Mosaic Williams syndrome: A case report. Issue 1 (20th October 2022)

• Record Type: Journal Article
• Authors: Kalantari, Silvia; Biagio, Marta Di; Valente, Enza Maria; Rossi, Elena; Sirchia, Fabio
• Is Part Of: American journal of medical genetics. Volume 191:Issue 1(2023)
• Page Start: 249
• Page End: 252
• Publication Date: 2022-10-20
• Subjects: 7q11.23 microdeletion -- mosaic microdeletion syndrome -- mosaicism -- Williams syndrome; Medical genetics -- Periodicals; 616.14205
• DOI: 10.1002/ajmg.a.63002
• Languages: English
• ISSNs: 1552-4825

Abstract

Abstract: Williams syndrome (WS) is a well‐known genetic disorder caused by heterozygous microdeletions of the 7q11.23 chromosome region. The main clinical features of the syndrome are characteristic facial dysmorphisms, cardiovascular and endocrine anomalies, short stature, mild‐to‐moderate intellectual disability, and a recognizable cognitive and behavioral profile. Differently from large chromosomal imbalances and aneuploidies, mosaicism has only rarely been found in microdeletion syndromes, and mosaic cases with WS phenotype have never been reported. We here describe a 51‐year‐old female patient with the typical clinical features of WS, whose chromosomal microarray analysis and fluorescence in situ hybridization disclosed a 54%–68% germline mosaicism for 7q11.23 deletion.