abundant in testis (see 1), few elongated spermatids in some tubules (see 2), severe spermatogenesis impairment in some tubules (see 3); abnormal cells in the epididymal lumen (see 4).
	reprogenomics.jax.org /all_mutants.html (885 words)

	Infertility with Defective Spermiogenesis in Mice Lacking AF5q31, the Target of Chromosomal Translocation in Human ...
		Late arrest of spermiogenesis and germ cell apoptosis in mice lacking the TBP-like TLF/TRF2 gene.
		Spermiogenesis and exchange of basic nuclear proteins are impaired in male germ cells lacking Camk4.
		Spermiogenesis deficiency in mice lacking the Trf2 gene.
	mcb.asm.org /cgi/content/full/25/15/6834 (6577 words)

	A Novel Family of Serine/Threonine Kinases Participating in Spermiogenesis -- Kueng et al. 139 (7): 1851 -- The Journal ...
		The molecular mechanisms regulating the spectacular cytodifferentiation observed during spermiogenesis are poorly understood.
		the molecular basis of spermiogenesis, however, is largely unknown.
		of spermiogenesis, and (c) is absent in released sperms.
	www.jcb.org /cgi/content/full/139/7/1851 (5345 words)

	The Testes
		The Green arrow is pointing to the region of the seminiferous tubule where Spermiogenesis takes place which is the differentiation of Spermatids to Spermatozoa (sperm).
		The spermeogenic cells develop in groups attached to each other and this is easily seen with the primary spermatocytes.
		The next type of cells are the Spermatids, (green arrows) which are located closest to the lumen and are rounded and sometimes have the heads of the Spermatozoa (fl arrows), imbedded into them as they are developing in spermiogenesis.
	www3.umdnj.edu /histsweb/lab16/lab16testis.html (850 words)

	Table of contents for Library of Congress control number 89022248
		Spermiogenesis: an introduction to the symposium D. Hamilton Part II.
		Tektin filaments in the structure and assembly of sperm flagellar microtubules R. Linck and M. Goggin 11.
		Mammalian spermiogenesis: assembly and fate of perinuclear theca constituents A. Bellve, K. Thomas, R. Chandrika, T. Wilkie and M. Simon 15.
	www.loc.gov /catdir/toc/cam027/89022248.html (396 words)

	The Olfactory Adenylyl Cyclase III Is Expressed in Rat Germ Cells during Spermiogenesis -- Gautier-Courteille et al. ...
		The Olfactory Adenylyl Cyclase III Is Expressed in Rat Germ Cells during Spermiogenesis -- Gautier-Courteille et al.
		The Olfactory Adenylyl Cyclase III Is Expressed in Rat Germ Cells during Spermiogenesis
		Leblond CP, Clermont Y 1952 Spermiogenesis of rat, mouse, hamster and guinea pig as revealed by the "periodic acid-fushin sulfurous" technique.
	endo.endojournals.org /cgi/content/full/139/5/2588 (7172 words)

	Spermiogenesis Deficiency in Mice Lacking the Trf2 Gene -- Zhang et al. 292 (5519): 1153 -- Science (Site not responding. Last check: 2007-11-04)
		Spermiogenesis Deficiency in Mice Lacking the Trf2 Gene -- Zhang et al.
		mice are sterile because of a severe defect in spermiogenesis.
		RNF17, a component of the mammalian germ cell nuage, is essential for spermiogenesis.
	www.sciencemag.org /cgi/content/abstract/292/5519/1153 (1295 words)

	Expression of protamine-1 and -2 mRNA during human spermiogenesis -- Steger et al. 6 (3): 219 -- Molecular Human ...
		Kleene, K.C., Distel, R.J. and Hecht, N.B. (1984) Translational regulation and coordinate deadenylation of a haploid mRNA during spermiogenesis in mouse.
		Kleene, K.C. (1989) Poly (A) shortening accompanies the activation of translation of five mRNAs during spermiogenesis in the mouse.
		Penttilä, T.L., Yuan, L., Mali, P., Höög, C. and Parvinen, M (1995) Haploid gene expression: temporal onset and storage patterns of 13 novel transcripts during rat and mouse spermiogenesis.
	molehr.oxfordjournals.org /cgi/content/full/6/3/219 (4418 words)

