Evolution Solved? Family walks on all fours

[Guest Arnold_OldSchool]

 

Family may provide evolution clue

Five siblings from Turkey who walk on all fours could provide science with an insight into human evolution, researchers have said.

The four sisters and one brother could yield clues to why our ancestors made the transition from four-legged to two-legged animals, says a UK expert.

 

But Professor Nicholas Humphrey rejects the idea that there is a "gene" for bipedalism, or upright walking.

 

A BBC documentary about the family will be shown on Friday 17 March.

 

Professor Humphrey, from the London School of Economics (LSE), says that our own species' transition to walking on two feet must have been a more complex process that involved many changes to the skeleton and to the human genetic make-up.

 

However, a German group says a genetic abnormality does seem to be involved in the siblings' gait.

 

Coordination problem

 

Three of the sisters and one brother have only ever walked on two hands and two feet, but another sister alternates between a bipedal and quadrupedal gait. Another brother walks on two feet all the time, but only with difficulty.

 

 

The siblings live with their parents and five other brothers and sisters. They were born with what looks like a form of brain damage.

MRI scans seem to show that they have a form of cerebellar ataxia, which affects balance and coordination.

 

However, scientists are divided on what caused them to revert to quadrupedalism (walking on all fours).

 

The method of locomotion used by the Turkish children and by our closest relatives chimpanzees and gorillas, differs in a crucial way, said Professor Humphrey.

 

While gorillas and chimpanzees walk on their knuckles, the Turkish siblings put their weight on the wrists, lifting their fingers off the ground.

 

Tool use

 

"What's significant about that is that chimpanzees ruin their fingers walking like that," Professor Humphrey, an evolutionary psychologist, told the BBC News website.

 

 

"These kids have kept their fingers very agile, for example, the girls in the family can do crochet and embroidery."

He added that calluses pictured on the hands of one family member demonstrated that the behaviour was not a hoax.

 

Professor Humphrey said this could be the way that humankind's direct ancestors walked.

 

Hands which have kept the fingers dextrous would also have been able to manipulate tools, a key development which influenced the evolution of the human body and intelligence.

 

"I think it's possible that what we are seeing in this family is something that does correspond to a time when we didn't walk like chimpanzees but was an important step between coming down from the trees and becoming fully bipedal," the LSE researcher said.

 

'Infant walking'

 

Professor Humphrey thinks that the brain abnormality simply caused the siblings to rediscover a form of locomotion used by our ancestors.

 

"Because of the peculiar circumstances they were in, they kept walking as infants," he said.

 

But a team led by Stefan Mundlos of the Max Planck Institute in Berlin, Germany, thinks that the genetic abnormality which causes the children's unusual gait may have played a more fundamental role in evolution.

 

Professor Mundlos has located the gene on chromosome 17 and speculates that a gene important in the transition to bipedalism may have been knocked out in the children.

 

Producer on the documentary Jemima Harrison said the programme's producers were moved by the family's "tremendous warmth and humanity".

 

BBC Two's The Family That Walks On All Fours is broadcast on Friday 17 March at 2100 GMT

 

Story from BBC NEWS:

[k thx 0]

They're just doing it for attention.

[Slayer 0]

Face down, ass up...

[k thx 0]

If they were fit, I'd watch that show.

[The Czech Republic 0]

Oh man, if they were Africans and not Turks, we'd never hear the end of it

[Ravenbomb 0]

man, that'd freak me the fuck out if I saw one o' thems coming up to me.

[Krankor 0]

I wonder if the run like silverback gorillas.

I don't think it has anything to do with some link to the past. They have brain damage, which causes them to not have good balance. So they adapted to moving on all fours otherwise they wouldn't be able to move at all.

[nl5xsk1 0]

Yeah, so they're retarded and walk like primates. But it's not all bad for them.

 

They saved a bunch of money on their car insurance by switching to Geico.

[daileyxplanet 0]

man, that'd freak me the fuck out if I saw one o' thems coming up to me.

 

Looks better than The Hills Have Eyes...

[nl5xsk1 0]

I think the new Hills Have Eyes looks good.

 

And the crab-walking retarded Turks would be more reminiscent of that "new" scene in the Exorscist Redux, when Reagan crab-walks down the stairs. If you were going to do a horror movie analogy, shoulda stayed with the Exorcist series.