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Autism Spectrum Disorders Health Center

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Minority Kids With Autism and Trouble With Walking

Phenomenon occurs twice as often in black children, 1.5 times more in Hispanics than in whites: study

WebMD News from HealthDay

By Amy Norton

HealthDay Reporter

TUESDAY, May 6, 2014 (HealthDay News) -- Minority children with autism are more likely to have lost critical developmental skills, such as walking or talking, than are white children, according to a new study.

The phenomenon, called developmental regression, occurs when children have reached milestones such as saying words and walking, and then those skills suddenly vanish. The new research found that the odds of developmental regression were twice as high for black children and 1.5 times higher for Hispanic children than they were for white youngsters.

It's estimated that one-third of children with autism go through developmental regression, said lead researcher Dr. Adiaha Spinks-Franklin, of Baylor College of Medicine and Texas Children's Hospital in Houston.

"They learn to babble or talk, then stop. They learn to play patty-cake, then stop," said Spinks-Franklin.

This appears to be the first study to show racial disparities in rates of developmental regression. And for now, the cause is unclear, Spinks-Franklin said.

No one knows why regression happens at all, said Dr. Dan Coury, medical director for the Autism Speaks Autism Treatment Network.

"But it does make us wonder if it might be a different type of autism, with different causes," Coury said.

Autism is a developmental disorder that -- to widely varying degrees -- impairs a child's ability to communicate and interact socially. Some kids have relatively mild problems relating to other people; others speak very little or not at all, and focus obsessively on only a couple of interests and engage in repetitive behaviors.

Researchers have managed to find a few hundred genes related to autism risk, and experts believe the disorder arises from a complex mix of genes and environmental exposures -- though it's not yet clear what those exposures are.

Coury said future studies could look into whether genes play a role in minority children's higher rate of regression. Another question, he said, is whether their parents might have had different environmental exposures before and during pregnancy.

Researching those possibilities, Coury noted, could also give clues to the causes of autism in general.

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