Genetics & Molecular Biology
Walter Fontana, a Professor of Systems Biology at Harvard, reflects on models in biology:
Models will play a central role in the representation, storage, manipulation, and transmission of knowledge in systems biology. Models that are capable of fulfilling all these purposes will likely differ from the familiar styles deployed with great success in the physical sciences. "Classical" flavors of models may be viewed on a continuum between two major types:
Models that are of heuristic nature. Although formal (mathematical), these models are not primarily intended for data analysis. They represent…
Johns Hopkins scientists have discovered that common but hard-to-see sugar switches play an important role in cell division. Because these previously unrecognized sugar switches are so abundant and potential targets of manipulation by drugs, the discovery of their role has implications for new treatments for a number of diseases, including cancer, the scientists say.
In the January 12 edition of Science Signaling, the team reported that it focused efforts on the complicated biochemical machine involving hundreds of proteins that enables a human cell to split into two. Conventional wisdom was…
Scientists have long known that sperm's activity level depends on their internal pH. And now researchers writing in Cell say they have found the channel that allows the tiny cells to rid themselves of protons. Once in the female reproductive tract, that proton release changes their internal environment from acidic to alkaline and begins their race to the finish line. The findings offer new insight into a critical event in human fertilization and may lead to new ways of controlling male fertility.
"The concentration of protons inside the [sperm] cell is 1,000 times higher than outside," said…
A new study published today in Nature suggests that approximately seven in every thousand morbidly obese people are missing a section of their DNA containing approximately 30 genes, which may be having a dramatic effect on their weight.
Researchers identified the missing genes in teenagers and adults who had learning difficulties or delayed development. They found 31 people who had nearly identical 'deletions' in one copy of their DNA. All of the adults with this genetic change had a BMI of over 30, which means they were obese.
A study the genomes of 16,053 people who were either obese or…
The 'primordial soup' theory--which posits that early life began in a soup of organic molecules before evolving out of the oceans millions of years later--is fatally flawed, according to researchers writing in BioEssays. Instead the authors claim it was the Earth's chemical energy, from hydrothermal vents on the ocean floor, which kick-started early life.
In rejecting the soup theory the team turned to the Earth's chemistry to identify the energy source which could power the first primitive predecessors of living organisms: geochemical gradients across a honeycomb of microscopic natural…
Saving the World Several Viruses at a Time.
In a press release today, UCLA announced the discovery of a "a broad spectrum anti-viral" - a chemical compound that may be effective against many viruses both known and unknown. The press-release disclosed the publication of thefirst paper leading from the study, published online in Proceedings of the National Academy of Science.
UCLA Medical School researcher Dr. Benhur Lee (full disclosure - he's my life-partner) was the lead P.I. on the project, a collaboration between scientists from the University of Texas at Galveston, Harvard…
This paper relates some neat work done at the University of Texas to understand signal processing by beta-adrenergic receptors:
In layman's terms:
The β2 adrenergic receptor (β2AR) is involved in regulating many cellular processes such as smooth muscle relaxation in the airways and the vasculature. Drugs that activate the β2AR are used in treating asthma and chronic obstructive pulmonary disorder (COPD), and prolonged use of these drugs leads to the loss of their effects. Thus, a dynamic model of how the β2AR responds to different drugs is fundamental to their rational use. In this study a…
No vaccine currently exists for West Nile Virus, but a new therapeutic made from tobacco plants has been shown to arrest the infection, according to research conducted by Arizona State University scientists. The study, published this week in PNAS, is the first to demonstrate a plant-derived treatment to successfully combat West Nile virus after exposure and infection.
"The goal of this research was twofold," said Arizona State University scientist Qiang Chen. "First, we wanted to show proof-of- concept, demonstrating that plant-made antibodies can work as effective post-exposure…
Scientists from the University of Gothenburg, Sweden say they have discovered how aged yeast cells manage to form new and undamaged daughter cells. In a study published in Cell, two collaborating research groups at the Department of Cell and Molecular Biology have been able to show how newly formed yeast cells transport damaged and aged proteins back to the mother cell, guaranteeing that the new cell is born young and healthy.
"Previously it was believed that these structures allowed only one-way traffic of proteins and organelles from mother cell to daughter cell," says professor Thomas…
Many significant “discoveries” science will make in the coming decade have actually already been made. The synthesis of some of these revelations in the ‘teens, and the synergistic results of this work will change the world as we know it. A sampling of these discoveries can be clustered in three domains: transgenic research, bio-computation and satellite technology.
Transgenic research
Since the identification of the structure of DNA in the 50s, our learning curve on the manipulation of genetic molecules has been nearly exponential. It is now possible to…