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Type: Journal article
Title: Functional characterization of GATA3 mutations causing the hypoparathyroidism-deafness-renal (HDR) dysplasia syndrome: insight into mechanisms of DNA binding by the GATA3 transcription factor
Author: Ali, A.
Christie, P.
Grigorieva, I.
Harding, B.
Van Esch, H.
Ahmed, S.
Bitner-Glindzicz, M.
Blind, E.
Bloch, C.
Christin, P.
Clayton, P.
Gecz, J.
Gilbert-Dussardier, B.
Guillen-Navarro, E.
Hackett, A.
Halac, I.
Hendy, G.
Lalloo, F.
Mache, C.
Mughal, Z.
et al.
Citation: Human Molecular Genetics, 2007; 16(3):265-275
Publisher: Oxford Univ Press
Issue Date: 2007
ISSN: 0964-6906
Statement of
Asif Ali, Paul T. Christie, Irina V. Grigorieva, Brian Harding, Hilde Van Esch, S. Faisal Ahmed, Maria Bitner-Glindzicz, Eberhard Blind, Catherine Bloch, Patricia Christin, Peter Clayton, Jozef Gecz, Brigitte Gilbert-Dussardier, Encarna Guillen-Navarro, Anna Hackett, Isil Halac, Geoffrey N. Hendy, Fiona Lalloo, Christoph J. Mache, Zulf Mughal, Albert C.M. Ong, Choni Rinat, Nicholas Shaw, Sarah F. Smithson, John Tolmie, Jacques Weill, M. Andrew Nesbit and Rajesh V. Thakker
Abstract: The hypoparathyroidism-deafness-renal (HDR) dysplasia syndrome is an autosomal dominant disorder caused by mutations of the dual zinc finger transcription factor, GATA3. We investigated 21 HDR probands and 14 patients with isolated hypoparathyroidism for GATA3 abnormalities. Thirteen different heterozygous germline mutations were identified in patients with HDR. These consisted of three nonsense mutations, six frameshifting deletions, two frameshifting insertions, one missense (Leu348Arg) mutation and one acceptor splice site mutation. The splice site mutation was demonstrated to cause a pre-mRNA processing abnormality leading to the use of an alternative acceptor site 8 bp downstream of the normal site, resulting in a frameshift and prematurely terminated protein. Electrophoretic mobility shift assays (EMSAs) revealed three classes of GATA3 mutations: those that lead to a loss of DNA binding which represent over 90% of all mutations, and involved a loss of the carboxy-terminal zinc finger; those that resulted in a reduced DNA-binding affinity; and those (e.g. Leu348Arg) that did not alter DNA binding or the affinity but likely altered the conformational change that occurs during binding in the DNA major groove as predicted by a three-dimensional modeling. These results elucidate further the molecular mechanisms underlying the altered functions of mutants of this zinc finger transcription factor and their role in causing this developmental anomaly. No mutations were identified in patients with isolated hypoparathyroidism, thereby indicating that GATA3 abnormalities are more likely to result in two or more of the phenotypic features of the HDR syndrome and not in one, such as isolated hypoparathyroidism.
Keywords: Kidney
Abnormalities, Multiple
DNA-Binding Proteins
RNA Splice Sites
Amino Acid Sequence
Base Sequence
Models, Biological
Models, Molecular
Molecular Sequence Data
Child, Preschool
Infant, Newborn
GATA3 Transcription Factor
Provenance: Human Molecular Genetics Advance Access originally published online on January 8, 2007
Rights: Copyright © The Author 2007. Published by Oxford University Press. All rights reserved.
DOI: 10.1093/hmg/ddl454
Appears in Collections:Aurora harvest
Paediatrics publications

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