Navigation Links
Dark matter made visible before the final cut
Date:1/7/2013

CHAPEL HILL, N.C. Research findings from the University of North Carolina School of Medicine are shining a light on an important regulatory role performed by the so-called dark matter, or "junk DNA," within each of our genes.

The new study reveals snippets of information contained in dark matter that can alter the way a gene is assembled.

"These small sequences of genetic information tell the gene how to splice, either by enhancing the splicing process or inhibiting it. The research opens the door for studying the dark matter of genes. And it helps us further understand how mutations or polymorphisms affect the functions of any gene," said study senior author, Zefeng Wang, PhD, assistant professor of pharmacology in the UNC School of Medicine and a member of UNC Lineberger Comprehensive Cancer Center.

The study is described in a report published in the January 2013 issue of the journal Nature Structural & Molecular Biology.

The findings may be viewed in terms of the film industry's editorial process where snippets of celluloid are spliced, while others end up unused on the proverbial cutting room floor.

Taken from a DNA point of view, not every piece of it in each human gene encodes for a functional protein; only about 10 percent does, in coding regions called "exons." The other 90 percent of the stuff that fills the intervening regions are longer stretches of dark matter known as "introns."

But something mysterious happens to introns during the final processing of messenger RNA (mRNA), the genetic blueprint that's sent from the cell's nucleus to its protein factory. Only particular exons may be included within the final mRNA produced from that gene, whereas the introns are cut out and destroyed.

It's therefore easier to understand why more scientific attention has been given to exons. "When people are looking at the genetics of a disease, most of the time they're looking for the change in the coding sequence," Wang said. "But 90 percent of the sequence is hidden in the gene's introns. So when you study gene variants or polymorphisms that cause human disease, you can only explain the part that's in the exon. Yet the majority remains unexplainable because they're in the introns."

Following completion of the genome sequencing projects, subsequent DNA and RNA sequencing revealed the existence of more than one splice variant, or isoform, for 90 percent of human genes. During messenger RNA processing, most human genes are directed to be cut and pasted into different functional isoforms.

In a process called alternative splicing, a single gene could code for multiple proteins with different biological functions. In this way, alternative splicing allows the human genome to direct the synthesis of many more proteins than would be expected from its 20,000 protein-coding genes.

"And those different versions sometimes function differently or in opposite ways," Wang said. "This is a tightly regulated process, and a great number of human diseases are caused by the 'misregulation' of splicing in which the gene was not cut and pasted correctly."

Wang's research colleagues identified "intronic splicing regulatory elements." These essentially recruit protein factors that can either enhance or inhibit the splicing process.

Their discovery was accomplished by inserting an intron into a green fluorescent protein (GFP) "reporter" gene. These introns of the reporter gene carried random DNA sequences. When the reporter is screened and shows green it means that portion of the intron is spliced.

"The default is dark," so any splicing enhancer or silencer can turn it green," Wang explains. "In this unbiased way we can recover hundreds of sequences of inhibited or enhanced splicing."

The study collaborators put together a library of cells that contain the GFP reporter with the random sequence inserted. Thus, when researchers looking at the intron try to determine what a particular snippet of genetic information does and its effect on gene function, they can refer to the splicing regulatory library of enhancers or silencers.

"So it turns out that the sequencing element in both exons and introns can regulate the splicing process, Wang says. "We call it the splicing code, which is the information that tells the cell to splice one way or the other. And now we can look at these variant DNA sequences in the intron to see if they really affect splicing, or change the coding pattern of the exon and, as a result, protein function."


'/>"/>

Contact: Les Lang
llang@med.unc.edu
919-966-9366
University of North Carolina Health Care
Source:Eurekalert  

Related biology news :

1. Size does matter in sexual selection, at least among beetles
2. Probing matters of the heart
3. For the rooster, size matters
4. Black belts white matter shows how a powerful punch comes from the brain
5. US-Russian collaboration develops new method for sequencing dark matter of life from a single cell
6. No matter the drilling method, natural gas is a much-needed tool to battle global warming
7. Want bigger plants? Get to the root of the matter
8. Theres more star-stuff out there but its not dark matter
9. A matter of priorities
10. Size matters: Large Marine Protected Areas work for dolphins
11. Ultracold matter technology from CU and SRI International licensed to Boulders ColdQuanta
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Dark matter made visible before the final cut
(Date:6/9/2016)... , June 9, 2016  Perkotek an innovation leader in attendance control systems ... seamlessly log work hours, for employers to make sure the right employees are actually ... http://photos.prnewswire.com/prnh/20160609/377486LOGO ... ... ...
(Date:6/3/2016)... LONDON , June 3, 2016 /PRNewswire/ ... Transport Management) von Nepal ... ,Angebot und Lieferung hochsicherer geprägter Kennzeichen, einschließlich ... weltweit führend in der Produktion und Implementierung ... an der Ausschreibung im Januar teilgenommen, aber ...
(Date:6/2/2016)... 2016 Perimeter Surveillance & Detection ... Physical Infrastructure, Support & Other Service  The ... offers comprehensive analysis of the global Border Security ... revenues of $17.98 billion in 2016. Now: ... leader in software and hardware technologies for advanced video ...
Breaking Biology News(10 mins):
(Date:6/24/2016)... DIEGO , June 24, 2016 ... more sensitively detects cancers susceptible to PARP inhibitors ... circulating tumor cells (CTCs). The new test has ... HRD-targeted therapeutics in multiple cancer types. ... targeting DNA damage response pathways, including PARP, ATM, ...
(Date:6/23/2016)... ... June 23, 2016 , ... ... its second eBook, “Clinical Trials Patient Recruitment and Retention Tips.” Partnering with experienced ... this eBook by providing practical tips, tools, and strategies for clinical researchers. , ...
(Date:6/23/2016)... , June 23, 2016 /PRNewswire/ - FACIT ... Ontario biotechnology company, Propellon Therapeutics ... development and commercialization of a portfolio of first-in-class ... Epigenetic targets such as WDR5 represent an exciting ... significantly in precision medicine for cancer patients. Substantial ...
(Date:6/23/2016)... ... June 23, 2016 , ... Charm Sciences, Inc. is pleased ... received AOAC Research Institute approval 061601. , “This is another AOAC-RI approval of ... Salter, Vice President of Regulatory and Industrial Affairs. “The Peel Plate methods perform ...
Breaking Biology Technology: