Study shows delays in siblings of children with autism spectrum disorders

A new University of Miami (UM) study shows that one in three children who have an older sibling with an Autism Related Disorder (ASD) fall into a group characterized by higher levels of autism-related behaviors or lower levels of developmental progress. The study will be presented at the International Meeting for Autism Research (IMFAR) in May, 2012. ASDs are developmental conditions characterized by problems with social interaction and communication. Previously, an international consortium of researchers found that almost one in five of the younger siblings of children with an ASD themselves developed an ASD.

UM's College of Arts and Sciences professor Dr. Daniel Messinger, presenting author of the study, says, "It is clear that the of a child with an may face challenges even if they are not themselves identified with an ASD. This new work identifies classes of outcomes in these children. We found that the majority of these high risk siblings appear to be developing normally. However, a higher than expected proportion of the children face challenges related to higher levels of autism-related behaviors or lower levels of verbal and non-verbal developmental functioning."

The study reveals that difficulties faced by the younger siblings of children with ASD involve both lower levels of verbal and nonverbal functioning and higher levels of autism-related problems. Examples of a child's autism-related problems ─ which are not as severe as those of children with an ASD ─ include lower levels of back-and-forth play with others and lower levels of pointing to express interest in what is going on around them.

Overall, the research says, the majority of siblings are developing typically at three years of age, but the development of a substantial minority is affected by subtler forms of ASD-related problems or lower levels of developmental functioning. Lower levels of developmental functioning and higher levels of autism-related problems in the at-risk siblings define what researchers refer to as the broad autism phenotype.

add to favorites email to friend print save as pdf

Related Stories

Brain scans detect autism's signature

Nov 15, 2010

An autism study by Yale School of Medicine researchers using functional magnetic resonance imaging (fMRI) has identified a pattern of brain activity that may characterize the genetic vulnerability to developing autism spectrum ...

Recommended for you

A link between Jacobsen syndrome and autism

Sep 15, 2014

(Medical Xpress)—A rare genetic disorder known as Jacobsen syndrome has been linked with autism, according to a recent joint investigation by researchers at San Diego State University and the University ...

Sex hormones may play a part in autism

Sep 08, 2014

Higher rates of Autism Spectrum Disorders in males than females may be related to changes in the brain's estrogen signalling, according to research published in the open access journal Molecular Autism.

Planning a better future for people with autism

Aug 27, 2014

In the world of special education, transition is the move from school to adult life. For most of us that move can be awkward, but for people with disabilities—particularly autism—it is especially complex.

User comments