The scientists grew groups of chickens under stressful conditions, where a randomly fluctuating day-night rhythm made access to food and resting perches unpredictable. This caused a marked decrease in the ability of the stressed birds to solve a spatial learning task. Remarkably, their offspring also had a decreased learning ability, in spite of being kept under non-stress conditions from the point of egg-laying. They were also more competitive and grew faster than offspring of non-stressed birds.
To investigate whether there was any genetic basis for the effect, the research group examined the expression levels of about 9000 genes in the brain of the chickens. In birds exposed to stress, there was a number of genes where the expression was either increased or decreased, and the same genes were similarly affected in the offspring.
The results therefore demonstrate that both the changes in gene function and the behavioural changes caused by stress were transferred to the offspring. Both these effects were only seen in domesticated chickens, not in the ancestor, the red junglefowl. The scientists therefore speculate that domestication may have favoured animals which are able to affect the biology of their offspring through genetic modifications.
The results offer new insights into how animal populations may be capable of adaptation to stressful environments in evolutionary short times. This can help explain both the rapid development of animals during domestication, and evolutionary responses to changing conditions in nature.
A Map of the Cell’s Power Station
18.08.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau
On the way to developing a new active ingredient against chronic infections
18.08.2017 | Deutsches Zentrum für Infektionsforschung
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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18.08.2017 | Life Sciences
18.08.2017 | Physics and Astronomy
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