Showing posts with label genetics. Show all posts
Showing posts with label genetics. Show all posts

Monday, May 14, 2007

Down Syndrome Babies: An Endangered Species?

Recent developments in genetic testing are revolutionizing the ability to test for a variety of genetic disorders in unborn babies. Before now, this required a difficult, painful, and potentially hazardous procedure called amniocentesis, ususally reserved for expectant mothers over the age of 35. Amniocentesis itself carries a 0.5% miscarriage rate, but it has been used to diagnose such conditions as Down Syndrome, Tay-Sachs Disease, Sickle Cell Anemia, or Duchenne Muscular Dystrophy.

Now there is a simple blood test, recommended for all pregnancies, that reduces the risk for moms, but may dramatically increase the number of genetic disorders diagnosed prenatally. If past history is any guide, this means that 90% of women whio are told their baby has Down Syndrome will choose to have an abortion (reference).

What will be the results of such selection? Well, for one thing, fewer babies with diabilities - and this has many parents who advocate for them rather worried:
A dwindling Down Syndrome population, which now stands at about 350,000, could mean less institutional support and reduced funds for medical research. It could also mean a lonelier world for those who remain (NY Times).
Parent advocates are worried that doctors don't know how to handle the genetic information they now so easily obtain with two blood tests and a sonogram. Many physicians agree -- the best way to share a genetic diagnosis is not: "Your baby is going to be mentally retarded, you should have a pregnancy termination."

This does not mean that the future will be easy for parents who decide to carry their diabled child. But parents of the disabled see the new form of testing as one more step towards a society that doesn't welcome any imperfections. Commentator George F. Will called it a "search and destroy mission" for the handicapped (Will has a grown son, Jon, with Down Syndrome). In complaining about the new recommendations, he adds:
What did Jon Will and the more than 350,000 American citizens like him do to tick off the American College of Obstetricians and Gynecologists? It seems to want to help eliminate from America almost all of a category of citizens, a category that includes Jon (Newsweek).
Imagine a society where every one of us is genetically perfect, where none of us must strive for the small, daily steps of success that mark our physical, emotiojnal, and mental growth. I, for one, would not want to live there.

New York Times Article

Saturday, January 06, 2007

The Language of God

I have always thought that Dr. Francis Collins is a pretty cool guy. When I first met him in 1992, I was impressed by his engaging personality, his love of playing the guitar and riding motorcycles, and his unabashed Christian faith.

Dr. Collins is the head of the National Human Genome Research Institute, and directs the Human Genome Project, the $3 billion project to define the DNA sequence of human beings. The first 'rough draft' was completed in June, 2000, with the essentially complete sequence revealed in April, 2003.

A geneticist and physician, but also an evangelical Christian, Dr. Collins uses these various perspectives to harmonize science and faith in his best-selling book, The Language of God: A Scientist Presents Evidence for Belief (Free Press). He refers to the genetic code as "God's Instruction Book," and attests to the creativity and beauty inherent in this most basic blueprint of our biological nature.

After sharing his personal journey into faith, Collins makes a compelling case for his committment to theistic evolution. He criticizes Young-Earth Creationism (YEC) for "ignoring" clear scientific evidence for evolution, and takes Intelligent Design to task for not being "scientific enough."

Now I do not agree with Francis Collins here. I think he is much too hard on YEC, and too dismissive of Intelligent Design. It seems reasonable that our Creator would allow us to see the evidence of His handiwork in the creation around us.

Yet I appreciate Collins' love of God, and his willingness to see that human beings are more than their genes:

[The] DNA sequence alone . . . will never explain certain special human attributes, such as the knowledge of the Moral Law and the universal search for God (p. 140).
This common knowledge of God's Moral Law is why we have such broad agreement on ethical basics across many cultures and worldviews. And the yearning after God can never be ascribed to natural selection and the survival of the fittest.

So read The Language of God with thoughtful care. Despite my disagreements with his evolutionary viewpoint, Francis Collins demonstrates that science and faith are not incompatible. I would be glad to have coffee with him and talk about the things of the Lord. Maybe sometime he'll even give me a ride on his motorcycle.

Wednesday, November 22, 2006

DNA as Destiny?

Since the completion of the Human Genome Project, there seems to be a growing sense that everything, including our behavior, can be explained by our genes. According to this idea, there's a gene (or genes) for addiction, for sexual orientation, even for altruism. Now that we know the human genetic code, we can understand everything about our nature.

Recent work in epigenetics is undermining such determinism. Epigenetics is the study of those influences that act “over and above” genetics. For example, one study showed certain genetic mutations that normally lead to obesity in rats can be turned off by a modification in diet. The same amounts of food were given, but expression of the abnormal gene was blocked by changing the type of food.

In another study performed in mice, more intimate behavior of mothers towards their offspring led to increases in the size of the hippocampal region of the brain, a change that would normally have been ascribed to genetics alone.

The point is that DNA is not destiny. In the words of one writer, “Free will is not only real; to a yet undetermined extent, it can override DNA.” The implications for ethics and behavior are obvious. In contrast to the reductionism of secular science, free will is not an illusion, and our choices matter.

Original article: http://www.tothesource.org/11_22_2006/11_22_2006.htm