8q12 microduplication syndrome

Syndrome associated with unusual and characteristic multi-organ clinical features, which include hearing loss, congenital heart defects, intellectual disability, hypotonia in infancy and Duane anomaly. It has been described in two patients. The lack of recurrent breakpoints in these two cases and the absence of any low-copy repeats pairs that flank these de novo events do not support non-allelic homologous recombination as the mutation mechanism. The 8q12 region includes CHD7 and it is proposed that this gene, associated with CHARGE syndrome by haploinsufficiency, causes a different phenotype by gain-of-dosage.

SNOMEDCT_US