HOME >> BIOLOGY >> NEWS
The First Rejection: Eggs Sequester Bits Of Sperm For Later Elimination

Portions of the tail of gigantic fruit fly sperm, which enters the egg entirely during fertilization, persist in the developing midgut of the embryo and are excreted soon after the larva hatches, reports Tim Karr, a developmental biologist at the University of Chicago, and Scott Pitnick, an evolutionary biologist at the University of Syracuse in the May 7 issue of Proceedings of the Royal Society London B.

Karr and Pitnick, who have been studying the often bizarre sperm-egg interactions of Drosophila for several years, previously noticed that the long tails of fruit fly sperm entered the egg during fertilization, undermining the idea that the only role of the sperm tail is to propel its genetic cargo to the egg.

"It was remarkable that the egg accepted so much spermic material, especially since the tails of some sperm are over twenty times the length of the egg!" says Karr. "It became clear that the tail might be involved in the embryo's early development."

Now, using fluorescence staining, Karr and Pitnick have tracked the fate of the giant sperm tails of two species of fruit fly, D. melanogaster and D. pachea, throughout embryogenesis. They noticed that after the sperm entered the egg, its tail was partially degraded by the egg's enzymes, but otherwise remained intact and was sequestered in the developing embryo's midgut. One section of the tail was observed to remain untouched by the egg's enzymes. This particular segment could be seen in the guts of recently hatched larvae, where it appeared as a tight coil in photographs where the sperm had been stained with a fluorescent dye.

But when Karr and Pitnick looked for these pieces after the larvae were allowed to feed for a few hours, they were no longer detectable. Apparently, the larvae excrete the piece with their waste, says Karr, "We were pretty surprised that this
'"/>

Contact: Sharon Parmet
sparmet@mcis.bsd.uchicago.edu
773-702-6241
University of Chicago Medical Center
4-May-1998


Page: 1 2 3

Related biology news :

1. First glimpse of DNA binding to viral enzyme
2. First clinical study of new pediatric croup vaccine shows safety, tolerability in adults
3. 2nd media alert First Scientific Conference on Childhood Leukaemia
4. First International Scientific Conference on Childhood Leukaemia
5. First ever standards linking climate change, biodiversity and poverty seek global peer review
6. First genetic comparison of purebred domestic dogs produces surprises
7. First time in the U.S.: Saint Louis University tests third-generation vaccine against smallpox
8. First target for childhood malaria vaccine
9. First study of resveratrol dietary supplement finds effect on breast and prostate cancers unlikely
10. First flavors form a lasting impression
11. STN International launches Derwent World Patents Index First View

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/29/2017)... , March 29, 2017  higi, the health ... in North America , today announced ... and the acquisition of EveryMove. The new investment and ... set of tools to transform population health activities through ... lifestyle data. higi collects and secures data ...
(Date:3/27/2017)... CENTRE, N.Y. , March 27, 2017 /PRNewswire-USNewswire/ ... Healthcare Information and Management Systems Society (HIMSS) Analytics ... Outpatient EMR Adoption Model sm . In addition, ... 12% of U.S. hospitals using an electronic medical ... CHS for its high level of EMR usage ...
(Date:3/24/2017)... Mar 24, 2017 Research and Markets has ... Market Analysis & Trends - Industry Forecast to 2025" report ... ... at a CAGR of around 15.1% over the next decade to ... report analyzes the market estimates and forecasts for all the given ...
Breaking Biology News(10 mins):
(Date:10/9/2017)... ... ... The award-winning American Farmer television series will feature 3 Bar Biologics in ... 8:30aET on RFD-TV. , With global population estimates nearing ten billion people by ... feed a growing nation. At the same time, many of our valuable resources are ...
(Date:10/9/2017)... (PRWEB) , ... October 09, 2017 , ... ... a four-tiered line of medical marijuana products targeting the needs of consumers who ... packaging of Kindred takes place in Phoenix, Arizona. , As operators of two ...
(Date:10/7/2017)... (PRWEB) , ... October 06, ... ... years’ experience providing advanced instruments and applications consulting for microscopy and surface ... expertise in application consulting, Nanoscience Analytical offers a broad range of contract ...
(Date:10/7/2017)... Mass. , Oct. 6, 2017  The ... work of three scientists, Jacques Dubochet, Joachim ... breakthrough developments in cryo-electron microscopy (cryo-EM) ... technology within the structural biology community. The winners ... Scientists can now routinely produce highly resolved, three-dimensional ...
Breaking Biology Technology:
Cached News: