HOME >> BIOLOGY >> NEWS
Eggs Fertilised By More Than One Sperm Can Survive

EGGS fertilised by more than one sperm are supposed to be doomed. But biologists have now found that pig eggs can engage in a ménage á trois with two sperm and still produce a perfectly healthy embryo.

Polyspermy, as the fusion of an egg with more than one sperm is known, should create chaos by introducing an extra set of chromosomes. "Many people thought polyspermy must be a dead end," says Yong-Mahn Han of the Korea Research Institute of Bioscience and Biotechnology in Taejon. "But that isn't what we found."

Working with Randall Prather and colleagues at the University of Missouri in Columbia, Han conducted IVF on pig eggs and implanted those containing multiple sperm. About a twelfth of these embryos grew into healthy pigs with a normal complement of chromosomes.

To understand how this was possible, the researchers took a closer look at what happens to fertilised eggs after they fuse with two sperm. They discovered that the three pronuclei-the nuclei from egg and sperm that normally unite before the egg divides-could assume two different groupings. In one, the pronuclei form a threesome at the centre of the embryo. These are presumably almost certain to die while attempting development with an extra set of chromosomes.

But in more than half of eggs fertilised by two sperm, two pronuclei pair up, while the other is left to one side. The researchers believe this allows the extra set of chromosomes to be segregated into a cell of its own. Han suspects that this cell shrivels and dies, leaving the rest of the embryo with a normal number of chromosomes.

Author: Philip Cohen
New Scientist magazine, issue 23rd Jan 99


'"/>

Contact: Claire Bowles
claire.bowles@rbi.co.uk
44-171-331-2751
New Scientist
20-Jan-1999


Page: 1

Related biology news :

1. Fool An Egg Into Thinking Its Fertilised, And It Will Repel All Comers
2. Sperm use heat sensors to find the egg
3. Sperm and germ-fighting contraceptive enters trials
4. Sperm counts unchanged over 50 years
5. Male Moths Sperm Protects Females
6. Gene Once Thought To Program Ovarian Development Instead Found To Be Critical For Production Of Sperm
7. Bacteria That Disable Sperm
8. Sperm Protein May Hold Clues For Fertility And Contraceptives
9. UB Fertility Researchers Find They Can Predict Pregnancy By Assessing Two Sperm Abnormalities
10. The First Rejection: Eggs Sequester Bits Of Sperm For Later Elimination
11. Reanalysis Of International Data Finds Sharp Decline In Sperm Density

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


(Date:3/30/2017)... 2017  On April 6-7, 2017, Sequencing.com will host ... hackathon at Microsoft,s headquarters in Redmond, ... on developing health and wellness apps that provide a ... Genome is the first hackathon for personal genomics ... companies in the genomics, tech and health industries are ...
(Date:3/29/2017)...  higi, the health IT company that operates the ... , today announced a Series B investment from ... The new investment and acquisition accelerates higi,s strategy to ... population health activities through the collection and workflow integration ... collects and secures data today on behalf of over ...
(Date:3/24/2017)... 2017 The Controller General of Immigration from Maldives ... Algeen have received the prestigious international IAIR Award for the most ... Reading ... Maldives ... Abdulla Algeen (small picture on the right) have received the IAIR award ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... ... it will be hosting a Webinar titled, “Pathology is going digital. Is your ... on digital pathology adoption best practices and how Proscia improves lab economics and ...
(Date:10/11/2017)... ... October 11, 2017 , ... Singh Biotechnology today ... designation to SBT-100, its novel anti-STAT3 (Signal Transducer and Activator of Transcription 3) ... able to cross the cell membrane and bind intracellular STAT3 and inhibit its ...
(Date:10/10/2017)... 2017 International research firm Parks Associates announced today ... the TMA 2017 Annual Meeting , October 11 in ... home security market and how smart safety and security products impact the ... Parks Associates: Smart Home Devices: ... "The residential security market has experienced ...
(Date:10/9/2017)... ... 2017 , ... The award-winning American Farmer television series will feature 3 Bar ... Tuesdays at 8:30aET on RFD-TV. , With global population estimates nearing ten billion ... continue to feed a growing nation. At the same time, many of our valuable ...
Breaking Biology Technology:
Cached News: