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Latest Sperm Stories

First Genetic Sequence Of Individual Human Sperm
2012-07-20 07:58:23

Connie K. Ho for redOrbit.com — Your Universe Online Sperm cells can look the same with a similar tadpole appearance. However, the cells showcase differences among the genes. Recently, researchers were able to capture an image of the varieties among genes which they say is particularly helpful in understanding the genome and male fertility. The research is featured in the July 20 edition of Cell, a Cell Press journal. The scientists believe that the methods used could help...

2012-05-25 05:33:08

(Ivanhoe Newswire) - A new type of male contraceptive could be created thanks to the discovery of a key gene essential for sperm development. This could lead to alternatives to the conventional male contraceptives which rely on the production of hormones, such as testerone. Research led by the University of Edinburgh, shows how the gene Katnal1 is critical to enable sperm maturity in the testes. If scientists can regulate Katnal1 in the testes, they could prevent sperm completely maturing,...

How Flowers Pollinate With Precision
2012-05-17 11:25:35

Next Mother's Day, say it with an evolved model of logistical efficiency – a flower. A new discovery about how nature's icons of romance manage the distribution of sperm among female gametes with industrial precision helps explain why the delicate beauties have reproduced prolifically enough to dominate the earth. In pollination, hundreds of sperm-carrying pollen grains stick to the stigma suspended in the middle of a flower and quickly grow a tube down a long shaft called a style...

Sperm Crawl And Collide On Way To Egg
2012-05-07 14:12:38

Scientists at the Universities of Birmingham and Warwick have shed new light on how sperm navigate the female reproductive tract, 'crawling' along the channel walls and swimming around corners; with frequent collisions. Research results published today (Tuesday May 8, 2012) in the Proceedings of the National Academy of Sciences of the United States (PNAS) provide fresh insight into how sperm might find their way to the egg that will help to inform future innovation in the struggle to treat...

2012-05-01 09:44:46

Experts from Durham University have identified a new gene that could help the development of fertility treatments in humans in the future. Scientists from Durham University, UK, and Osaka University, Japan, looking at fertility in mice, have discovered for the first time that the gene, which makes a protein called PDILT, enables sperm to bind to an egg, a process essential to fertilization. The team found that when the gene was 'switched off' in male mice, less than three per cent of...

2012-04-03 10:02:30

A study in The Journal of Cell Biology describes how a secreted enzyme helps egg cells avoid being fertilized by more than one sperm. Because polyspermy disrupts embryonic development, oocytes take several steps to ensure they only fuse with a single sperm. One key step is to prevent additional sperm from binding to the surface of an already-fertilized egg, a blockade that involves the release of secretory granules and cleavage of a protein called ZP2, a component of the zona pellucida...

2012-03-08 00:54:06

The speed at which the calcium concentration in the cell changes controls the swimming behavior of sperm. They can calculate the calcium dynamics and react accordingly. Sperm have only one aim: to find the egg. The egg supports sperm in their quest by emitting attractants that induce changes in the calcium level inside sperm. Calcium ions determine the beating pattern of the sperm tail which enables sperm to steer. Together with colleagues from the Max Planck Institute for the Physics of...

2012-02-29 14:09:28

It had long been assumed that the human sperm cell´s mission in life ended once it had transferred its freight of parental DNA to the egg. More recently however, other components of sperm have been implicated in fertilization, and perhaps even in subsequent embryonic development. In a new study appearing in the Proceedings of the Royal Society, Timothy Karr, a researcher at Arizona State University´s Biodesign Institute, along with colleagues from the Universities of Cambridge...

2012-02-29 00:30:32

Sperm cannot detect smells. According to a 2003 study by German and American scientists, a component of the Lily of the Valley scent known as Bourgeonal alters the calcium balance of human sperm and attracts the sperm. The “Lily of the Valley phenomenon” — also the title of a book about smelling — was born as a result of this discovery that sperm act as swimming olfactory cells which follow a “scent trail” laid by the egg. However, a detailed explanation...

2012-02-16 15:05:52

Yale researchers have discovered how the "guardian of the genome'' oversees quality control in the production of sperm – and perhaps in many other cells as well. The research published online Feb. 16 in the journal Current Biology opens up the potential of developing new forms of birth control and fertility treatment – and even new ways to combat many forms of cancer. Sperm and other cells go through a sort of inspection process triggered by a key regulatory gene, p53, which...