Open Access22q11.2 Microduplications: Two Clinical Reports Compared with Similar Cases from the Literature
Author(s) -
Aderonke Oyetunji,
Merlin G. Butler
Publication year - 2020
Publication title -
journal of pediatric genetics
Language(s) - English
Resource type - Journals
eISSN - 2146-4596
pISSN - 2146-460X
DOI - 10.1055/s-0039-1700980
Subject(s) - intellectual disability , digeorge syndrome , breakpoint , genetics , autism , gene duplication , chromosome , microarray , autism spectrum disorder , copy number variation , high resolution , deletion syndrome , biology , medicine , gene , phenotype , genome , psychiatry , gene expression , remote sensing , geology
We present two male subjects (6 and 14 years old) with mild dysmorphism, intellectual disability, and/or autism spectrum disorder with chromosome 22q11.2 microduplications of different sizes. We then compared the clinical and genetic findings with similar cases from the literature sharing the same 22q11.2 duplications. These rare duplications in our subjects were identified by high-resolution chromosomal microarray analysis and flanked by low copy repeats in the 22q11.2 region, specifically LCR22A, LCR22B, and LCR22D. The typical 22q11.2 defect generally involves a deletion at breakpoints LCR22A and LCR22D causing DiGeorge or velo-cardio-facial syndrome and not duplications of varying sizes as seen in our male subjects.