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- W2012026008 abstract "The chromosome 22q11 region is prone to rearrangements, including deletions and duplications, due to the presence of multiple low copy repeats (LCRs). DiGeorge/velo-cardio-facial syndrome is the most common microdeletion syndrome with more than 90% of patients having a common 3-Mb deletion of 22q11.2 secondary to non-homologous recombination of flanking LCRs. Meiotic reciprocal events caused by LCR-mediated rearrangement should theoretically lead to an equal number of deletions and duplications. Duplications of this region, however, have been infrequently reported and vary in size from 3 to 6 Mb. This discrepancy may be explained by the difficulty in detecting the duplication and the variable, sometimes quite mild phenotype. This newly described 22q duplication syndrome is characterized by palatal defects, cognitive deficits, minor ear anomalies, and characteristic facial features. We report on a male with truncus arteriosus and an interrupted aortic arch, immunodeficiency, and hypocalcemia. The patient is mosaic for two abnormal cell lines: a deletion [del(22)(q11.2q11.2)] found in 11 cells and a duplication [dup(22)(q11.2q11.2)] found in 9 cells. Molecular cytogenetic analysis in our patient revealed a 1.5 Mb deletion/duplication, the first duplication reported of this size. Deletion/duplication mosaicism, which is rare, has been reported in a number of cases involving many different chromosome segments. We present the clinical phenotype of our patient in comparison to the phenotypes seen in patients with the 22q11.2 deletion or duplication alone. We propose that this rearrangement arose by a mitotic event involving unequal crossover in an early mitotic division facilitated by LCRs. © 2007 Wiley-Liss, Inc." @default.
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- W2012026008 date "2007-01-01" @default.
- W2012026008 modified "2023-10-10" @default.
- W2012026008 title "Mosaicism del(22)(q11.2q11.2)/dup(22)(q11.2q11.2) in a patient with features of 22q11.2 deletion syndrome" @default.
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- W2012026008 doi "https://doi.org/10.1002/ajmg.a.31697" @default.
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