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Spermatogenesis in Medical News

Penn vet researchers identify a critical growth factor that stimulates sperm stem cells to thrive

...ades focused on spermatogonial stem cells, SSCs, that are the foundation of spermatogenesis and production of spermatozoa in the testes of adult males, whether man or ...s of a newborn male mouse supported stem cells and their ability to produce spermatogenesis much better than the niche in the mature adult male testis. In subsequent s...

Living with females extends the reproductive life of the male mouse, says Penn veterinary researcher

...wn. Histological analysis indicated that abnormal spermatogenesis occurred sooner in isolated males, suggesting that defects in spermatogenesis may play a role in the greater decrease in fertili...m cell and its differentiation to produce complete spermatogenesis better than the niche in the mature adult male tes...

Internationally adopted children hit puberty earlier

...vokes the secretion of GnRH (Gonadotropin Releasing Hormone). This hormone regulates the development of ovulation and the menstrual cycle in women and spermatogenesis in men. Therefore, a radical change in diet, as is often observed in children migrating to an industrialized country, can trigger puberty. "And man...

Male Contraceptive Drug - Non Hormonal Alternative

... Studies on rats have also shown that there are no serious side effects on the heart, kidney, lungs and other vital organs in the long term. During spermatogenesis when sperms are being manufactured in the testes, they are helped in their development into mature sperm by special tissue called Sertoli cells. Adher...

Vasectomy Reversal to Lead to Birth Defects

...loidy and diploidy, we would know that obstruction by vasectomy must affect spermatogenesis in the longer term.' However discrepancies in abnormalities in the sper...place was noted. 'This study raises a lot of questions. Is the abnormal spermatogenesis reversible, and if so, how long will it take before things get back to norm...

Decline in Paternity Rates Following Treatment for Testicular Cancer

...ty or infertility can be associated with the disease itself or with its treatment. Approximately half of all testicular cancer patients have defective spermatogenesis at diagnosis, even before orchiectomy. Researchers from Norway assessed post-treatment paternity among long-term survivors of testicular cancer wh...
Spermatogenesis in Biological News

New potential therapeutic target discovered for genetic disorder -- Barth syndrome

...a, and poor motor function. In this new study researchers documented that tafazzin or cardiolipin deficiency in Drosophila disrupts the final stage of spermatogenesis causing male sterility. Using this fly model, the study showed that this trait of cardiolipin deficiency can be genetically suppressed by inactivating...

October 2008 Biology of Reproduction highlights

... paper on p. 696 of this issue, Maatouk et al. add important new information to the emerging story by demonstrating that DICER1 is required for normal spermatogenesis in the mouse. These authors used a conditional knockout (CKO) approach to delete Dicer1 in the germline. Because the CKO mice exhibited transient fe...

Stem cell chicken and egg debate moves to unlikely arena: the testes

...rates is that once a fly becomes an adult, some stem cells that function in spermatogenesis start making the very cells that support them," said Jones. "Once a fly dev...tes stem cell interactions within the niche." Jones agrees, noting that spermatogenesis is also a great system to manipulate experimentally. "Spermatogenesis is le...

Diabetes linked to male infertility; excess sugars in the body have direct effect on sperm quality

...or cell growth that help stabilise the structure of DNA. We also found that spermatogenesis 20, a factor unique to the testis and whose function remains unknown, was g...s, possibly through the use of dietary supplements. "Finally, there is spermatogenesis 20. What does it do, how does it do it, under what circumstances and why? W...

X-effect: female chromosome confirmed a prime driver of speciation

...e says. When I look at this, I think the X is not behaving normally during spermatogenesis (sperm creation), says Presgraves. I think it may be that in the production... when it should. If the process that controls normal X inactivation during spermatogenesis is particularly susceptible to evolutionary change, says Presgraves, then i...

