|Speaker:||William A. Haseltine, Human Genome Sciences, Inc.|
|Topic:||“Genes A New Measure of Man”|
The President, Mr. Ohlmacher, called the 2038th meeting to order at 8:27 p.m. on January 20, 1995. The Recording Secretary read the minutes of the 2036th meeting and they were approved with a correction. The President then read a portion of the minutes of the 430th meeting January 19, 1895.
The President introduced Mr. William A. Haseltine, President, Human Genome Sciences to discuss “Genes A New Measure of Man”.
It had long been observed that “like begets like”, but close observation of how inheritance of measurable traits really appeared to work (by Gregor Mendel and his successors after 1900) led to an initial, abstract definition of the gene. A gene is a discrete, nonmiscible, heritable trait. The nonmiscible aspect is most evident in the reappearance of recessive traits in the offspring of hybrid parents. DNA is now recognized as the physical material that embodies the abstract concept of genes. The most fundamental characteristic of DNA as the material of genes is that it manages to duplicate itself exactly on an atomic scale. Our current understanding leads us to a physical and functional definition of the gene. A gene is a length of DNA that specifies the biochemical instructions to make something, like a protein. When occasionally a new trait does appear, there has been a variation in the structure of a gene, a mutation, resulting in a change in a single piece of information, and altered instructions have led to the production of a different product.
The new medicine enabled by these advances uses our own genes or gene products to correct or overcome disease. We now have the means through genetics to produce human proteins in other organisms, and harvest those proteins to use as drugs. Genetics can be used to predict future health patterns and problems. To continue these advances and use them effectively it is important that we have and be able to understand the total collection of human genes. The Human Genome Project began at the DOE and is being carried on by the DOE and the NIH.
The technology of Expressed Sequence Tags (EST) was developed as one part of the Human Genome Project. EST technology isolates pieces of DNA from genes whose instructions are being actively interpreted. For various reasons this became an orphan technology that could not be conducted at or funded by the NIH. Human Genome Sciences took up this orphan technology, and after two years we believe we have now been able to isolate EST's from at least 95% of all human genes. This has been accomplished by means of robotics. The processes of picking colonies of cells from growth medium plates, growing those cells, isolating the EST's from their DNA and sequencing them have all been automated. We have a factory that produces information about the human body on an assembly line basis. Prior to our work 4,000 EST's had been isolated and sequenced. We have isolated 800,000 EST's and sequenced 400,000 of them. We can estimate that we have EST's from 95% of the human genes, because 95% of all known gene sequences can be found in an average of 4 of our EST samples, and each new gene reported can be found among our EST samples 95% of the time.
In answering some age-old questions we would now say that we are atoms. There is no material difference between animate and inanimate, except in the level of organization of the material and its energy. Having a complete collection of genes can give us a deeper appreciation of how closely related we are to other living organisms. We know that life began about 3 billion years ago and was relatively stable as single-cell and simple multicell forms until about 600 million years ago when sex appeared and evolution really took off.
|bacteria (Escherichia coli)||3,000|
|yeast (Saccharomyces cerevisiae)||6,000|
|worm (Caenorhabditis elegans)||12,000|
|fly (Drosophila melanogaster)||30,000|
|mammal (Homo sapiens)||100,000|
The 3,000 genes in bacteria probably represent the approximate minimum number of genes that would be required by a self-reproducing organism. The increasing numbers of genes beyond that appear to arise chiefly by replication and variation of the basic set.
In addition to enabling us to correct and overcome disease and to predict future health patterns and problems, these new genetics technologies will also permit gene therapy. Even more controversial, it will permit manipulation of the genetic heritage. The genetic future need no longer be a matter of chance.
The President thanked the speaker on behalf of the Society. The President presented the name of one new member. The President then announced the speaker for the next meeting, made the parking announcement, and adjourned the 2038th meeting at 9:56 p.m.
|John S. Garavelli|
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