Tag: "junk" at biology news

A fishy change in diet

The junk food phenomena has hit bottom- the bottom of the S...d on invasive European quagga mussels: the River's junk food. This change may have negative effects on fish growth and may also affect other freshwater anim...

Researchers look into components of RNA silencing machinery

... to 95 percent of a person's DNA is believed to be junk DNA. In order to prevent these relics of evolution from rearranging chromosomes and causing disease, natural mechanisms exist to silence them, according to contemporary theories of chromosome biology. The RNA silencing machinery silences gene expr...

Junk DNA yields new kind of gene

...ifficult-to-detect form of control. And given that junk DNA makes up 95 percent of chromosomes, the mechan...minds that someday they would have to contend with junk DNA, but it was not their intention to map a new gene in those wild and relatively uncharted regions...

Life goes on without 'vital' DNA

...lly more conserved sequences within the deserts of junk DNA, which does not code for proteins. The thinki...boratory in California deleted two huge regions of junk DNA from mice containing nearly 1000 highly conserved sequences shared between human and mice. One ...

NIST-led research de-mystifies origins of 'junk' DNA

...more space than the functional parts. Much of this junk consists of "introns," which appear as interruptions plopped down in the middle of genes. Discovered in the 1970s, introns mystify scientists but are readily accounted for by cells: when the cellular machinery transcribes a gene in preparation for ma...

A new hypothesis on the origin of 'junk' DNA

...o bacteria, and we believe this is the main reason junk DNA sequences are still with us." Junk DNA dominat...h said. While some of what geneticists have called junk DNA is turning out to be not so junky after all, Lynch said a substantial fraction of such genetic m...

New scheduling method raises efficiency of electronics recycling

...rs. The more than 1.5 billion pounds of electronic junk processed annually includes about 40 million discarded computer components like printers, monitors and CPUs, according to a report issued earlier this year by the association. The association report estimates that about 1 billion units of obsolete co...

Common nutrients fed to pregnant mice altered their offspring's coat color

...lls use methylation as a means to inactivate these junk transposons and prevent their replication. Yet if the transposons have inserted themselves in or near a functional gene, the gene can be inadvertently methylated, too, thereby reducing its expression. The scientists demonstrated that such inadvertent...

American Physical Society March Meeting 2003

...o be filler. Nevertheless it is important to study junk DNA to understand why we seem to have so much of it, whether it has a purpose, and what that purpose might be. It is also vital to distinguish it from the portions of the genome that contain protein coding DNA. In paper N10.1, Gene Stanley of Boston ...

Jewels that may help explain behavioral disorders found among 'junk' DNA

...genes that code for proteins that have been called junk DNA form a powerful network that can turn ordinary genes on and off at the proper times. "It appears that smnRNA may be especially relevant for understanding behavioral differences," McInnes said, "because they appear to be particularly enriched in...

Photosynthesis analysis shows work of ancient genetic engineering

...tion in bacteria is kind of like what happens at a junk dealer," said Blankenship. "Bits and pieces of whatever there is out in the yard get hauled back and welded together and made into this new thing. All these metabolic pathways get borrowed and bent a bit and changed." Blankenship points out that natu...

UF study suggests schools boost empty calories to raise test scores

...y pumping up their pupils with extra calories from junk food, a study conducted at the University of Florida suggests. The study, published this month in the National Bureau of Economic Research's online working paper series, found that on test days many districts fed students high-energy foods with low ...

Essential cell division 'zipper' anchors to so-called junk DNA

...control genetic activity, sometimes referred to as junk DNA. "One thing that interested us is that there are 500 thousand to 1 million Alu repeats across the human genome," says Ramin Shiekhattar, Ph.D., an associate professor at The Wistar Institute and senior author on the Nature study. "These sequences...

Jumping genes can knock out DNA; alter human genome

...of a new University of Michigan study suggest that junk DNA dismissed by many scientists as mere strings ... that, in cultured human cancer cells, segments of junk DNA called LINE-1 elements can delete DNA when they jump to a new location possibly knocking out ge...

Genome protects itself against mobile junk DNA

...almost half of the human DNA. They are also termed junk DNA, as they probably have no function. Transposons are probably remnants of viruses from the past. In some aspects the AIDS virus is similar to a transposon....

Parasite or partner? Study suggests new role for junk DNA

...ature Genetics, however, suggests that segments of junk DNA called LINE-1 elements deserve more respect. Conducted by scientists from the University of Michigan Medical School and Louisiana State University, the study is the first to show in mammalian cells that some human LINE-1, or L1, elements can ju...

Scientists find hidden piece of influenza virus

... goes awry, Dr. Yewdell explains. In other words, junk peptides result from genetic mistakes. "We weren...system cells had learned to recognize any of these junk peptides. We thought that was an interesting question." The immune system cells of mice, in fact,...

NSF awards University of Georgia $8.7 million for crop genetics research

...es along the chromosomes, the density of genes and junk DNA, and the levels of diversity in genes that are found in natural populations of plants. Theres a lot known now about the human genome, for example, as the result of sequencing but there will be much more learned as the sequence is placed within ...

UC Davis science newstips Feb 01

...ces that do not code for proteins. But one type of junk DNA, called Alu repeats, could help control how other genes are turned on and off, according to molecular biologist Carl Schmid of the University of California, Davis. Schmid's laboratory at UC Davis discovered the Alu repeat in 1979. The new maps s...

Wistar scientists add difficult-to-sequence stretches to human genome data

...essential functions and are not simply dispensable junk DNA," Riethman says. In their study, the scientists succeeded in connecting 34 of 46 telomeric regions to the working draft human genome sequence. Twelve telomere ends still remain to be connected. Seven of these 12 remaining telomeres could not be c...

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