Rare disorder causes 5 siblings to walk on all fours

Some people walk on all fours for fun, or for sport, but not for long stretches and certainly not for ease of mobility. Yet five siblings in a family of 19 in Hatay, Turkey, walk not just primarily but only on all fours, and lack the balance to do otherwise.tially devolve.

Since the siblings were first discovered by scientists in 2005—and featured in a BBC documentary in 2006—one popular explanation of their unusual quadrupedal gait was "reverse evolution."

But new research suggests that theory is false, and that the condition is instead an adaptation to a rare disorder.

While 14 of the Ulas family siblings are fine, five have Uner Tan Syndrome, named after the Turkish evolutionary biologist who first studied them; they suffer from reduced balance and cognition.

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