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:


(Date:4/11/2017)... , April 11, 2017 No two ... researchers at the New York University Tandon School ... Engineering have found that partial similarities between prints ... used in mobile phones and other electronic devices ... The vulnerability lies in the fact that ...
(Date:4/5/2017)... Allen Institute for Cell Science today announces the launch ... dynamic digital window into the human cell. The website ... deep learning to create predictive models of cell organization, ... suite of powerful tools. The Allen Cell Explorer will ... resources created and shared by the Allen Institute for ...
(Date:4/4/2017)... NEW YORK , April 4, 2017   ... solutions, today announced that the United States Patent and ... The patent broadly covers the linking of an iris ... the same transaction) and represents the company,s 45 th ... our latest patent is very timely given the multi-modal ...
Breaking Biology News(10 mins):
(Date:9/21/2017)... Paramus, New Jersey (PRWEB) , ... September 21, ... ... for highly-regulated pharmaceutical and clinical research sector professionals, has announced the addition of ... CFR Part 11 training - Compliance with Regulation 21 CFR Part 11 ...
(Date:9/20/2017)... ... September 20, 2017 , ... ... has appointed Vishwas Paralkar to the role of chief scientific officer. In this ... will report to Cybrexa’s president and CEO, Per Hellsund. , “I was impressed ...
(Date:9/20/2017)... Dallas-Fort Worth, Texas (PRWEB) , ... September 20, 2017 , ... ... people, stem cell therapy succeeded after standard medicine failed. Many of these people had ... - Progress, Not Regression Free Download (pdf) , “Neil ...
(Date:9/19/2017)... ... September 19, 2017 , ... A ... funded early-stage tech companies. “Grit” author Angela Duckworth and her team at Character ... community is Cooley, an international law firm with decades of experience supporting high-growth ...
Breaking Biology Technology:
Cached News: