|
Originally aired February
6, 1998
Cloning
Holds Key to Bigger and Better
By
Correspondent Brad Penner, STATEWIDE Correspondent.
 [MC at Ceremony]"Tonight's presentation is titled
The Future of Cloning. Ladies and gentlemen, it is with great pleasure
that I introduce to you Dr. Ian Wilmut."
If you want to know about cloning, if you want to know about new frontiers
in biotechnology, Dr. Ian Wilmut is a good man to talk to. He was on
the team that cloned Dolly the Sheep. He knows what the word clone means.
[Dr. Ian Wilmut]
"So strictly what it means is a copy of an adult animal. So it's
still true to say that Dolly is the only clone.
Dolly, living proof
that what was once science fiction is now science fact. Her existence
has forced scientists and society to think about the possibilities."
[Dr. Wilmut] "You
might want to identify let's say a really good dairy cow which has very
high milk yield, good protein content, low incidence of mastitis, high
fertility. You would want to make a copy of an adult animal in that
case."
[Dr. Randall Prather]
"The application of these technologies is really limited by your
imagination. That's the limit. Potentially, we can do so many things
but your imagination is what's limiting us. "
Dr. Randall Prather
is another expert on biotechnology. He came to Nebraska Wesleyan University
for a seminar tied to Dr. Wilmut's speech. He is working on something
called the nuclei transfer process. It's a way to change the instructions
that tell a cell how to grow.
[Dr. Prather] "Initially
what we want to do is just show that it can work, and the next step
is to come in and specifically genetically modify those cells before
we do the nuclear transfers so that we can create an animal that has
the specific genetic modification we're after."
Eventually that
technology could make its way to the farm or ranch. Livestock producers
could pick the genetic characteristics they want their animals to have.
The result might be an animal that needs less feed to put on more weight,
and the meat from every animal in the herd would be the same quality.
[Dr. Prather] "I
think it will be a more uniform carcass. That's something the pig industry
has been striving for and has done a pretty good job at. Would still
like more uniformity. The cattle industry has a long way to go. We can
talk about uniformity of carcass. We can talk about feed efficiency,
the efficiency of producing food. I think both of them are attainable
goals."
For now cloning
techniques aren't advanced enough to make it a practical way to produce
livestock. But Dr. Wilmut foresees a time when cloned embryos can be
implanted using a technique similar to artificial insemination.
 [Dr. Wilmut] "It's a little bit more difficult but
the same technicians could certainly be trained to do it and no doubt
a farmer with a big group of cattle could learn to do it. Because the
tract at that time has to be handled even more gently, because it's
going to be the egg which lives in it directly as soon as it comes out
of the catheter.Yes, it's essentially the same technique." How
soon will this kind of technology be available on a commercial basis?
That's hard to tell.
[Dr. Wilmut] "It
could be 10 years. It could be 20 years. It really is very difficult.
I would suspect it's nearer to 10 than two or three. It's several years
into the future but you don't know. After all, Dolly took the whole
world by storm just over a year ago. What we are talking about is another
step of the same sort of order, a big increase in the effectiveness
of a method."
At the Meat Animal
Research Center near Clay Center, scientists are working on a different
method of changing the characteristics of cattle.
[Dr. Tim Smith]
"We don't alter their genetics in any way other than by selecting
who we want to breed with who. That's, of course, what everyone does
with their cattle worldwide."
These are the kinds of cattle Dr. Smith is working with. They're known
as Belgian Blues. They have a trait called double muscling. They are
bigger, meatier cattle, but that trait also makes it difficult for the
cows to give birth. Dr. Smith says that problem can be avoided if the
cattle have only one copy of the double muscling gene, something known
as a heterozygous condition for that gene.
 [Dr. Smith] "We are currently developing a test
that you can run and say this calf is carrying one copy normal, one
copy mutation. That allows you to make a production system that breeds
for the heterozygous condition." Some calves resulting from Dr. Smith's research are being studied
at the Meat Animal Research Center. They are, as he said, the result
of a mutation.
[Dr. Smith] "It
has a negative connotation to it. But in fact, everybody's accumulating
mutations all the time. That's why you're not exactly like your parents.
Things get shuffled around and these kinds of things happen. The difference
in cattle is people look at a cow or a bull that has larger muscles
and say, I like that bull, so you start selecting for that change. Some
changes are good and some changes are bad. In terms of raising cattle,
this one happened to be good. "
Smith uses natural
breeding techniques that have been used for years to develop breeds
with desirable characteristics. He says there may be reluctance to use
some of the new technology for animal production.
[Dr. Smith] "There
is some commercial interest, I know, in cloning complete animals just
because then you can get multiple copies of your prize bull. But there,
I think, is in general less interest in putting genes into cattle that
improve their carcass characteristics for consumption, and I think that's
because consumers are going to be somewhat wary of that. "
In fact, a survey
done for the International Food Information Council showed that reluctance.
It asked this question. On a scale of 1 to 5 where 1 is unacceptable
and 5 is acceptable, how acceptable do you find the cloning of animals
to make copies of food? Only 14% said it was acceptable. 54% said it
was unacceptable.  [Lisa Katic] "When you're speaking about science,
it's important to avoid absolutes."
Lisa Katic works for the International Food Information Council. She
says education is the only way to overcome consumer resistance."
[Lisa Katic] "Not
only do they not know about biotechnology, they don't know about agriculture.
It depends on where you come from in the country. People that come from
certain ppers of the country think that food comes from the supermarket.
That's their understanding and extent of their knowledge base on agriculture.
So, of course, if they don't understand that, they're not going to understand
and accept biotechnology. People have different ideas or visions about
what biotechnology is. "
If it becomes practical
to clone cattle or other animals, there will be questions about safety.
Is there potential that then the meat from that animal could somehow
have a side effect on the person who might consume it?
[Dr. Wilmut]"
I can't think how there could be. Certainly in the strict genetic copy,
I can't see that at all. If you were making a genetic change, which
is a different situation, again, assuming that you're changing the cow's
D.N.A., again I can't see any reason that it could."
But terms like
genetic engineering and cloning can for some conjure up images of mad
scientists in secret laboratories. For others it's simply an uncomfortable
feeling that science is going too far in creating something unnatural.
[Dr. Wilmut] "This
is a technique which has got a lot to contribute in medicine and in
research. It will help us to understand some genetic diseases like cystic
fibrosis, for example. I don't think we do create life. I think that's
sort of misleading. We have been using animals and plants in slightly
different ways for our own purposes for a long time. "
Gradually man learned
the secrets of selective breeding.
[Dr. Prather]"
In terms of altering genes, in terms of altering cells, we have been
doing that since animals were domesticated. Animals have been selected
for this or selected for that and that's modified the genes that are
present, modified the expression of those genes. This is just going
the next step and being able to do it much faster. "
 [Dr. Clifton Baile, U. of Georgia] "It is a way to have a more
rapid change, but these types of selections occurred forever and ever,
so it is a different way to apply genetics and you get a quicker response." [Dr. Prather] "If we look at
the potential impact that this can have in terms of feeding an evergrowing
world population, in terms of alleviating human suffering, I think a
lot of these experiments are very well justified. In fact, I think we're
irresponsible if we don't pursue them to feed the world and to alleviate
human suffering."
In the coming months
and years, pigs may be altered so that their organs can be used for
human transplants. Cows will be used as living factories producing lifesaving
medicine in their milk. And perhaps a herd of cloned cattle will roam
the Nebraska Sandhills.
Captioning
by Nebraska Captioning Center, Lincoln, Nebraska.
|