title: Williams Syndrome and 15q Duplication: Coincidence versus Association.
abstract: Williams syndrome is a multisystem disorder caused by contiguous gene deletion in 7q11.23, commonly associated with distinctive facial features, supravalvular aortic stenosis, short stature, idiopathic hypercalcemia, developmental delay, joint laxity, and a friendly personality. The clinical features of 15q11q13 duplication syndrome include autism, mental retardation, ataxia, seizures, developmental delay, and behavioral problems. We report a rare case of a girl with genetically confirmed Williams syndrome and coexisting 15q duplication syndrome. The patient underwent treatment for central precocious puberty and later presented with primary amenorrhea. The karyotype revealed 47,XX,+mar. FISH analysis for the marker chromosome showed partial trisomy/tetrasomy for proximal chromosome 15q (15p13q13). FISH using anELN-specific probe demonstrated a deletion in the Williams syndrome critical region in 7q11.23. To our knowledge, a coexistence of Williams syndrome and 15q duplication syndrome has not been reported in the literature. Our patient had early pubertal development, which has been described in some patients with Williams syndrome. However, years later after discontinuing gonadotropin-releasing hormone analogue treatment, she developed primary amenorrhea.
authors.affiliation: Division of Pediatric Endocrinology, SUNY Downstate Medical Center and Kings County Hospital Center, Brooklyn, N.Y., USA; Department of Pediatrics, SUNY Downstate Medical Center and Kings County Hospital Center, Brooklyn, N.Y., USA.
authors.forename: Aditi
authors.initials: A
authors.lastname: Khokhar
authors.affiliation: Department of Pediatrics, SUNY Downstate Medical Center and Kings County Hospital Center, Brooklyn, N.Y., USA.
authors.forename: Swashti
authors.initials: S
authors.lastname: Agarwal
authors.affiliation: Division of Pediatric Endocrinology, SUNY Downstate Medical Center and Kings County Hospital Center, Brooklyn, N.Y., USA; Department of Pediatrics, SUNY Downstate Medical Center and Kings County Hospital Center, Brooklyn, N.Y., USA.
authors.forename: Sheila
authors.initials: S
authors.lastname: Perez-Colon
keywords: Central precocious puberty; Duplication 15q; Gonadotropin-releasing hormone; Williams syndrome