Anubis wrote:
Exactly.
Telomeres act as buffers at the ends of chromosomes, basically junk DNA which codes for nothing, and a small chunk of telomere DNA is lost during Mitosis. When there is too little of the telomere left, the DNA is no longer replicated, as loss beyond the telomere may cause cancer. That's when aging starts to occur.
I know telomeres act as a buffer, as well as an aging yardstick. But it is also a quirk of the enzymes involved in DNA replication that some DNA is mismatched at the end. The telomeres are a protection against that. It is in fact too much telomeres (via too much telomerase) that is an indication of cancer. The actual cause of cancer is the overactivation of growth genes, and the suppression of genes that are supposed to either stop replication, or signal cell apoptosis due to damage.
Nice. Don't mutations and gene damage also cause cancer, though?