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DNA study suggests human immunity to disease has ethnicity basis
by Staff Writers
Burnaby, British Columbia (UPI) Apr 19, 2013

Evidence shows humans living around Stonehenge earlier than thought
London (UPI) Apr 19, 2013 - Archaeologists say new discoveries suggest the area around England's Stonehenge was occupied 5,000 years earlier than previously thought.

A research dig at a location just a mile from the ancient iconic stone structure has unearthed the first firm evidence of continuous occupation from as early as 7,500 B.C., they said.

That goes against previously help beliefs that the Stonehenge site was abandoned by Mesolithic humans and occupied by Neolithic men thousands of years later.

Rather, they researchers said, Stonehenge should be considered a place where one culture merged with the other.

Researchers said the settlement was identified after it was decided to search around a spring on the site, under the assumption it could have attracted animals.

"My thinking was where you find wild animals, you tend to find people," study leader David Jacques of the Open University told The Daily Telegraph. "What we found was the nearest secure watering hole for animals and people, a type of all year round fresh water source. It's the nearest one to this place [Stonehenge]. I think it's pivotal."

The people occupying the site were most likely responsible for erecting the first monument at Stonehenge, known as the Mesolithic posts, between the 9th and 7th millennia B.C., the archaeologists said.

Immunity to disease may vary depending on ethnicity so designing treatments that will work for everybody may be impossible, U.S. and Canadian researchers say.

DNA sequencing suggests human antibody genes and how well they operate -- and what they can fight off -- can vary from person to person, and ethnicity may influence immunity, a release from Simon Fraser University in British Columbia reported.

The researchers say the finding is based on sequencing the immensely repetitive DNA in the human genome's 1 million nucleotide-long immunoglobulin heavy (IGH)-chain locus -- long known as the most prolific producer of the 50-plus varied and diverse antibody-encoding genes that cells use to fight off infections and diseases.

"Time will confirm the extent to which this is true. But we've found that sections of the IGH-chain locus' DNA sequence are either missing or inserted into a person's genome, and this could vary depending on ethnicity," Corey Watson, a postdoctoral researcher at the Mount Sinai School of Medicine in New York, said.

That may affect the effectiveness of drugs, treatments and vaccinations usually designed to treat whole populations. The researchers said the link between antibody makeup and ethnicity surfaced when they screened the chromosomes of 425 people of Asian, African and European descent for several DNA insertions and deletions.

The findings "could mean that past environmental exposures to certain pathogens caused DNA insertions or deletions in different ethnic groups, which could impact disease risk," Watson said. "Our results demonstrate that antibody studies need to take into account the ethnicity of DNA samples used."


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