Researchers at the Yale School of Medicine have figured out how to measure an infant’s risk of developing autism by looking for abnormalities in his/her placenta at birth, allowing for earlier diagnosis and treatment for the developmental disorder. The findings are reported in the April 25, 2013 online issue of Biological Psychiatry.
One out of 50 children are diagnosed with an autism spectrum disorder in the United States each year, according to the Centers for Disease Control and Prevention (CDC), but the diagnosis is usually made when these children are 3 to 4 years of age or older. By then the best opportunities for intervention have been lost because the brain is most responsive to treatment in the first year of life.
Senior author Harvey Kliman, M.D., research scientist in the Department of Obstetrics, Gynecology & Reproductive Sciences at the Yale School of Medicine, and research collaborators at the MIND Institute at the University of California, Davis, have found that abnormal placental folds and abnormal cell growths called trophoblast inclusions are key markers to identify newborns who are at risk for autism.
Kliman and his team examined 117 placentas from infants of at-risk families, those with one or more previous children with autism. These families were participating in a study called Markers of Autism Risk in Babies – Learning Early Signs. Kliman compared these at-risk placentas to 100 control placentas collected by the UC Davis researchers from the same geographic area.
The at-risk placentas had as many as 15 trophoblast inclusions, while none of the control placentas had more than two trophoblast inclusions.
A placenta with four or more trophoblast inclusions conservatively predicts an infant with a 96.7% probability of being at risk for autism.
Currently, the best early marker of autism risk is family history. Couples with a child with autism are nine times more likely to have another child with autism. Kliman said that when these at-risk families have subsequent children they could employ early intervention strategies to improve outcomes. “Regrettably couples without known genetic susceptibility must rely on identification of early signs or indicators that may not overtly manifest until the child’s second or third year of life,” said Kliman.
“I hope that diagnosing the risk of developing autism by examining the placenta at birth will become routine, and that the children who are shown to have increased numbers of trophoblast inclusions will have early interventions and an improved quality of life as a result of this test,” Kliman added.
- Kliman HJ, Segel L. (2003) The placenta may predict the baby. J Ther Biol, 225: 143-145.
- Rejniak KA, Kliman HJ, Fauci LJ. (2004) A computational model of the mechanics of growth of the villous trophoblast bilayer. Bull Math Biol, 66:199-23.
- Anderson GM, Jacobs-Stannard A, Chawarska K, Volkmar FR, Kliman HJ. (2007) Placental Trophoblast Inclusions in Autism Spectrum Disorder, Biological Psychiatry, 61:487-91.
- Kliman HJ. Placenta. (2013) In: Encyclopedia of Autistic Spectrum Disorders. Volkmar FR (ed). Springer, New York.
- Walker CK, Anderson KW, Milano KM, Ye S, Tancredi DJ, Pessah IN, Hertz-Picciotto I, Kliman HJ, (2013) Trophoblast Inclusions are Significantly Increased in the Placentas of Children in Families at Risk for Autism, Biological Psychiatry, 74:204-11.
- Kliman HJ, Segel L, Fauci L, Cortez R. Model for the formation of trophoblast inclusions in chorionic villi. Society for Maternal Fetal Medicine, Reno, NV, 2001.
- Kliman HJ, French L. Trophoblast inclusions are associated with karyotypic abnormalities. Society for Maternal Fetal Medicine, Reno, NV, 2001.
Kliman HJ, McSweet JC, Franco A, Ying X, Zhao Y, Stetten G. Trophoblast inclusions are rare in elective terminations and normal deliveries, but common in cases with karyotypic abnormalities. American Society for Reproductive Medicine, San Antonio, Texas, 2003.