	Tisp40, a spermatid specific bZip transcription factor, functions by binding to the unfolded protein response element ...
		Shown are the locations of the epitope recognized by the anti-Tisp40 polyclonal antibody, the NLS (nuclear localization signal), the leucine zipper, the TM (transmembrane) domain, and the acidic domain in Tisp40ß.
		Guylain, B. (2002) Chromatin remodeling during spermiogenesis: a possible role for the transition proteins in DNA strand break repair.
		Haze, K., Yoshida, H., Yanagi, H., Yura, T. and Mori, K. (1999) Mammalian transcription factor ATF6 is synthesized as a transmembrane protein and activated by proteolysis in response to endoplasmic reticulum stress.
	www.genestocellsonline.org /cgi/content/full/10/6/575 (6724 words)

	FGFR-1 signaling is involved in spermiogenesis and sperm capacitation -- Cotton et al. 119 (1): 75 -- Journal of Cell ...
		FGFR-1 signaling is involved in spermiogenesis and sperm capacitation -- Cotton et al.
		FGFR-1 signaling is involved in spermiogenesis and sperm capacitation
		spermiogenesis is involved in the establishment of the machinery
	jcs.biologists.org /cgi/content/full/119/1/75 (6296 words)

	RNF17, a component of the mammalian germ cell nuage, is essential for spermiogenesis -- Pan et al. 132 (18): 4029 -- ...
		RNF17, a component of the mammalian germ cell nuage, is essential for spermiogenesis -- Pan et al.
		Five testis-specific genes (Act, Tp1, Prm1, Prm2 and Ldh3) and four key regulators of spermiogenesis (Crem, Trf2, Miwi and Tpap) were examined.
		is a novel key regulator of spermiogenesis in mice.
	dev.biologists.org /cgi/content/full/132/18/4029 (5715 words)

	Male Reproduction 4 Spermatogenesis
		There are three phases: (1) Spermatocytogenesis (Mitosis), (2) Meiosis, and (3) Spermiogenesis.
		During spermiogenesis, the acrosome forms, the flagellar apparatus forms, and most excess cytoplasm (the residual body) is separated and left in the Sertoli cell.
		Spermatozoa are released into the lumen of the seminiferous tubule.
	www.cvm.okstate.edu /instruction/mm_curr/histology/MR/HiMRP4.htm (807 words)

	Nanoprobes e-News Vol. 3 No. 8 (August 13, 2002)
		Gimenez-Bonafe and co-workers recently used gold labeling with Monomaleimido Nanogold® to localize and quantitate interprotamine disulfide bonds during spermiogenesis: they used the disappearance of Nanogold labeling as an indicator of the formation of disulfide bonds by cysteine residues.
		During the first step of spermiogenesis, protamines are found spread over very slightly condensed chromatin with their cysteines in a reactive state (protamine-cys-SH).
		Subsequently, they participate in the mechanism of fiber coalescence and finally, in the last step of spermiogenesis, the remaining free reactive -SH groups of cysteine form disulfide bonds, thus promoting a definitive stabilization of the nucleoprotein complex in the ripe sperm nucleus.
	www.nanoprobes.com /Vol3_Iss8.html (1666 words)

	Control of Membrane Fusion During Spermiogenesis and the Acrosome Reaction -- Ramalho-Santos et al. 67 (4): 1043 -- ...
		During spermiogenesis three major developmental processes occur: 1) the condensation of the nucleus, 2) the formation of the flagellum, and 3) the formation of the acrosome.
		A novel testicular protein, with sequence similarities to a family of lipid binding proteins, is a major component of the rat sperm perinuclear theca.
		Linkage of manchette microtubules to the nuclear envelope and observations of the role of the manchette in nuclear shaping during spermiogenesis in rodents.
	www.biolreprod.org /cgi/content/full/67/4/1043 (6881 words)

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