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Tag: "divergence" at biology news

Loss of a universal tRNA feature reported

...the extra guanylate in tRNAHis is a unique case of divergence from a highly conserved ancient tRNA recognition mechanism by an aminoacyl-tRNA synthetase. It will be of special interest to examine if the loss of this tRNA feature has resulted from the presence of an RNase P enzyme that is no longer capable of ca...

Scientists discover new life forms in the Arctic Ocean

...known groups," explains Dr. Lovejoy. "In fact, the divergence of this group from known organisms is as great as the difference between land plants and animals," adds the scientist. Over this last year the team has been scouring data bases, verifying their results and applying new techniques to their samples. ...

Studies yield insight into the numerical brain

... particular at which stage such a representational divergence appears. Such findings could contribute significantly both to the field of numerical cognition research and rehabilitation of people suffering from developmental dyscalculia," they wrote. ...

No sex for 40 million years? No problem

...er millions of years, natural selection has caused divergence into distinct entities equivalent to the species f..."Our proof that natural selection has driven their divergence into distinct species is another example of these miniscule creatures surprising scientists ?and the...

Cities change the songs of birds

...y the environment. The authors point out that song divergence within a species as a result of such “environmental shaping?could potentially play a crucial role in the process of speciation, although it is not at all clear whether urban and forest populations of great tits are on such a path. Conservation I...

Genetic study of Neanderthal DNA reveals early split between humans and Neanderthals

...he investigators to estimate the human-Neanderthal divergence timeline. The scientists also used data from the HapMap genome project to understand the relationship between modern human diversity and the Neanderthal sequence. Their analysis showed that the Neanderthal sequence could not have come from any mode...

A new look at the state of the oceans

...between biological species, but also refers to the divergence within established species. This leads to a completely new evaluation of the species concept. For the recording and description of new species, fast access to existing information is absolutely imperative. ...

Scientists elucidate the kinome of key model organism

... the evolutionary history of the metazoa after the divergence of the plants but before that of the fungi. "Our findings document the impressive evolutionary creativity of the Dictyostelium kinome- a large portion of the kinases are unique to Dictyostelium, and are probably involved in unique aspects of this or...

Where 'jumping genes' fear to tread

...or to ?and have been largely maintained since ?the divergence of eutherian mammals and marsupials approximately 170 million years ago." The opossum was chosen for inclusion in the analysis because it is a marsupial that has a similar load of transposable elements compared to mice and humans but is evolutionari...

Dog genome sequenced

...dog and human chromosomes. Since the evolutionary divergence of dogs and humans approximately 95 million years ago, canine chromosomes have undergone considerable breakage relative to other species. In contrast to the 46 chromosomes present in each human cell, dogs possess 78 chromosomes, but each set essenti...

Scientists fetch useful information from dog genome publications

...dog and human chromosomes. Since the evolutionary divergence of dogs and humans approximately 95 million years ago, canine chromosomes have undergone considerable breakage relative to other species. In contrast to the 46 chromosomes present in each human cell, dogs possess 78 chromosomes, but each set essenti...

Scientists narrow the time limits for the human and chimpanzee split

...olecular and fossil studies, which have placed the divergence anywhere from 3 to 13 million years ago. The scie...sign Institute at Arizona State University. "This divergence time also has considerable importance because it is used to establish how fast genes mutate in human...

Carnegie Mellon scientists create PNA molecule with potential to build nanodevices

...splay similar patterns of changes, and whether the divergence between human and chimp patterns was the direct result of selection, or was an inevitable consequence of some other difference in brain evolution. The patterns seen in this study also provide a starting point for understanding the network of genetic ...

Navigating the brain for sense of direction as paradigm for higher cognitive functions

...splay similar patterns of changes, and whether the divergence between human and chimp patterns was the direct result of selection, or was an inevitable consequence of some other difference in brain evolution. The patterns seen in this study also provide a starting point for understanding the network of genetic ...

Gene Expression in the Aging Brain

...splay similar patterns of changes, and whether the divergence between human and chimp patterns was the direct result of selection, or was an inevitable consequence of some other difference in brain evolution. The patterns seen in this study also provide a starting point for understanding the network of genetic ...

'Perception' gene tracked humanity's evolution, scientists say

...us among evolutionary anthropologists that hominid divergence from the other great apes was fueled not by the origin of new genes, but by the quickening (or slowing) of the expression of existing genes. Hahn and his colleagues at Duke University, University College London and Medical University of Vienna firs...

A bug's life: Exceptional genomic stability yet rapid protein evolution in a carpenter ant mutualist

...tion, as measured by amino acid changes, since the divergence of B. pennsylvanicus from their free-living ancest...ia species exhibited different rates of evolution; divergence rates were approximately two times faster in B. floridanus than in B. pennsylvanicus. The authors su...

Human brain is still evolving

... six million years of hominid evolution, after the divergence of humans and chimpanzees." In order to identify sequence changes that occurred in Microcephalin and ASPM in the evolutionary lineage leading to humans, Lahn and his colleagues took the following approach: They determined the DNA sequences of the tw...

'Punctuated' evolution in the human genome

... This corresponds to the time period following the divergence of humans and Old World monkeys, but before the divergence of humans and great apes. For the past 10 million years, however, no such "duplicative seeding" even...

Can our genes tell the story of our divergence?

...th species should harbor genetic footprints of our divergence ?the subject of a recent study in the premier open-access journal PLoS Biology. One way to find such genetic signatures is to search for genes that reveal signs of positive natural selection. The assumption is that genes touched by positive selectio...

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