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Tag: "lineage" at biology news

Critical role in programmed cell death identified

...em, Conradt explained, with a well documented cell lineage that facilitates genetic manipulation. Their cell death machinery is simple, with one component for each of the different factors involved in the central cell killing apparatus. Mammals on the other hand have multiple components or families of protei...

UCSD team discovers specialized, rare heart stem cells in newborns

...d into the patient. Furthermore, the developmental lineage marker which identifies undifferentiated cardiogenic precursors suggests the feasibility of isolating isl1+ cardiac progenitors from mouse and human embryonic stem cell systems during cardiogenesis." "We think that these cells normally play an impor...

Fox Chase study shows that weakened T-cell receptor signals change T-cell lineage

...gesting a flexible new model for commitment to one lineage or another. The first, most basic career choice m...cells utilize distinct types of TCR complexes. One lineage employs pairs of TCR proteins termed alpha-beta while the other uses the TCR gamma-delta pair of pro...

Ancient DNA helps clarify the origins of two extinct New World horse species

...erican horses were thought to stem from a very old lineage of fossil forms in North America," Cooper says. "And instead, our data show that they probably diverged and moved into South America around three million years ago, during the great biotic interchange that occurred when the Panama Isthmus was establi...

Fungus-farming termites descend from an African rain forest Eve

...e occurred in which termites domesticated a single lineage of fungi, represented today by the genus Termitomyces, a white rot fungus. These fungi are some of the few organisms that can digest the plant component lignin. Within the termite colonies, which can grow very large, the fungus grows on a special str...

International Team Determines Geographic Origin of Leprosy

...-letter code. Scientists can use SNPs to trace the lineage of an organism, in this case M. leprae, and to develop a picture of how leprosy spread from its point of origin. The team looked for SNPs in 171 clinical specimens of M. leprae taken from people infected with the bacterium. The specimens came from 21...

'Punctuated' evolution in the human genome

...tion. During the divergence of the human/great-ape lineage from the Old World monkey lineage, the genome may have been particularly permissive to segmental duplication events. The scientists speculate that the molecular driving forces behind this "punctuated" duplicative activity may have been changes in tra...

Neanderthal teeth grew no faster than comparable modern humans'

...from about 150,000 to 30,000 years ago until their lineage failed for as-yet unknown reasons. Most researchers have argued that their life in extremely harsh, Ice Age-like environments, coupled with their limited technological skills, ultimately led to their demise. In a study published last year in the jo...

The roots of civilization trace back to ... roots

About five to seven million years ago, when the lineage of humans and chimpanzees split, edible root plants similar to rutabagas and turnips may have been one of the reasons. According to research by anthropologists Greg Laden of the University of Minnesota and Richard Wrangham of Harvard University, the ...

“Hitchhiking?Viruses as Cancer Drug Delivery System

About five to seven million years ago, when the lineage of humans and chimpanzees split, edible root plants similar to rutabagas and turnips may have been one of the reasons. According to research by anthropologists Greg Laden of the University of Minnesota and Richard Wrangham of Harvard University, the ...

Skull study sheds light on dinosaur diversity

...ra. New discoveries, however, are showing that one lineage of sauropods diversified at the end of the dinosau...of the dinosaur era, were really the only sauropod lineage that flourished. All the others went extinct," said Wilson, an assistant professor of geological sci...

New technology shows our ancestors ate…everything!

...been a dream of many researchers interested in our lineage to obtain this kind of information," continued Teaford. "And the computer software is phenomenal, the heart and soul of this project. We now have a reliable technology to quickly and accurately measure such surfaces." Teaford said future applications...

Human brain is still evolving

... of accelerated evolution along the entire primate lineage leading to humans, for the entire thirty to thirty...rred in Microcephalin and ASPM in the evolutionary lineage leading to humans, Lahn and his colleagues took the following approach: They determined the DNA sequ...

Picky female frogs drive evolution of new species in less than 8,000 years

... contact region where a population of the southern lineage had become isolated from the rest of its lineage and had developed a preference for certain male calls. The male frog call in this population has div...

Extinct giant deer's descendant found in UK

...erably since its prehistoric origins. Although its lineage can be seen in the antlers - the fallow deer has the same flattened antlers that the giant deer was renowned for - in size, the modern day deer is comparatively small. The giant deer (or Megaloceros giganteus - meaning gigantic antlers) lived from ...

Study Holds Promise For New Way To Fight HIV

...erably since its prehistoric origins. Although its lineage can be seen in the antlers - the fallow deer has the same flattened antlers that the giant deer was renowned for - in size, the modern day deer is comparatively small. The giant deer (or Megaloceros giganteus - meaning gigantic antlers) lived from ...

Ancient anthropoid origins discovered in Africa

...nstitute evidence of an ancestral crown anthropoid lineage there." According to Seiffert, the latest findings help fill in the gap between later anthropoids and the oldest undisputed anthropoid, called Algeripithecus, found in Algeria, which lived around 45 million years ago. That species had been character...

Did feathered dinosaurs exist?

...may be a separate clade, distinctive from the main lineage of Theropoda, a remnant of early avian radiation, exhibiting all stages of flight and flightlessness." ...

Ancient trans-Atlantic swarm brought locusts to the New World

...rca locusts. The team found that the desert locust lineage gave rise to the more than 50 Schistocerca species found in the western hemisphere. ...

Missing fossil link 'Dallasaurus' found

... forms. Dallasaurus represents a clear link to one lineage of the later forms and the first time researchers can clearly show mosasaurs evolved fins from limbs within the different lineages of mosasaurs. With the aid of computer science and SMU's visualization laboratory, Polcyn has been able to simulate wh...

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