Journal Article

<i>CBFA1</i> Mutation Analysis and Functional Correlation with Phenotypic Variability in Cleidocranial Dysplasia

Guang Zhou, Yuqing Chen, Lei Zhou, Kannan Thirunavukkarasu, Jacqueline Hecht, David Chitayat, Bruce D. Gelb, Sinikka Pirinen, Susan A. Berry, Cheryl R. Greenberg, Gerard Karsenty and Brendan Lee

in Human Molecular Genetics

Volume 8, issue 12, pages 2311-2316
Published in print November 1999 | ISSN: 0964-6906
Published online November 1999 | e-ISSN: 1460-2083 | DOI:
CBFA1 Mutation Analysis and Functional Correlation with Phenotypic Variability in Cleidocranial Dysplasia

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Cleidocranial dysplasia (CCD) is a dominantly inherited skeletal dysplasia caused by mutations in the osteoblast-specific transcription factor CBFA1. To correlate CBFA1 mutations in different functional domains with the CCD clinical spectrum, we studied 26 independent cases of CCD and a total of 16 new mutations were identified in 17 families. The majority of mutations were de novo missense mutations that affected conserved residues in the runt domain and completely abolished both DNA binding and transactivation of a reporter gene. These, and mutations which result in premature termination in the runt domain, produced a classic CCD phenotype by abolishing transactivation of the mutant protein with consequent haploinsufficiency. We further identified three putative hypomorphic mutations (R391X, T200A and 90insC) which result in a clinical spectrum including classic and mild CCD, as well as an isolated dental phenotype characterized by delayed eruption of permanent teeth. Functional studies show that two of the three mutations were hypomorphic in nature and two were associated with significant intrafamilial variable expressivity, including isolated dental anomalies without the skeletal features of CCD. Together these data show that variable loss of function due to alterations in the runt and PST domains of CBFA1 may give rise to clinical variability, including classic CCD, mild CCD and isolated primary dental anomalies.

Journal Article.  4252 words.  Illustrated.

Subjects: Genetics and Genomics

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