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Tag: "testis" at biology news

Environmental chemical cocktail may sabotage sperm

... the negative impact of environmental chemicals on testis function, resulting in reduced numbers of sperm being produced, but these effects require much larger doses than we have used. As far as I am aware, we are the only group looking at subtle effects that could have a serious impact on fertility without...

Human embryonic stem cells have the potential to develop into eggs and sperm in the laboratory

... follicle for egg development or the tissue of the testis for sperm. We want to test whether HESCs can differentiate to cells that produce the hormones for sperm and egg development and isolate these as well. What is extraordinary is that the embryoid bodies seem to produce spontaneously the tissue and envi...

'Jumping genes' contribute to the uniqueness of individual brains

...own for a long time that L1 elements are active in testis and ovaries, which explains how they potentially p...e cells," says Gage. Apart from their activity in testis and ovaries, jumping L1 elements are not only unique to the adult brain but appear to happen also du...

Studies on human genome variation provide insight into disease

...ANX genes that are predominantly expressed in the testis and in certain tumors. In this month's issue of Genome Research , Dr. Vladimir Larionov and his colleagues examined the genetic architecture of the SPANX cluster and showed how the region exhibited dynamic deletions, duplications, and gene conver...

Housecat-sized Siberian tiger cubs get collared

...ANX genes that are predominantly expressed in the testis and in certain tumors. In this month's issue of Genome Research , Dr. Vladimir Larionov and his colleagues examined the genetic architecture of the SPANX cluster and showed how the region exhibited dynamic deletions, duplications, and gene conver...

Study hints at role of stem cell genes in testicular, breast cancers

...erm-producing germ cells, which are located in the testis and produce sperm in boys following puberty. Germ ...minoma samples examined, when compared with normal testis tissue. GDF3 was elevated in 90 percent of cases, OCT4 was elevated in 56 percent of cases and NANOG...

Genetic tug of war determines sexual differentiation

...mammalian gonad before it commits to either a male testis or a female ovary. If this equilibrium is tipped i...e gonad has the ability to transform either into a testis or an ovary. During the earliest stages of development, both XX and XY gonads are characterized by s...

Injection may prevent infertility in men receiving cancer chemotherapy

... that enhances the immune system could protect the testis from the effects of paclitaxel (Taxol), a widely used chemotherapy drug. "The effects of chemotherapy treatment on fertility are an important issue for long-term survivors of cancer who may not have started or completed a family at the time of diagn...

Human testis harbors HIV-1 in resident immune cells

... report by Roulet et al., “Susceptibility of human testis to human immunodeficiency virus-1 infection in sit...hers led by Dr. Nathalie Dejucq-Rainsford examined testis tissue for the presence of HIV receptors. They found that all of the necessary cellular receptors (C...

Researchers discover that sheep need retroviruses for reproduction

...uses infected the germline (cells of the ovary and testis that have genetic material that are passed to their offspring) of the host, which is then inherited by their children. These retroviruses, known as endogenous retroviruses, are present in the genome of all mammals, including humans. Consequently, e...

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