Chromosomal abnormalities in sperm higher after vasectomy reversal

...loidy and diploidy, we would know that obstruction by vasectomy must affect spermatogenesis in the longer term." The scientists found a significant correlation ...y raises a lot of questions", said Professor Sukcharoen. "Is the abnormal spermatogenesis reversible, and if so, how long will it take before things get back to norm...

Hormonal male contraception reversible after few months for all men

...er age, Asian origin, shorter treatment duration, and higher sperm concentrations at baseline. Although these factors modulated the speed of recovery, spermatogenesis recovered to levels compatible with fertility in all men. Dr Liu and colleagues comment: "Our data provide strong assurance that the previously des...

Olfactory system detects pheromones that control reproduction

... the onset of puberty. In females it also stimulates ovulation and controls the estrus cycle. In males, the hormone controls gonad function, including spermatogenesis and testosterone production. "One of the classical dogmas is that LHRH neurons receive inputs from the vomeronasal system. For example, textbooks o...
Spermatogenesis in Biological Definition

Spermatogenesis

Spermatogenesis refers to the creation, or genesis, of sperm cells, which occurs in the male gonads or testes . Sperm cells develop initially from germ stem cells known as spermatogonia . As these differentiate they become spermatocytes , spermatids (after meiosis ) and then finally ...

Gene

...ode proteins that figure in the same cellular process or in completely unrelated processes. As an example of the former, many of the genes involved in spermatogenesis reside together on the Y chromosome . Many species carry more than one copy of their genome within each of their somatic cells . These organisms ...

Semen

...e of increased sperm fragility. Zinc deficiency can also adversely affect spermatogenesis . The simple sugar fructose is the main energy source of sperm cells,...ed to the skin, mainly for cosmetic purposes. See also sperm spermatogenesis capacitation sexual slang for a list of various commonly used te...

Sperm

... rotating like a rutter not side to side like a whip. The cell is characterized by a minimum of cytoplasm. Sperm production Main article: spermatogenesis Sperm are produced in the seminiferous tubules of the testes in a process called spermatogenesis. Round cells called spermatogonia divide and d...
Spermatogenesis in Biological Dictionary

Spermatogenesis

Spermatogenesis is the process by all males spermatogonia develop into mature spermatozoa. Spermatozoa are the mature male gametes in many sexually reproducing organisms. Thus, spermatogenesis is the male version of... spermatogenesis n. Formation and development of spermatozoa by mei...

Spermiogenesis

... Spermiogenesis is the final stage of spermatogenesis which sees the maturation of spermatids into ma...develops an acrosome, and tail, ... regulation of spermatogenesis and spermiogenesis . J Steroid Biochem Mol Biol. ... spermatogenesis and spermiogenesis . Fertilization and early embr...

Spermatid

...les and research from Academic Journals, Newspapers, and magazines at HighBeam.com. Free Trial, Credit Card Required. ... to acommander vertebrate spermatogenesis spermatid by altotor on 2009 ... Identification and expression profiling of 10 novel spermatid expressed CYPT genes. ... Spermatid informa...

Oogenesis

...s development of ova ... How are oogenesis and spermatogenesis different? Read answer... What is the similarities of spermatogenesis and oogenesis ? ... Developmental Biology pro...nd sexual maturation in Meretrix ... In both spermatogenesis and oogenesis , a haploid nucleus is formed ...

Germ line

....com. Germline Stem Cells Books|Non-Fiction|English |Hardcover|Science|Humana Pr Inc|Methods in Molecular Biology... 5 Germ-line development. 6 spermatogenesis and spermiogenesis. 7 References. Figures ... GermFIG 3A-D - Germ-line cell. nuclei morphologies in meiotic. prophase 1 ... Find the lowest pri...

Gametogenesis

...evelopment and production of the male and ... Gametogenesis describes and includes all the processes involved in the ... Gametogenesis include spermatogenesis (production of spermatozoa) and oogenesis ... From the On-Line Biology Book. ... Gametogenesis is the process of forming gametes (by definit...
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