Interstitial deletions at chromosome 8q22.2-q22.3 have been rarely reported
in the literature. To date, six patients have been described
in the literature with deletions vary
ing
in size from 1.36 Mb to 6.44 Mb. These patients range
in age from
early childhood to
early adulthood. The
interstitial deletion phenotype has been described to
involve moderate to severe
intellectual disability, seizures and a dist
inct facial phenotype. We report on a 40-year-old male with a 3.351 Mb deletion at chromosome 8q22.2-q22.3 who presents with moderate
intellectual disability,
autism spectrum disorder,
childhood seizure disorder, congenital heart defect and hear
ing loss. He is the oldest known patient to date.
Methods
Array comparative genomic hybridization (aCGH) was performed on DNA extracted from peripheral blood.
Conclusion
This is the first report of an individual with chromosome 8q22.2-q22.3 interstitial deletion associated with congenital heart disease and hearing loss. Haploinsufficiency of the GRHL2 gene contained within the microdeletion is proposed as a candidate genetic mechanism for this patient's hearing loss.