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Originally published in Science Express on 3 November 2005
Science 18 November 2005:
Vol. 310. no. 5751, pp. 1184 - 1187
DOI: 10.1126/science.1116142

Reports

GTF2IRD1 in Craniofacial Development of Humans and Mice

May Tassabehji,1* Peter Hammond,2 Annette Karmiloff-Smith,3 Pamela Thompson,1 Snorri S. Thorgeirsson,4 Marian E. Durkin,4 Nicholas C. Popescu,4 Timothy Hutton,2 Kay Metcalfe,1 Agnes Rucka,1 Helen Stewart,5 Andrew P. Read,1 Mark Maconochie,6 Dian Donnai1

Craniofacial abnormalities account for about one-third of all human congenital defects, but our understanding of the genetic mechanisms governing craniofacial development is incomplete. We show that GTF2IRD1 is a genetic determinant of mammalian craniofacial and cognitive development, and we implicate another member of the TFII-I transcription factor family, GTF2I, in both aspects. Gtf2ird1-null mice exhibit phenotypic abnormalities reminiscent of the human microdeletion disorder Williams-Beuren syndrome (WBS); craniofacial imaging reveals abnormalities in both skull and jaws that may arise through misregulation of goosecoid, a downstream target of Gtf2ird1. In humans, a rare WBS individual with an atypical deletion, including GTF2IRD1, shows facial dysmorphism and cognitive deficits that differ from those of classic WBS cases. We propose a mechanism of cumulative dosage effects of duplicated and diverged genes applicable to other human chromosomal disorders.

1 Academic Unit of Medical Genetics, University of Manchester, St. Mary's Hospital, Manchester M13 9PL, UK.
2 Eastman Dental Institute, University College London, London WC1E 6BT, UK.
3 Institute of Child Health, University College London, London WC1E 6BT, UK.
4 National Cancer Institute, Bethesda, MD 20892, USA.
5 Churchill Hospital, Oxford OX3 7LJ, UK.
6 School of Life Sciences, University of Sussex, Brighton BN1 9RH, UK.

* To whom correspondence should be addressed. E-mail: m.tassabehji{at}manchester.ac.uk

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Genetic aspects of birth defects: new understandings of old problems.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)