Saturday , July 2 2022

Researchers who study how dogs go to America | State and Territory


URBANA – Your poodle may have a French pedigree, but Siberia played an important role in putting the United States in dogs.

This is part of the research conducted at the University of Illinois and the Illinois State Archaeological Survey, based on the dog remains. Including two dogs buried back in the Illinois area, just across the Mississippi River from St. Louis.

According to News-Gazette news, the loving, ceremonial burial and 50 fossilized dogs tell the story.

This genetic code is not only about dogs, but about people who crossed a land bridge that once existed between Siberia and Alaska, and is a professor at the School of Integrative Biology, Ripan Malhi.

The Illinois State Archaeological Survey had found a few places with dogs.

Malhi's team, unwilling to destroy valuable scientific and cultural ruins, took samples of nearly 10,000 year old domestic dogs, probably the oldest in America.

"The amount removed is related to the size of a (tooth) cavity," he said.

Malhi followed the maternal line of dogs with Kelsey Witt Dillon, who conducted the mitochondrial DNA genome study, where she worked as a graduate student. (He is currently a post-doctoral researcher at California-Merced University.)

In a clean room – no sign of a pollutant – the researchers took out the DNA. It was then sequenced in another laboratory to create a "genomic library".

"DNA will give us millions of DNA lice," Malhi said, some of them long ago contaminated with microbes or even human intervention.

Malhi, who said that the first dogs in the United States came from Siberia, disappeared after the European contact, and the contact with the Indians and the population decreased.

It was found that the sea levels were lower in the Ice Age (lasting until about 14,500 years ago), and that the area between Siberia and eastern Alaska today is the land rather than the Bering Strait we know today. Witt Dillon, this region is known as "Beringia" and the people (and dogs) were able to cross the land bridge due to this lower sea level.

Scientists discuss how domestic dogs generally fall from the gene pool: Our ancestors may have killed them to prevent them from growing together with the dogs they had raised to hunt and drive, or be defeated at times of scarcity.

The disease is the most common cause, because it happened to the same Native Americans.

In the "Science" magazine, the researchers argued that the first dogs in the United States were not domesticated North American wolves.

They probably wrote, dogs watched companion people on a land bridge that once connected North Asia to America via Siberia.

Other researchers found dogs with traces on their shoulders at an archaeological site called Janey B. Goode, near Cahokia.

Malhi said that the signs could mean that dogs are not just our best friends, but our colleagues are like helping their hand in other ways, similar to their continued use with skids in the Northeast.

His expertise traces the history of genetics, so his articles have titles such as "The Distribution of Y chromosomes of Indigenous North Americans: A study of the Athapaskan population history".

He has worked closely with the peoples of the First Nations in British Columbia and Alaska, including the salmon, which is an invaluable source of food.

Nuclear DNA and mitochondrial DNA tell stories in different ways.

Witt Dillon, Nuclear DNA's "probably the type of DNA that most people think of – 23 pairs of your chromosomes nuclear DNA, and half of them from your mother and half of them inherited from your father."

"Your mitochondrial DNA is inherited from your mother, neden she said, and ok it's easier to find in older DNA samples that are often fragmented and fragmented, so there's more copies per cell than your nuclear DNA."

There is the question of when and where dogs are domesticated.

"Dogs were probably domesticated somewhere in Europe or Asia, from 15,000 to 21,000 years ago," Witt Dillon said. Said. "Europe, the Middle East, Southeast Asia, and Central Asia have all been suggested as dogs, but we don't have a clear answer yet."

Probably appeared in the "birth" place of several dogs.

By the way, is that poop that ends every dog? A pain to you, but a great value to science as fossilized coprolites.

Uarth graduate anthropology student Karthik Yarlagadda looks at the microbiology of the coproliths working with finance.

In modern studies, he knows that the samples tested must contain a large number of germs that reflect a number of factors, including the host's genetics, diet, and environment.

"Since the coprolites represent an old stool sample, they probably contain some residual DNA from the germs that live in the dogs. This is particularly interesting, because ancient microbiomas give us more insight into the individual's life story," Yarlagadda said.

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