How a Key Enzyme Repairs Sun-Damaged DNA

BraveHeart writes "Researchers have long known that mammals, including humans, lack a key enzyme — one possessed by most of the animal kingdom and even plants — that reverses severe sun damage. For the first time, researchers have witnessed how this enzyme works at the atomic level to repair sun-damaged DNA. 'Normal sunscreen lotions convert UV light to heat, or reflect it away from our skin. A sunscreen containing photolyase could potentially heal some of the damage from UV rays that get through.'"

Comments

Other DNA damage?

[kombipom]

Any reason why this couldn't be used to repair damage from other forms of radiation or carcinogens?

Re:It is not that straightforward

[GospelHead821]

Cancer is a disease that affects organisms late in life. Generally speaking, they will have already had an opportunity to reproduce by the time that they develop cancer. The introduction of this mutation could have been completely coincidental and it would not have affected the reproductive fitness of the organisms that had it. You might suggest that damage to DNA has consequences besides cancer but it actually doesn't, really. If a cell's DNA becomes too corrupt but the cell doesn't become cancerous as a result, just that one cell is likely to die. You're constantly making new skin cells anyway.