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Important Genetic Variation Connected To Malaria Resistance
Researchers at the Duke University Institute for Genome Sciences & Policy have found that variation in the same gene in humans and baboons produces the same kind of disease resistance. The findings were published in the June 24 online edition of the journal Nature.
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Obama Highlights Health Care Reform Progress In Weekly Address
In his weekly radio and Internet address, President Obama discussed efforts by congressional leaders and health care industry groups on health care reform legislation, The Hill reports. He said that "while there remains a great deal of difficult work ahead, I am heartened by what we have seen these past few days: a willingness of those with different points of view and disparate interests to come together around common goals -- to embrace a shared sense of responsibility and make historic progress" (Youngman, The Hill, 5/16). He said, "I have always believed that it is better to talk than not to talk, that it is far more productive to reach over a divide than to shake your fist across it," which has "been an alien notion in Washington for far too long, but we are seeing that the ways of Washington are beginning to change."In the Republican radio and Internet address. Rep. Charles Boustany (R-La.), a cardiovascular surgeon, said that a "government takeover of health care will put bureaucrats in charge of health care decisions that should be made by families and doctors." He added, "It will limit treatment options and lead to rationed care," and "to pay for government health care, your taxes will be raised." Boustany, a member of the House Republican Health Care Solutions Group, said, "That is something we cannot support, and frankly, it would clearly violate some of the principles the president himself has endorsed" (Superville, AP/Washington Post, 5/16). In related news, Office of Management and Budget Director Peter Orszag on Sunday said on CNN"s "State of the Union" that the administration might support taxing health care benefits to health pay for health care reform (Barr, Politico, 5/17). Timeline
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33,902 Swine Flu A(H1N1) Cases Including 170 Deaths In USA
The Centers for Disease Control and Prevention (CDC) informed in its weekly update on Friday evening, 3rd July, 2009, that the total number of confirmed human cases of swine flu A(H1N1) infection stands at 33,902, including 170 deaths.
Diagnostics

Gene Variations Can Be Barometer Of Behavior, Choices

Researchers at Brown University and the University of Arizona have determined that variations of three different genes in the brain (called single-nucleotide polymorphisms) may help predict a person"s tendency to make certain choices. By testing DNA samples from saliva in conjunction with computerized cognitive tests, researchers found that the certain gene variations could be connected to certain choices - focusing on decisions that previously produced good outcomes, avoiding negative outcomes, or trying unfamiliar things even though an outcome is uncertain. "In some cases, single genes can have surprisingly strong influences on particular aspects of behavior," said Michael J. Frank, assistant professor of cognitive and linguistic science, psychology, and psychiatry and human behavior. Frank, lead author of the research, directs the Laboratory for Neural Computation and Cognition in the Brown Institute for Brain Science. Frank worked with Brown graduate student Bradley Doll and collaborated with geneticists Francisco Moreno and Jen Oas-Terpstra of the University of Arizona. Research findings will be published in the August 2009 Nature Neuroscience and will be available online July 20. The paper builds on research Frank conducted while he was at the University of Arizona. The study examined the effects of three genes that control aspects of dopamine function in the brain while participants performed a computerized decision-making task. Dopamine is a neurotransmitter that helps keep the central nervous symptom functioning. Its levels fluctuate as the brain feels motivated or rewarded. Varations in two of the genes - DARPP-32 and DRD2 - independently predicted the degree to which people responded to outcomes that were better or worse than expected, by reinforcing approach and avoidance type behaviors. These genes affect dopamine processes in the basal ganglia portion of the brain. Frank said this is important for "simple reinforcement of learning processes that you might not even be aware of." Frank and the other researchers also studied exploratory decision-making - the choices people make when they are in "uncharted territory." They found that variations in a third gene - COMT - predicted the extent to which people explored decisions when they were uncertain whether the decisions might produce better outcomes. COMT affects dopamine levels in the prefrontal cortex, known as an executive center of the brain. Frank said this level might be needed to "prevent the more basic motivational learning system from always taking control over behavior, so as to gather more information and prevent getting stuck in a rut." Frank said the findings could have some interesting implications. "We cannot say on the basis of one or two studies," he said, "but if a student isn"t doing well in a particular learning environment, [a gene study could show that the student] may be well-suited to a particular teaching style." The data could help shape future treatments for conditions such as Parkinson"s disease, which involves dopamine loss. Treatment options now lead to unwanted side effects. "Medications that increase dopamine stimulation can help treat debilitating aspects of the disease but in some patients the meds can induce pathological gambling and impulsivity," he said. Frank suggested that genetic factors involved in influencing motivational processes in the brain could someday help predict which patients would be negatively impacted by particular medications. Seventy-three college students, with a median age of 19, took part in the study. Scientists took saliva samples, from which they extracted DNA and analyzed the genes with subsequent computerized cognitive tests. Subjects watched a clock face, on which the arrow revolved around for five seconds, during which the subjects were to press a button once to try to win points. The subjects did not know that the statistics of their reward depended on their response time, and they had to learn to adjust their responses to increase the number of points they could win. That data was then fed into a biologically based computer model that quantified the learning and exploration processes on a trial-by-trial basis. These variables were then compared against different genes. A grant from the U.S. National Institutes of Mental Health funded the research. Mark Hollmer Brown University


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