Scientists Link Housecats to Wildcat Subspecies
By NICHOLAS WADE
NY TIMES, June 28 2007
Some 10,000 years ago, somewhere in the Near East, an audacious wild cat crept into one of the crude villages of early human settlers, the first to domesticate wheat and barley. There she felt safe from her many predators in the region, such as hyenas and larger cats, and the rodents that infested the settlers’ homes and granaries were sufficient prey for her.
Seeing she was earning her keep, the settlers tolerated her, and their children greeted her kittens with delight.
At least five females, of the wildcat subspecies known as Felis silvestris lybica, accomplished this delicate transition from forest to village, scientists have concluded, based on new DNA research. And from these five matriarchs, all the world’s 600 million housecats are descended.
Carlos A. Driscoll of the National Cancer Institute and colleagues spent more than six years collecting species of wildcat from Scotland to Israel. He then analyzed the DNA of the wildcats, of many ordinary house cats and of the fancy cats that breeders started to develop in the 19th century.
Five subspecies of wildcat spread across the Old World. They are known as the European wildcat, the Near Eastern wildcat, the Southern African wildcat, the Central Asian wildcat and the Chinese desert cat. Their patterns of DNA fall into 5 clusters. The DNA of all house cats and fancy cats falls within the Near Eastern wildcat cluster, making clear that this subspecies is their ancestor, Dr. Driscoll and his colleagues report in today’s issue of Science.
The wildcat DNA closest to that of modern house cats came from 15 individuals collected in the remote deserts of Israel, the United Arab Emirates, Bahrain and Saudi Arabia, the researchers say.
The house cats in the study fell into five lineages, based on analysis of their mitochondrial DNA, which is passed down solely through the female line. Since the oldest known archaeological site with a cat burial is about 9,500 years old, the geneticists suggest that the founders of the five lineages lived around this time and were the first cats to be domesticated.
Wheat, rye and barley had been domesticated in the Near East by 10,000 years ago, so it seems likely that the granaries of early Neolithic villages harbored mice and rats, and that the settlers would have welcomed the cats’ help in controlling them.
Unlike other domestic animals, which were tamed by people, cats probably domesticated themselves, perhaps accounting for the haughty independence of their descendants. “The cats were adapting themselves to a new environment, so the push for domestication came from the cat side, not the human side,” Dr. Driscoll said.
Cats are “indicators of human cultural adolescence,” he remarked, since they entered human experience as people were making the difficult transition from hunting and gathering, their way of life for millions of years, to settled communities.
Until recently the cat was commonly believed to have been domesticated in ancient Egypt, where it was a cult animal. But three years ago a group of French archaeologists led by Jean-Denis Vigne discovered the remains of an eight-month-old cat buried with what was presumably its human owner at a Neolithic site in Cyprus. The Mediterranean island was settled by farmers from Turkey who brought their domesticated animals with them, presumably including cats, because there is no evidence of native wildcats in Cyprus.
The date of the burial, some 9,500 years ago, far precedes Egyptian civilization. Together with the new genetic evidence, it places the domestication of the cat in a different context, the beginnings of agriculture in the Near East, and probably in the villages of the Fertile Crescent, the belt of land that stretches up through the countries of the eastern Mediterranean and down through what is now Iraq.
Dr. Stephen O’Brien, an expert on the genetics of the cat family and a co-author of the Science report, described the domestication of the cat as “the beginning of one of the major experiments in biological history,” because the number of house cats in the world now exceeds half a billion, while most of the 36 other species of cat, and many wildcats, are now threatened with extinction.
So a valuable outcome of the new study is the discovery of genetic markers in the DNA that distinguish native wildcats from the house cats and feral domestic cats with which they often interbreed. In Britain and other countries, true wildcats may be highly protected by law but stray cats are not.
David Macdonald of Oxford University in England, a co-author of the report, has spent 10 years trying to preserve the Scottish wildcat, of which only 400 or so remain. “We can use some of the genetic markers to talk to conservation agencies like the Scottish Natural Heritage,” he said.
