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Latest Germ cells Stories

2012-01-30 09:15:58

A new study shows the production of sperm is more biologically taxing than previously thought, and expending energy on it has significant health implications. In research published in PLoS ONE, Dr Damian Dowling of Monash University's School of Biological Sciences and Professor Leigh Simmons of the University of Western Australia have investigated the trade-off between sperm quality and immunity. The researchers used the Australian cricket, Teleogryllus oceanicus to prove that the...

2012-01-10 11:17:06

Who knew that male fertility depends on sperm-cell architecture? A University of Illinois study reports that a certain omega-3 fatty acid is necessary to construct the arch that turns around, immature sperm cell into a pointy-headed super swimmer with an extra long tail. "Normal sperm cells contain an arc-like structure called the acrosome that is critical in fertilization because it houses, organizes, and concentrates a variety of enzymes that sperm use to penetrate an egg," said Manabu...

Listen Up Men! Your Laptop’s Wi-Fi Could Be Killing Your Sperm
2011-11-29 08:24:18

Wi-Fi technology could be dangerous to a man´s sperm quality, suggests a new study published in the journal Fertility and Sterility. Argentinean scientists, led by Conrado Avendano of the Nascentis Center for Reproductive Medicine in Cordoba, describe in their report how they got semen samples from 29 healthy men, placed a few drops from those samples under a laptop with a Wi-Fi connection, and then used the laptop to do various everyday tasks. Within four hours of use, 25 percent...

2011-11-15 20:27:40

A Ben-Gurion University of the Negev researcher has achieved a significant breakthrough in male fertility, producing normal sperm from mouse cells. "This study may open new therapeutic strategies for infertile men who cannot generate sperm and/or pre-pubertal cancer patients at risk of infertility due to aggressive chemo- or radiotherapy and cannot cryopreserve sperm as in adult patients," explains Prof. Mahmoud Huleihel, of BGU's Shraga Segal Department of Microbiology and Immunology in...

2011-11-01 15:19:14

San Francisco State University study published by the journal Genetics Compared to most other cells in an organism, sperm undergo a radical transformation to become compact and mobile delivery systems for paternal DNA. Even though sperm looks and moves quite differently across species, SF State researcher Diana Chu and colleagues now say that there are at least a few key enzymes that are critical for sperm development and mobility in species as different as mice and nematode worms. The...

2011-10-28 06:44:49

By Alicia Rose DelGallo, Ivanhoe Health Correspondent (Ivanhoe Newswire) — The accepted view of female reproduction includes a pre-determined amount of eggs in the ovaries. This population of eggs becomes depleted over time, resulting in infertility among older women. Jonathon L. Tilly, PhD, Director of the Vincent Center for Reproductive Biology at MassGeneral Hospital and professor at Harvard Medical School, presented new ideas about ovarian cells at the 67th annual meeting of the...

Cells Are Crawling All Over Our Bodies
2011-10-19 03:28:51

Biologists at Florida State devise new way to watch how cells move For better and for worse, human health depends on a cell's motility —— the ability to crawl from place to place. In every human body, millions of cells —are crawling around doing mostly good deeds ——— though if any of those crawlers are cancerous, watch out. "This is not some horrible sci-fi movie come true but, instead, normal cells carrying out their daily duties," said Florida State...

2011-10-06 11:26:25

Researchers at Brown University and Women & Infants Hospital of Rhode Island have developed a way to extract information about gene expression from fertile human egg cells without hurting them. Expendable ℠polar bodies´ in the cells reflect much the same information as the eggs themselves, researchers have determined. Given the stakes of in vitro fertilization, prospective parents and their doctors need the best information they can get about the eggs they will extract,...

Important Step Identified In Sperm Reprogramming
2011-09-23 03:39:10

   When sperm meets egg, the chemical instructions that tag sperm cells must be erased so that human life can start anew. One way these instructions are erased is through demethylation, the removal of specific chemical tags or methyl groups that dot the underlying DNA of cells. Though scientists have known about this phenomenon for a decade, exactly how such "reprogramming" occurs has proved elusive. Now, a study from the University of North Carolina at Chapel Hill School of...

2011-08-29 12:07:09

Most cells rely on structural tethers to position chromosomes in preparation for cell division. Not so oocytes. Instead, a powerful intracellular stream pushes chromosomes far-off the center in preparation for the highly asymmetric cell division that completes oocyte maturation upon fertilization of the egg, report researchers at the Stowers Institute for Medical Research. Their findings illustrate how oocytes repurposed a dynamic cellular mechanism capable of generating considerable...