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Tag: "variations" at biology news

Identified main genetic variants involved in response to HIV

...and bioinformatics technologies, analysing 550,000 variations of the complete human genome in 486 patients, most...simple nucleotide polymorphisms (SNPs), are single variations affecting only one nucleotide or base of the genomic sequence. Despite humans sharing 99.9% of the g...

The insect vector always bites twice

...iseases, are linked to ecosystem changes, climatic variations or pressure from human activities. Malaria, sleeping sickness and so on lead to the death of millions of people in the world. African countries are particularly strongly hit. The expansion of Dengue fever and the recent epidemics of Chikungunya and W...

Research team identifies new Alzheimer's gene

...neously examined more than 500,000 SNPs or genetic variations to characterize and confirm additional LOAD suscep...scientists to better identify the specific genetic variations associated with complex diseases,” said Kevin King, President of Life Sciences Business and Executiv...

Genetic factors are linked to fever following smallpox vaccination

...an important preliminary step in understanding the variations in host responses to vaccines, and notes that further studies will need to replicate these findings, and to test other vaccines. Both Drs. Stanley and Crowe mention that the results may have important implications when it comes to the future goal of...

Gene responsible for common hearing loss identified for first time

...polymorphism) analysis, or looking at DNA sequence variations occurring in a single nucleotide, A, T, C or G, to study a large patient and control population from Belgium and The Netherlands. They found significant results for an amino acid changing SNP inTGBF1, and that this remained significant after correcti...

Pistachios lower cholesterol, provide antioxidants

...k break between each diet. All three diets were variations on the Step I Diet, a cholesterol-lowering diet in general use. The diets included a Step I Diet without pistachios which had 25 percent total fat and 8 percent saturated fat; a Step I Diet including 1.5 ounces of pistachios per day which had 30 perc...

Arctic ice retreating more quickly than computer models project

...reenhouse gases, and the other half due to natural variations in the climate system, the new study indicates that greenhouse gases may be playing a significantly greater role. There are a number of factors that may lead to the low rates of simulated sea ice loss. Several models overestimate the thickness of ...

Salk scientists hammer out a pathway that promotes muscle cell survival in mice

... not just mice, and even worms and fruit flies use variations of the enzyme. And as Montminy adds, "Application of this same pathway over and over across species further emphasizes its importance."...

'Personality-gene' makes songbirds curious

... B, 2 May 2007). There is already evidence that variations (polymorphisms) in neurotransmitter-related genes are associated with personality differences among humans. Research from the last decade suggested a promising link between the Drd4-gene and the trait curiosity (novelty-seeking). Scientists from the ...

Gene malfunctions cause schizophrenia, depression symptoms in mice

... The researchers' theory was that different mutant variations of DISC1 might have different pathological effects. To test this theory, the researchers screened a large population of mouse mutants to isolate two with different mutations in DISC1. They found that, indeed, one of the mutant mouse strains exhibi...

Genetic roots of bipolar disorder revealed by first genome-wide study of illness

...depends in part on the combined, small effects of variations in many different genes in the brain, none of whic...he study is the first to scan virtually all of the variations in human genes to find those associated with bipolar disorder. Results were published online May 8 ...

Survival of the rarest: Fruit flies shed light on the evolution of behavior

...mice and humans, the researchers are examining how variations in the human foraging gene may be linked to food-related disorders. ...

Do fruit flies have free will?

...nction in the fly brain which leads to spontaneous variations in fly behavior" Sugihara said. "The results of our analysis indicate a mechanism which might be common to many other animals and could form the biological foundation for what we experience as free will". Our subjective notion of "Free Will" is an...

Individuals and populations differ in gene activity levels, not just genes

...ians versus Europeans, for instance ?more of those variations are due to individual-level factors, further obscu...e of European and African ancestry, cataloging the variations between those individuals. They studied each person's levels of gene expression, which measures how ...

In young mice, gregariousness seems to reside in the genes

...ng juveniles of the two mouse strains - behavioral variations that could only be explained by genetic differences. Intriguingly, the Wisconsin researchers also found that young mice from the gregarious strain seek environments that predict the possibility of a social encounter and avoid places where they ha...

Stanford-led study closes in on genes that may predispose some people to severe depression

...epression," said Levinson. If problematic genetic variations could be identified, it would open the door to a ...re genes in which there are specific DNA sequence variations that affect one's risk of depression, then we would be able to understand what type of gene is it,...

In obesity, brain becomes 'unaware' of fat

..., body weight is relatively constant despite large variations in daily food intake and energy expenditure, Cowley explained. Energy balance is regulated by neural and hormonal signals that are integrated in the brain. Leptin sends signals to the brain about the body’s fat reserves, modifying appetite and ene...

Major gene study uncovers secrets of leukemia

...ms. Single nucleotide polymorphisms are individual variations in the DNA that are spaced across the human chromosomes. Single nucleotide polymorphisms function as flags for researchers, allowing them to detect specific deletions of DNA in a gene or increases in the number of specific genes at a level of detail ...

Mimicking how the brain recognizes street scenes

...pose, illumination, size, position, and many other variations in appearances. Even a child's brain handles these contradictory tasks easily in rapid object recognition. Pixel-like information enters from the retina and passes in a fast feed-forward, bottom-up sweep through the hierarchical architecture of th...

Gene variations contribute to aggression and anger in women

...hostility and aggression may be genetic, rooted in variations in a serotonin receptor gene. Indrani Halder, Ph.D...y is the first to look at the relationship between variations in the serotonin receptor 2C gene and anger and hostility. Completed at the University of Pittsbu...

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