Sep 14, 2017

Farming didn't erase genetic diversity in Papua New Guinea

Goroka village in the Eastern Highlands Province of Papua New Guinea. Photo: Papua New Guinea Institute of Medical Research

New genetic analysis of people living in Papua New Guinea shows a sharp genetic divide between 10,000 and 20,000 years ago that was likely determined by whether their ancestors lived a more nomadic life in the highlands or a more sedentary one in the lowlands.

Why it matters: The genetic divide began at about the same time people began farming in the lowlands. In other parts of the world during the Bronze and Iron Ages, migration and innovations were the prime forces that shaped human evolution. But that doesn't seem to be the case in Papua New Guinea, where the transition to cultivating crops had the opposite effect. Study author geneticist Chris Tyler-Smith told Science that "is a big surprise."

How they did it: Researchers analyzed the genetic makeup of 381 people from 85 different language groups across Papua New Guinea, and also analyzed 39 genome sequences that had been previously generated from people there.

What it means: The researchers say the findings may indicate technological advances in the Bronze Age — not earlier agricultural ones — may have wiped out genetic groups in Europe, per Science.

Go deeper

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 10 p.m. ET: 857,957 — Total deaths: 42,139 — Total recoveries: 178,091.
  2. U.S.: Leads the world in confirmed cases. Total confirmed cases as of 10 p.m. ET: 188,547 — Total deaths: 3,899 — Total recoveries: 7,068.
  3. Business updates: Should you pay your rent or mortgage during the coronavirus pandemic? Find out if you are protected under the CARES Act.
  4. Public health updates: More than 400 long-term care facilities across the U.S. report patients with coronavirus — Older adults and people with underlying health conditions are more at risk, new data shows.
  5. Federal government latest: President Trump said the next two weeks would be "very painful," with projections indicating the virus could kill 100,000–240,000 Americans.
  6. Coronavirus in custody: Inmates in all U.S. federal prisons are set to enter a 14-day quarantine on April 1. A federal judge on Tuesday ordered U.S. Immigration and Customs Enforcement to release 10 detained immigrants who are at risk of contracting COVID-19 while in confinement.
  7. U.S.S. Theodore Roosevelt: Captain of nuclear aircraft carrier docked in Guam pleaded with the U.S. Navy for more resources after more than 100 members of his crew tested positive.
  8. What should I do? Answers about the virus from Axios expertsWhat to know about social distancingQ&A: Minimizing your coronavirus risk.
  9. Other resources: CDC on how to avoid the virus, what to do if you get it.

Subscribe to Mike Allen's Axios AM to follow our coronavirus coverage each morning from your inbox.

World coronavirus updates: UN warns of recession with "no parallel" to recent past

Data: The Center for Systems Science and Engineering at Johns Hopkins, the CDC, and China's Health Ministry. Note: China numbers are for the mainland only and U.S. numbers include repatriated citizens and confirmed plus presumptive cases from the CDC

The novel coronavirus pandemic is the "greatest test" the world has faced together since the formation of the United Nations just after the Second World War ended in 1945, UN chief António Guterres said Tuesday.

The big picture: COVID-19 cases surged past 856,000 and the death toll exceeded 42,000 Tuesday, per Johns Hopkins data. Italy reported more than 12,000 deaths.

Go deeperArrowUpdated 2 hours ago - Health

White House projects 100,000 to 240,000 U.S. coronavirus deaths

President Trump said at a press briefing on Tuesday that the next two weeks in the U.S. will be "very painful" and that he wants "every American to be prepared for the days that lie ahead," before giving way to Deborah Birx to explain the models informing the White House's new guidance on the coronavirus.

Why it matters: It's a somber new tone from the president that comes after his medical advisers showed him data projecting that the virus could kill 100,000–240,000 Americans — even with strict social distancing guidelines in place.

Go deeperArrowUpdated 4 hours ago - Health