{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T05:41:48Z","timestamp":1791092508377,"version":"4.1.0"},"reference-count":70,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2008,3,24]],"date-time":"2008-03-24T00:00:00Z","timestamp":1206316800000},"content-version":"vor","delay-in-days":83,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Dev Disabil Res Revs"],"published-print":{"date-parts":[[2008,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Several recurrent, constitutional genomic disorders are present on chromosome 22q. These include the translocations and deletions associated with DiGeorge and velocardiofacial syndrome and the translocations that give rise to the recurrent t(11;22) supernumerary der(22) syndrome (Emanuel syndrome). The rearrangement breakpoints on 22q cluster around the chromosome\u2010specific segmental duplications of proximal 22q11, which are involved in the etiology of these disorders. While the deletions are the result of nonallelic homologous recombination (NAHR) between low copy repeats or segmental duplications within 22q11, the t(11;22) is the result of rearrangement between palindromic AT\u2010rich repeats on 11q and 22q. Here we describe the mechanisms responsible for these recurrent rearrangements, discuss the recurrent deletion endpoints that are the result of NAHR between chromosome 22q specific low copy repeats as well as present current diagnostic approaches to deletion detection. \u00a9 2008 Wiley\u2010Liss, Inc. 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