HOME >> BIOLOGY >> NEWS
Ancient defense mechanism may still be protecting us

to the next until a "safe to use" set of genes remain to be given to the cell's offspring.

Nearly all cells house their DNA inside a nucleus, but Tetrahymena houses different versions of its DNA in each of its two nuclei. The smaller nucleus (called the micronucleus) does nothing more than keep the cell's full genome safe, acting as a sort of "lock box." The larger nucleus (called the macronucleus), on the other hand, uses the DNA to regulate the cell's life functions. This macronucleus houses about 15 percent fewer DNA sequences than the smaller one, and when the cell mates to create a new generation of cells, this large macronucleus withers and dies. Before it completely expires, however, the small nucleus steps in and produces a new large and small nucleus set. To make sure no new viral sequences have sneaked into the lock box, the cell checks the DNA of the small, lock box nucleus against the DNA of the old large nucleus and eliminates any foreign material before allowing the new large nucleus to develop.

Gorovsky's team believes that in evolutionarily ancient times, cells had to fight against a variety of assaults just as they must today: viruses attacked cells, injecting their DNA, disrupting normal cell functions; and transposons, bits of nomadic genetic material, would fit themselves in several places in the cell's genome, copying themselves prodigiously and wreaking havoc. To survive, cells evolved a correction system that recognized the invading DNA and either eliminated or silenced it. Gorovsky and Mochizuki propose that the small nucleus "transcribes" into RNA part or all of its DNA, essentially making RNA photocopies of certain DNA sections. These transcriptions include the sections that may have been corrupted by some genetic marauder like a virus or transposon. The transcribed RNAs then migrate out of the small nucleus, through the cell to the large nucleus where they mingle with the macronucleus' DNA. If an RNA comes across a section
'"/>

Contact: Jonathan Sherwood
Jonathan.Sherwood@rochester.edu
585-273-4726
University of Rochester
17-Oct-2002


Page: 1 2 3

Related biology news :

1. Ancient life form may help create newest technologies
2. Ancient brewery discovered on mountaintop in Peru
3. Ancient Greeks help scientists build environmentally friendly nano devices
4. Ancient DNA mutations permitted humans to adapt to colder climates, UCI researchers find
5. Ancient Inca road in desperate need of protection
6. Ancient DNA analysis unveils mystery of historys most horribly deformed man -- The Elephant Man
7. Ancient pollen yields insight into forest biodiversity
8. Ancient flower fossil points to underwater origins
9. Ancient supernova may have triggered eco-catastrophe
10. Ancient Chinese folk remedy may hold key to non-toxic cancer treatment
11. Ancient reptile is efficient chewer

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Ancient defense mechanism may still protecting

(Date:11/7/2014)... , November 6, 2014 Leading ... for better mobile security revolutionizing online transactions.  Companies in focus ... Holdings Ltd. (NYSE: BABA ), Google Inc. (NASDAQ: ... ), eBay Inc. (NASDAQ: EBAY ) and MasterCard ... NXTD and NXTDW), a biometric authentication company focused on ...
(Date:11/6/2014)... Medicine, Inc, a Baltimore-based bioinformatics company focused on ... a research collaboration with the international leader in ... CSBR). , "There are many companies utilizing advances ... TumorGraft technology is unique in a way that ... vast amounts of valuable data. Our bioinformatic analysis ...
(Date:11/4/2014)... SALT LAKE CITY, Nov. 5, 2014 – University of ... uses enzymes to help jet fuel produce electricity without ... can be used to power portable electronics, off-grid power ... appears online today in the American Chemical Society journal ... into electricity through a chemical reaction between a fuel ...
Breaking Biology News(10 mins):Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 2Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 3Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 4Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 5Universal Authentication Methods Provide More Secure Operations for Biometrics Devices - Company Joins FIDO Alliance for Consumer Protection 6Insilico Medicine, Inc announces research collaboration with Champions Oncology, Inc 2Jet-fueled electricity at room temperature 2
(Date:11/27/2014)... -- First articles published now available ... Elsevier , a world-leading provider of scientific, technical and ... the launch of a new journal: Extreme ... launch of Extreme Mechanics Letters is driven ... applied sciences such as micro and nanotechnologies, biotechnologies, soft ...
(Date:11/26/2014)... 21, 2014 (PRWEB) November 26, 2014 ... communications network, today announced the organization has won a ... Club Awards. Digitas Health LifeBrands was honored with a ... other PHCG agencies received eight Awards of Excellence. ... aspects of pharmaceutical advertising and promotion. The Awards provide ...
(Date:11/26/2014)... The North America Thermal Protective ... for detailed analysis of the growth trends and ... $616.3 million by 2018, growing at a CAGR ... through the TOC of the North America Thermal ... of the in-depth analysis and industry segmentation supported ...
(Date:11/26/2014)... and PHILADELPHIA , Nov. ... most demanding and unforgiving environments. Human exploration of space ... performance to ensure mission safety and success, and prevent ... performance for mission success, little is known about how ... of cognition are primarily affected. Now, Penn ...
Breaking Biology Technology:Elsevier Announces the Launch of a New Journal: Extreme Mechanics Letters 2Elsevier Announces the Launch of a New Journal: Extreme Mechanics Letters 3Publicis Healthcare Wins 20 Rx Club Awards 2Publicis Healthcare Wins 20 Rx Club Awards 3The North America Thermal Protective Clothing Market is estimated to grow up to $616.3 million by 2018 - Report by MicroMarket Monitor 2The North America Thermal Protective Clothing Market is estimated to grow up to $616.3 million by 2018 - Report by MicroMarket Monitor 3Penn Medicine Team Develops Cognitive Test Battery to Assess the Impact of Long Duration Spaceflights on Astronauts' Brain Function 2Penn Medicine Team Develops Cognitive Test Battery to Assess the Impact of Long Duration Spaceflights on Astronauts' Brain Function 3Penn Medicine Team Develops Cognitive Test Battery to Assess the Impact of Long Duration Spaceflights on Astronauts' Brain Function 4
Cached News: