In other words, some cells age faster than others.
Horvath notes that while most biological samples matched their chronological age, some diverged significantly. The average human heart, for example, appears to be 12 years younger than its chronological age, and a woman’s healthy breast tissue ages faster than the rest of her body.
“So it is possible that the cancer that is adjacent to this tissue accelerates the age," he said. "Having said this, I had one data set that was composed of truly healthy breast tissue and even there I observed a significant age acceleration.”
The results may explain why breast cancer is the most common cancer in women.
Remarkably, Horvath says the clock kept reliable time across the human anatomy, irrespective of where the DNA came from.
“This new epigenetic clock really frees us up from focusing on one tissue at a time because it really works in most tissues and organs and cell types, and the great advantage is that we now can compare the ages of different tissues and organs from the same individual,” he said.
Horvath says the work holds promise for studying human development, aging and disease, but also shows potential for rejuvenating tissues.
"Of course it has been a long-standing hope to find therapies or compounds that keep us young, and if this epigenetic clock measures a process that causes aging, then we will have a tool that allows us to evaluate compounds that keep us young,” he said
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2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25