Posted on July 17, 2009 by TCS
Previously, it was considered to be axiomatic that all cells in the human body contained the same DNA. However, recent research found differences between the DNA contained in blood cells and other tissue in the body.
This discovery may undercut the rationale behind numerous large-scale genetic studies conducted over the last 15 years, studies which were supposed to isolate the causes of scores of human diseases.
Except for cancer, samples of diseased tissue are difficult or even impossible to take from living patients. Thus, the vast majority of genetic samples used in large-scale studies come in the form of blood. However, if it turns out that blood and tissue cells do not match genetically, these ambitious and expensive genome-wide association studies may prove to have been essentially flawed from the outset.
This discovery sprang from an investigation into the underlying genetic causes of abdominal aortic aneurysms (AAA) led by Dr. Morris Schweitzer, Dr. Bruce Gottlieb, Dr. Lorraine Chalifour and colleagues at McGill University and the affiliated Lady Davis Institute for Medical Research at Montreal’s Jewish General Hospital. The researchers focused on BAK, a gene that controls cell death.
What they found surprised them. AAA is one of the rare vascular diseases where tissue samples are removed as part of patient therapy. When they compared them, the researchers discovered major differences between BAK genes in blood cells and tissue cells coming from the same individuals, with the suspected disease “trigger” residing only in the tissue. Moreover, the same differences were later evident in samples derived from healthy individuals.
“In multi-factorial diseases other than cancer, usually we can only look at the blood,” explained Gottlieb, a geneticist with McGill’s Centre for Translational Research in Cancer. “Traditionally when we have looked for genetic risk factors for, say, heart disease, we have assumed that the blood will tell us what’s happening in the tissue. It now seems this is simply not the case.”
It remains to be seen how many other differences will be discovered. But what is certain, is that a whole other layer of complexity has been added to the enormous complexity of biological systems. Yet we are told that there is “no evidence of design or a Designer.”
Filed under: evolution, Intelligent Design | Tagged: complexity, DNA, evolution, functional complexity, Intelligent Design | Leave a comment »
Posted on September 15, 2008 by TCS
One way of thinking about DNA is it’s information storage ability. DNA has an information storage capacity that is far beyond anything devised by humans for the amount of space that is used (information storage density). The information stored in DNA is essentially digital in nature. With computer technology, information is stored as a series of 0’s and 1’s. With DNA, the information is stored as a series of 4 different types of base molecules. All information needed for the construction of a biological organism is contained in DNA. But DNA does nothing on it’s own. Imagine taking your hard drive out of your computer. It’s useless. The same with DNA removed from a cell. There are many more functional components of a cell that are required to read the information, construct proteins from information contained in DNA, power generation, and so forth. Cells also contain error correction processes for reading DNA, just as computer technology contains processes for error correction.
Utterly, any analogy that we might try to utilize to explain the complexity of what happens in a living cell will fail. We have designed nothing of that comes close to the sophistication of a living cell. All of these functions on a cellular level are carried out with no intelligence actively guiding the process. However, all of these functions exhibit what I would call hallmarks of intelligent processes. In other words, intelligence is exhibited in the design and function of life. Life at any level of analysis exhibits something akin to intelligence. Their is an increasing trend in biology toward discovering ever increasing complexity at a cellular level. I happen to believe the miraculous is possible, but the miracle required for life to self-organize from non-living matter to living matter is beyond the level to which I can extend my faith.
Filed under: abiogenesis, evolution, Intelligent Design, nanotechnology, Technology | Tagged: abiogenesis, biology, digital coding, DNA, evolution, Intelligent Design, Technology | Leave a comment »
Posted on September 14, 2008 by TCS
I loved John Cleese in all of the Monty Python movies and shows. In this video, he talks about Genetic Determinism.
Filed under: atheism, Creationism, evolution, Intelligent Design, psychology, Religion, science, theology | Tagged: biopsychology, chemistry, DNA, evolution, genetic determinism, genetics, Intelligent Design, naturalism, psychology, science | Leave a comment »