NY TIMES, June 28 2007
Some 10,000 years ago, somewhere in the Near East, an audacious wild cat crept into one of the crude villages of early human settlers, the first to domesticate wheat and barley. There she felt safe from her many predators in the region, such as hyenas and larger cats, and the rodents that infested the settlers’ homes and granaries were sufficient prey for her.
Seeing she was earning her keep, the settlers tolerated her, and their children greeted her kittens with delight.
At least five females, of the wildcat subspecies known as Felis silvestris lybica, accomplished this delicate transition from forest to village, scientists have concluded, based on new DNA research. And from these five matriarchs, all the world’s 600 million housecats are descended.
Carlos A. Driscoll of the National Cancer Institute and colleagues spent more than six years collecting species of wildcat from Scotland to Israel. He then analyzed the DNA of the wildcats, of many ordinary house cats and of the fancy cats that breeders started to develop in the 19th century.
Five subspecies of wildcat spread across the Old World. They are known as the European wildcat, the Near Eastern wildcat, the Southern African wildcat, the Central Asian wildcat and the Chinese desert cat. Their patterns of DNA fall into 5 clusters. The DNA of all house cats and fancy cats falls within the Near Eastern wildcat cluster, making clear that this subspecies is their ancestor, Dr. Driscoll and his colleagues report in today’s issue of Science.
The wildcat DNA closest to that of modern house cats came from 15 individuals collected in the remote deserts of Israel, the United Arab Emirates, Bahrain and Saudi Arabia, the researchers say.
The house cats in the study fell into five lineages, based on analysis of their mitochondrial DNA, which is passed down solely through the female line. Since the oldest known archaeological site with a cat burial is about 9,500 years old, the geneticists suggest that the founders of the five lineages lived around this time and were the first cats to be domesticated.
Wheat, rye and barley had been domesticated in the Near East by 10,000 years ago, so it seems likely that the granaries of early Neolithic villages harbored mice and rats, and that the settlers would have welcomed the cats’ help in controlling them.
Unlike other domestic animals, which were tamed by people, cats probably domesticated themselves, perhaps accounting for the haughty independence of their descendants. “The cats were adapting themselves to a new environment, so the push for domestication came from the cat side, not the human side,” Dr. Driscoll said.
Cats are “indicators of human cultural adolescence,” he remarked, since they entered human experience as people were making the difficult transition from hunting and gathering, their way of life for millions of years, to settled communities.
Until recently the cat was commonly believed to have been domesticated in ancient Egypt, where it was a cult animal. But three years ago a group of French archaeologists led by Jean-Denis Vigne discovered the remains of an eight-month-old cat buried with what was presumably its human owner at a Neolithic site in Cyprus. The Mediterranean island was settled by farmers from Turkey who brought their domesticated animals with them, presumably including cats, because there is no evidence of native wildcats in Cyprus.
The date of the burial, some 9,500 years ago, far precedes Egyptian civilization. Together with the new genetic evidence, it places the domestication of the cat in a different context, the beginnings of agriculture in the Near East, and probably in the villages of the Fertile Crescent, the belt of land that stretches up through the countries of the eastern Mediterranean and down through what is now Iraq.
Dr. Stephen O’Brien, an expert on the genetics of the cat family and a co-author of the Science report, described the domestication of the cat as “the beginning of one of the major experiments in biological history,” because the number of house cats in the world now exceeds half a billion, while most of the 36 other species of cat, and many wildcats, are now threatened with extinction.
So a valuable outcome of the new study is the discovery of genetic markers in the DNA that distinguish native wildcats from the house cats and feral domestic cats with which they often interbreed. In Britain and other countries, true wildcats may be highly protected by law but stray cats are not.
David Macdonald of Oxford University in England, a co-author of the report, has spent 10 years trying to preserve the Scottish wildcat, of which only 400 or so remain. “We can use some of the genetic markers to talk to conservation agencies like the Scottish Natural Heritage,” he said.
posted by huZmid at 3:56 PM
0 Comments:
Post a Comment
<< Home