Dying before Their Time | Science News

SUPPORT SCIENCE NEWS

Science News is a nonprofit.

Help us keep you informed.


Feature

Dying before Their Time

Studies of prematurely old mice hint that DNA mutations underlie aging

By
12:29pm, July 6, 2004

With one look, you can usually tell whether someone is old or young. Wrinkled skin or smooth. Thinning hair or thick locks. Bifocals or Ray-Bans. These are just a few of the overt clues. Far less obvious are the age-related signs that show up on the molecular level. Ask a geneticist where to look and he may point you to a person's mitochondria. These rod-shaped residents of an animal cell provide the cell with energy, and each mitochondrion has its own DNA strand, which is distinct from the DNA in the chromosomes that dwell in the cell's nucleus. With age, this mitochondrial DNA (mtDNA) becomes riddled with mutations, both subtle and severe.

This article is only available to Science News subscribers. Already a subscriber? Log in now. Or subscribe today for full access.

Get Science News headlines by e-mail.

More from this issue of Science News

[title_1]
From the Nature Index Paid Content