Publication
Title
No evidence for GNAS copy number variants in patients with features of Albright's hereditary osteodystrophy and abnormal platelet Gs activity
Author
Abstract
Albright's hereditary osteodystrophy (AHO) is characterized by short stature, round face, calcifications, obesity, brachydactyly and intellectual disability. AHO without hormone resistance is called pseudopseudohypoparathyroidism (PPHP), a rare clinical condition difficult to diagnose with highly variable features. PPHP is caused by paternally inherited loss-of-function mutations in the GNAS. Patients with 2q37 microdeletions or HDAC4 mutations are also defined as having an AHO-like phenotype with normal stimulatory G (Gs) function. We have studied 256 patients with AHO features but no other diagnosis. Their platelet Gs activity was determined via the aggregation-inhibition test showing Gs hypo-or hyperfuncton in 24% and 15% of the patients, respectively. Before initiating with detailed (epi)genetic GNAS studies, we here wanted to excluded copy number variants (CNVs) in GNAS as cause of AHO with a novel large-scale screening technique. Multiplex amplicon quantification (MAQ) for CNVs screening was developed for the 20q13.3 region including GNAS and potential long-range imprinting control elements such as STX16. This is the first large-scale GNAS CNV study in patients with common AHO features but no CNVs were detected. In conclusion, CNVs in the GNAS region are not likely to cause an AHO-like phenotype with or without abnormal platelet Gs activity. Future studies will be undertaken to find out whether these AHO patients with abnormal Gs function are characterized by GNAS coding or methylation defects. Journal of Human Genetics (2012) 57, 277-279; doi:10.1038/jhg.2012.1; published online 26 January 2012
Language
English
Source (journal)
Journal of human genetics. - New York, N.Y.
Publication
New York, N.Y. : 2012
ISSN
1434-5161
Volume/pages
57:4(2012), p. 277-279
ISI
000303416800011
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
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Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
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Creation 05.06.2012
Last edited 22.08.2017
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