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Jun 12, 2012

Your DNA Changes as You Age

While our bodies age, scientists believe that our DNA at least remains constant. New research, however, reveals that, even though its sequence remains constant, subtle chemical changes occur to our DNA as we age—and it could explain why the risk of developing disease increases as we get older.

DNA is made up of four basic chemical building blocks, called adenine, thymine, guanine, and cytosine. It's the sequences of those chemicals in a strand of DNA that determines what function a gene has, and one of the ways the resulting genes are controlled is a process called methylation. That just means that a methyl group — one carbon atom and three hydrogen atom—bonds to part of the DNA and subtly change its function.

New research, published in PNAS, however, shows that as we grow older our DNA's susceptibility to methylation changes. A team of researchers from the Bellvitge Biomedical Research Institute in Barcelona, Spain, extracted DNA from white blood cells of twenty newborn babies and twenty people aged between 89 and 100 years old, then compared their respective degrees of methylation.

In a newborn baby 73 percent of cytosine nucleotides were methylated, while in centenarians that figure rose to 80.5 percent. An intermediary example, taken from a 26-year-old male subject, exhibited 78 percent methylation. It's not clear why it happens, but the researchers speculate that it could be due to extremely subtle age-related changes to the DNA.

But what does it all mean? Well, taking a closer look at the samples, the researchers discovered that a third of the methylated groups which were different in the elderly compared to the young are already known to be linked to cancer risk.

If you think about the DNA strand as "hardware" and the added methyl groups as "software"—which isn't actually a bad analogy—you can think of the inappropriately placed methyl groups as software bugs that accumulate with age. It's just that, for humans, those bugs leads to increased risk of terminal disease. Fortunately, these kinds of findings should help scientists troubleshoot our internal apps. More here.

6 comments:

YeamieWaffles said...

Thanks for sharing this man, it's a little weird but certainly interesting.

Matt said...

Thats interesting, never knew.

G said...

interesting stuff...there is so much we don't understand about DNA

Jack said...

I had seen a documentary on this years ago. I know my DNA is a whole hell of a lot better than it was a few years ago.

Atley said...

man, we are now one more step closer to the fountain of youth!

Styn said...

hmm, good to know. Wanna be Immortal anyway!