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Tag: "origin" at biology news

Stolen gene allows insect virus to enter cells

...enes were probably copied from host cells, but the origin of so-called fusion proteins, like F, has remained a mystery. "The gigantic step was when the Drosophila melanogaster [fruit fly] genome was published," Blissard says. "The first thing was to ask whether the gene was turned on or not, to validate wh...

Tissue regeneration operates differently than expected

...ds of cell types. Embryonic stem cells provide the origin of a developing organ, during the growth of an embryo. For example, mesenchymal cells ?stem cells from embryonic connective tissue ?transform themselves during embryogenesis into muscle cells, under the influence of certain growth factors. Other ste...

Human brain is still evolving

...these genes arose at roughly the same times as the origin of culture in human populations as well as the adv...,000 years ago. "In the case of Microcephalin, the origin of the new variant coincides with the emergence of culturally modern humans," said Lahn. "And the AS...

Complex gene interactions account for autism risk

...he GABA receptor genes, GABRA4, is involved in the origin of autism. Moreover, they report, GABRA4 appears to increase autism risk through its interaction with a second GABA gene, GABRB1. "This is a key finding for our understanding of the complexity of interactions that underlie autism," Pericak-Vance sai...

Ancient anthropoid origins discovered in Africa

...eing very significant for our understanding of the origin of anthropoid activity patterns." According to Simons, analyses of the teeth of the two species clearly place them as members of a group called parapithecoids, known as "stem" anthropoids because they constitute the species of early creatures from w...

Newly discovered birdlike dinosaur is oldest raptor ever found in South America

...ng the changes in body proportions that led to the origin of birds and flight." ...

Stem cell microenvironment reverses malignant melanoma

...normal melanocyte-like cell, the skin cell type of origin for melanoma. The model, which was developed in Hendrix's laboratories, consists of a three-dimensional collagen matrix preconditioned by hESCs, followed by their removal and subsequent application, or seeding, of metastatic melanoma cells onto the ...

Did feathered dinosaurs exist?

...ce of the Chinese discoveries with respect to bird origin and flight. The authors emphasize that the total... ever to solve the mystery of bird origins and the origin of avian flight. From their careful examination of the available evidence they offer an interim atte...

Missing fossil link 'Dallasaurus' found

...ow know the significance of Turner's fossil as the origin of an extinct line of lizards with an evolutionary twist: a land-dwelling species that became fully aquatic. Turner took the remains to paleontologists at the Dallas Museum of Natural History, but it took several years before scientists dubbed the f...

Same-sex mating by fungi spawned infection outbreak, evidence suggests

...ings provide important additional insight into the origin of the Vancouver Island outbreak, which began in 1999. Moreover, the evidence that sex played an important role in the pathogen's expansion may provide a useful model for the evolution of infectious diseases and parasites more generally, they said. ...

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

...ce 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 first became interested in primate prodynorphin after notic...

Finding rewrites the evolutionary history of the origin of potatoes

...dison has for the first time demonstrated a single origin in southern Peru for the cultivated potato. The s...the cultivated potato, we have identified a single origin from a broad area of southern Peru," says Spooner, who is also a UW-Madison professor of horticultur...

Genes involved in biofilms

...echanisms for forming biofilm as a function of the origin of the bacteria strains, as a consequence of which it was decided to widen the scope of the research, using a strain of Staphylococcus aureus from otitis media. For the identification of the genes involved in the formation of the biofilm of this ...

Why the Amazon rainforest is so rich in species

...orest refuges during the ice ages were causing the origin of new species ?the reason normally given. Instead, we think that idiosyncratic features of the biology of each species, such as competition for food and their individual reactions to the environment dictate the pattern of evolution in each group." ...

Alleged 40,000-year-old human footprints in Mexico much, much older than thought

...al Society Web site as saying, "Accounting for the origin of these footprints would require a complete rethink on the timing, route and origin of the first colonization of the Americas." Renne, Knight, Waters and the Mexico City archeologists...

Birth defects: 8 million annually worldwide

...born with serious birth defects of post-conception origin due to maternal exposure to environmental agents, ...mmon birth defects of genetic or partially genetic origin combined accounted for about 26 percent of all such birth defects in 2001: congenital heart defects ...

Powerful new tool for studying brain development

...o study the development of the human brain and the origin of brain tumors from gene mutations, according to ... was key to the success of a St. Jude study of the origin of human brain tumors in children. The team used a technique called microarray analysis to study gen...

Ocean virus identified in human blood samples

A virus of ocean origin that can cause a range of diseases in several animal species has been found in human blood samples. The virus, or antibodies to it, was found most often in the blood of individuals with liver damage, or hepatitis of unknown cause related to blood exp...

Rutgers researchers find fat gene

..., allowing them to backtrack along the path to its origin ?the gene that coded it ?linking the enzyme to the yeast gene PAH1 that made it. Carman and his group went on to confirm the link by introducing the yeast gene into bacteria, with similar results. The researchers showed that the enzyme encoded by th...

Supersized 'island' of resistance genes discovered in an infectious bacterium

...er bacteria," Claverie said. The study traced the origin of many resistance genes to other bacteria, including Salmonella, indicating frequent genetic swapping between bacteria. Resistance genes are usually located on small auxiliary circles of DNA called plasmids that can be exchanged with other individu...

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