Sunday, July 16, 2006
How man's best friend overcame laws of natural evolution
Sunday Times - Times: A geneticist says he may have solved the mystery of how 350 breeds of dog evolved from a single ancestor, the grey wolf.
Matthew Webster of the Smurfit Institute of Genetics at Trinity College, Dublin, and colleagues at Uppsala University, Sweden, say the domestication of dogs may be allowing them to override the natural laws governing evolution.
They suggest natural selection, which ensures the survival of the fittest and weeds out genetic mutations that don't provide a survival advantage, was relaxed when dogs became domesticated. Living with people allowed harmful genetic variations to flourish that would never have survived in the wild.
This interference with nature could also explain why domestic dogs developed an array of diseases such as cancer, heart disease and epilepsy.
"Dogs exhibit more variation in size, appearance and behaviour than any other mammal, but the source of this huge diversity is something of a mystery," said Webster. "Dogs were domesticated from wolves very recently, on an evolutionary timescale, so all the variability seen in different dog breeds today has been generated in a relatively short time."
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