Tools of Precision Medicine May Lead to Earlier Identification and Treatment of Children with Neurodevelopmental Disorders
The study was published in today’s online edition of Science.
About 10 percent of babies with congenital heart disease—which affects the development, structure, and function of the heart—are later diagnosed with neurodevelopmental disorders such as learning disabilities and attention-deficit hyperactivity disorder. As many as 13 percent of children with severe forms of congenitalheart disease also have other types of birth defects.
One possible explanation is that children with congenital heart disease may be deprived of sufficient blood and oxygen flow during critical moments in brain development. Theinvestigators explored the possibility that there is a more fundamental, genetic reason behind why neurodevelopmental disorders and congenital heart disease often occur together.
Looking Within the Genome
“Using the sophisticated tools of genomic sequencing, we can now look deep within the genome and determine if conditions are genetically linked,” said Wendy Chung
, MD, PhD, the Kennedy Family Associate Professor of Pediatrics and Medicine and Director of the Clinical Genetics program at CUMC. If such a linkage exists, then the risk that children with congenital heart disease will develop a neurodevelopmental disorder can be predicted, allowing interventions to be put in place while the brain is still growing and developing. This kind of highly targeted treatment is the goal of the emerging field known as precision medicine.
“As a clinical geneticist who sees children with a variety of conditions, I find it encouraging when a study has direct and immediate benefits for patients and their families,” said Dr. Chung.
In this study, the researchers used genetic information from 1,213 children with congenital heart disease and their parents to sequence the 4,000+ genes that are active during heart development. They then compared this information with previously sequenced data from a registry of 900 families not affected by congenital heart disease, to identify genetic mutations.
The study revealed that many of the children with congenital heart disease had experienced spontaneous mutations in heart development genes. Furthermore, a single genetic mutation was responsible for about 20 percent of cases where severe congenital heart disease was accompanied by neurodevelopmental disorders and/or other congenital problems. These same genes were mutated in only 2 percent of children with congenital heart disease alone, suggesting that the co-occurrence of neurodevelopmental and congenital problems has genetic causes.
Mutations in Children
The researchers also discovered that the mutations in the children born with a combination of heart, brain, and other congenital disorders occurred in a subset of genes that act like conductors, orchestrating the formation and function of organs.
“As a clinical geneticist who sees children with a variety of conditions, I find it encouraging when a study has direct and immediate benefits for patients and their families,” said Dr. Chung. “As genomic sequencing moves out of the realm of research and into the clinic as a diagnostic tool, it will bring with it the power to predict the risk of many kinds of conditions. This is truly precision medicine at its best.”
is titled, “De novo mutations in congenital heart disease with neurodevelopmental and other congenital anomalies.”
The study was supported by grants from the National Institutes of Health (NIH), the National Heart, Lung, and Blood Institute, and the Pediatric Cardiac Genomics Consortium (U01-HL098188, U01-HL098147, U01-HL098153, U01-HL098163, U01-HL098123, U01-HL098162) as well as the Cardiovascular Development Consortium (U01-HL098166) and the National Human Genome Research Institute (U54HG006504) of the National Institutes of Health.
The researchers declare no financial or other conflicts of interest.