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New
strategy behind drug development ZymoGenetics
is among the leaders in the race to unravel the functions of human genes.
The classical approach to medical research is to first find a therapeutic area then to
initiate the search for active substances.
At ZymoGenetics - Novo Nordisk's US Health Care discovery centre in Seattle - they have
taken a different approach. Here the aim is to determine the function of human genes whose
identification is currently progressing so fast. In simple terms, certain genes code for
certain proteins. And certain proteins can be used as drugs. So unlike the classical
approach to medical research, you only identify what therapeutic areas a drug may be
useful in once you have discovered the function of a particular gene.
The ZymoGenetics approach functions as a supplement to the more traditional methods that
are still vital to the continued development of new products and therapies at Novo
Nordisk's research centres both in Denmark and in other countries.
"The human genome will be identified within four or five years. So we have turned our
research strategy completely around and are concentrating on finding the function of those
genes that have been identified," says Claus Kühl, president of ZymoGenetics.
ZymoGenetics receives a continuous stream of data from Incyte Pharmaceuticals, Sequana and
Lark, companies specialising in collecting, selling or generating genetic data.
ZymoGenetics is one of the relatively few companies in the world with access to these
data.
Identifying genes is progressing much more rapidly than discovering their ultimate
biological or therapeutic functions. Even though every human gene will be identified
within a short span of years, it may take ten years before scientists have discovered
precisely what they do.
"The competition is fierce, but we are among the leading companies in the world doing
just that. Simply because we adopted this strategy at a very early stage and because our
research team has put together the right combination of scientific disciplines, including
molecular biologists, bioinformaticians, biochemists, and biologists," says Kühl.
ZymoGenetics' research strategy means that they conduct research that can lead to the
discovery of new drugs that lie outside Novo Nordisk's three core areas in Health Care -
Diabetes Care, Women's Health Care and Growth Disorders.
"If we come across genes or proteins that can be used in the treatment of cancer, for
example, we can either develop and market the drugs ourselves or swap our findings with
another pharmaceutical company that may have found a gene that could be of vital
importance to the treatment of diabetes," explains Kühl.

Claus Kühl: The identification of the human genome is
going to be an important tool in the development of new medicines. |
From genes to medicine
It is estimated that the human genome consists of between 100,000 to 120,000
genes, controlling every biological function from the structure of a cell to the body's
production of hormones. Of these tens of thousands of genes, there are perhaps only a few
hundred that are involved in biological control mechanisms and which would be of medical
importance. But knowledge of the functions of these few hundred will potentially
revolutionise all medical treatment as we know it today.
The reason the identification process is going so fast is that researchers discovered some
years ago that it was not necessary to map the entire collection of human DNA from one end
to the other to locate the genes.
Once the sequence of a small portion of a gene is known, that short sequence is often
enough to identify the entire gene and reveal where it came from in the human genome. The
quantities of data are enormous. So based on prior knowledge of gene sequences and their
functions, you can make computer simulations of how the individual genetic product can be
expected to look and behave. Those genes that look promising are described and presented
to a scientific evaluation group that takes the decision of whether the gene sequence is
worthy of further laboratory examination. Here the gene is cloned along its full length,
after which it is introduced into a microorganism or cell, which, as a result, starts
producing the protein the gene codes for. The protein is purified and its function
analysed by various biological tests. If its function is important, a patent application
will be filed to stay ahead of the competition.
Patents essential
Medicines based on proteins generally have much better patent protection and thus
exclusivity in the market. In contrast, medicines based on small molecules have
experienced increasing and very fierce competition because effective patent protection is
far more difficult to achieve.
| Exclusivity is becoming shorter |
| Drug |
Use |
First
year |
Years of exclusivity |
Inderal®
Tagamet®
Capoten®
Seldane®
Retrovir®
Mevacor®
Prozac®
Cozaar®
Risperdal®
Diflucan®
Zofran®
Invirase® |
Angina®
Antiulcer
Antihypertensive
Allergies
AIDS
Elevated lipids
Antidepressant
Antihypertensive
Antipsychotic
Antifungal
Antinausea
AIDS |
1968
1977
1980
1985
1987
1987
1988
1996
1994
1990
1991
1995 |
10
6
5
4
4
4
4
2
2
2
1
1/4 |
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| Patent protection of new
pharmaceutical products is becoming shorter and shorter. As a consequence, the ability to
launch new products faster becomes increasingly important in the years to come. |
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A patent is essential for further development
of a therapeutic agent. Without a patent, it makes no commercial sense to invest in
clinical trials and all the procedures necessary to get a new drug approved. Costs for
development and testing of a new drug typically run into several billion DKK and if this
investment is not protected by a patent, keeping competing companies out for a certain
period of time, it would be impossible ever to recover the costs of developing a new drug.
You can obtain a patent covering an isolated gene or a protein, as well as a
pharmaceutical product to treat or prevent diseases or conditions. |