Sperm gene sparks fertility hope
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Scientists believe they have discovered a gene which plays a critical role in the development of sperm.
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WASHINGTON -- A procedure that encourages an egg to begin embryo development without being fertilized could suggest a new way to produce stem cells, at least for certain patients.
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Nov. 4, 2004 -- Scientists from the University of Pennsylvania have successfully grown stem cells that make sperm, which could eventually lead to new treatments for male infertility.
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Researchers at the University of Pennsylvania School of Veterinary Medicine have identified the growth factors essential to allow spermatogonial stem cells -- the continually self-renewing cells that produce sperm -- to exist in culture indefinitely.
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A procedure that encourages an egg to begin embryo development without being fertilized could suggest a new way to produce stem cells, at least for certain patients.
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NEW YORK  - A new study provides "reassuring" evidence that babies born from in vitro fertilization with preimplantation genetic diagnosis (PGD) -- in which a cell or two are removed from the developing embryo to screen for genetic problems -- are not at increased risk of birth defects.
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Biologists have uncovered a gene that switches off stem cells as a person ages.
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The options for male contraception have been limited to condoms and vasectomies. But researchers now point to a new method that shows promise, a shot that prompts an immune reaction to a protein produced in the male reproductive system.
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A simple surgical procedure can treat what some regard as a leading cause of male infertility, scientists report.
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San Diego scientists have identified a protein in embryonic stem cells that helps weed out mutations as the cells proliferate. Its action may protect a developing embryo from DNA damage that could lead to cancer later in life.
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More and more couples are turning to an embryo-screening technique that allows them to choose the genetic makeup of their children, according to a survey released yesterday in the online edition of the journal Fertility and Sterility.
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By Michael Stroh, The Baltimore Sun  Sep. 10--A flurry of new genetic and epidemiological studies is chipping away at a prized male myth: Sperm, it turns out, don't age as well as some men imagine.
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Scientists identify a protein that helps detect DNA damage in developing eggs.
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Cloning sperm could enable men with very low sperm counts to become fathers, say US scientists.
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NEW YORK  - Parents who conceive using  donated sperm often opt not to tell the child. But a small  study suggests that choosing to be open about it may be good  for the parent-child relationship.
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Gene therapy using &quot;naked DNA&quot; might one day help prevent impotence, scientists now report.
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A gene that helps to stave off the effects of multiple sclerosis has been discovered by scientists.