[Analysis of ADNP gene variant in a child with Helsmoortel-van der Aa syndrome].

OBJECTIVE

To explore the genetic basis for a child manifesting with intellectual disability, language delay and autism spectrum disorder.

METHODS

Genomic DNA was extracted from peripheral blood samples of the child and his family members, and subjected to whole exome sequencing. Candidate variants were verified by Sanger sequencing and interpreted according to the guidelines of the American College of Medical Genetics and Genomics.

RESULTS

The child was found to harbor a heterozygous c.568C>T (p.Q190X) nonsense variant of the ADNP gene, which was not detected in either parent by Sanger sequencing.

CONCLUSION

The clinical and genetic testing both suggested that the child has Helsmoortel-van der Aa syndrome due to ADNP gene mutation, which is extremely rare in China.