Tag: "antagonistic" at biology news
Good for the goose, not so great for the gander
...exes played out on the genetic level called sexual antagonistic
pleiotropy. Because the mitochondrial genome (as well as the X chromosome) is inherited from the mother, evolutionary pressures might have selected for versions optimized for the female body. If the mitochondrial genome is better adapted to the f...
'Fruit fly dating game' provides clues to our reproductive prowess
...ot so simple, at least in their flies. If sexually antagonistic
genes, or genes that benefit one sex while harming...archers findings supports the notion that sexually antagonistic
genes exert powerful effects and mostly inhabit the X chromosome, which only females pass onto sons....
A little of what you fancy does you no good
...ally lower rates of reproductive success. Sexually antagonistic
genes, it appears, may have far-reaching effects o...ncur the cost of less-fit daughters. This sexually antagonistic
pattern challenges sexual selection theory predictions that female costs of reproduction are offset ...
Researchers identify neurons that assign value during learning
...ecomes attractive. These findings demonstrate that antagonistic
subsets of neurons are responsible for assigning p... interest to see whether this principal concept of antagonistic
neuronal populations mediating positive or negative values during learning holds true for much more ...
Researchers map out networks that determine cell fate
...esearchers were then able to identify both sets of antagonistic
secondary regulators. Egr-1 and Egr-2 activate macrophage and repress neutrophil genes. Gif-1 is required to turn on neutrophil genes and repress macrophage counterparts. Such counteracting repression circuitry may be the key to understanding ste...
Genetic tug of war determines sexual differentiation
...fate of the early gonads is controlled by mutually antagonistic
signals between Fgf9 and Wnt4." Since the Sry gene occurs only in mammals, it is possible that this antagonistic
signaling between Fgf9 and Wnt4 may be the mechanism that has remained common in the evolution of al...
War between the sexes influences evolution in some species, say scientists
...n the Z." The scientists explain that the sexually antagonistic
maternal-effect genes in ZW species lead to an evolutionary arms race. They state that maternal-effect conflict is increased in ZW species (compared with XY species) because the W, unlike the Y in humans, is expressed in both sexes through the mater...
Mutation in a single gene switches a fungus-grass symbiosis from mutualistic to antagonistic
...uch interactions range from mutually beneficial to antagonistic
and are considered to be of major ecological and e... species with Epichlo fungi can be mutualistic or antagonistic
or both. In the beneficial interactions, Epichlo endophytes are strictly limited in their intercel...
JCI table of contents October 1, 2005
...), Arsenic trioxide and retinoic acid (RA), can be antagonistic
in vitro. In a paper appearing online on September 22 in advance of print publication of the October 1 issue of the Journal of Clinical Investigation, the same group describes a mechanism by which this occurs. Wilson Miller and colleagues from Lady ...
Tips from the Journals of the American Society for Microbiology
...f the organisms native in the soil microflora have antagonistic
effects against pathogenic bacteria introduced into soil." (G.S. Johannessen, G.B. Bengtsson, B.T. Heier, S. Bredholt, Y. Wasteson, L.M. Rorvik. 2005. Potential uptake of Escherichia coli O157:H7 from organic manure into crisphead lettuce. Applied ...
A puzzle posed by black-headed ducks yields to persistent biologists
...highly successful brood parasite, unopposed by the antagonistic
strategies that host species deploy against more costly parasites like cuckoos and cowbirds. Instead, they found that black-headed duck eggs are often rejected from host nests, and it took four years of detailed field research to figure out why. Lyon...