The Yukon, July, 1991
Picture was taken at 10:00 p.m. Glad I bought that flashlight!
To understand what follows, you have to recall the meaning of
the following:
Cytoplasm: The goop in a cell outside the nucleus,
comprising all sorts of things including organelles called…
Mitochondria: Tiny, membrane-enclosed packages that
produce energy by the breakdown of sugars.
Contained within the mitochondria is a short strand of DNA, called miDNA.
I.V.F: In-vitro fertilization, wherein an egg is
extracted from a female, fertilized in a test tube, then re-implanted in the uterus.
Parents: Individuals who contribute DNA to a …..
Zygote: A single
omnipotent cell capable of transforming itself into a human being. (Or, if it is a goat zygote, into a
full-fledged goat You get the picture..)
Anyway, the article describes research aimed at (1) enhancing
fertility in women who have a hard time getting pregnant, and (2) curing some
very nasty diseases that occur when the mitochondria misbehave owing to mutated
miDNA. The fertilization part of the “experiment”
has been going on for a long time; fully healthy and highly functional children
have been the result (although several “failures” are noted.) The second
goal has been pursued for a shorter time & the jury seems still to be out.
What these guys do is something like this. They take a fertilized egg, extract the cytoplasm
(how, for God’s sake!), then replace it with cytoplasm extracted from the egg
of another woman. This, then, is
implanted in the proper place (I.V.F) and allowed to reach maturity. The result: should be a child whose cells contained the nuclear
DNA of her mother and father – and the miDNA of another woman.
Characteristics such as height, hair color, smarts, etc. would be the result
of DNA from the mother and father (plus environmental effects, of course), but
the little mitochondrial power plants would be inherited from a stranger. So?
Well, note that mitochondria are inherited exclusively from
the mother. Thus, the “stranger miDNA” conceivably
could echo down the corridors of time, “even to the nth generation.” Is that bad?
Well, hell, I couldn’t figure out what the problem actually
is. It seems to have a large
moral/philosophical dimension. The
article is long, and when I get the clothes washed I will read it again. In the meantime, enjoy!