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Craniofacial morphologic alteration induced by bone-targeted mutants of FGFR2 causing Apert and Crouzon syndrome  

Lee, Kee-Joon (Department of Orthodontics, College of Dentistry and Oral Science Research Center, Institute of Crariofacial Deformity, Yonsei University)
Nah, Hyun-Duck (Department of Biochemistry, College of Dentistry, University of Pennsylvania)
Tjoa, Stephen T. J. (Department of Biochemistry, School of Dental Medicine, University of Pennsylvania)
Park, Young-Chel (Department of Orthodontics, College of Dentistry, Yonsei University)
Baik, Hyoung-Seon (Department of Orthodontics, College of Dentistry, Yonsei University)
Yun, Tae-Min (Department of Orthodontics, College of Dentistry, Yonsei University)
Song, Jin-Wook (Department of Orthodontics, College of Dentistry, Yonsei University)
Publication Information
The korean journal of orthodontics / v.36, no.4, 2006 , pp. 284-294 More about this Journal
Abstract
Objective: Activating mutations in the fibroblast growth factor receptor-2 (FGFR2) have been shown to cause syndromic craniosynostosis such as Apert and Crouzon syndromes. The purpose of this pilot study was to investigate the resultant phenotypes induced by the two distinctive bone-targeted gene constructs of FGFR2, Pro253Arg and Cys278Phe, corresponding to human Apert and Crouzon syndromes respectively. Methods: Wild type and a transgenic mouse model with normal FGFR2 were used as controls to examine the validity of the microinjection. Micro-CT and morphometric analysis on the skull revealed the following results. Results: Both Apert and Crouzon mutants of FGFR2 induced fusion of calvarial sutures and anteroposteriorly constricted facial dimension, with anterior crossbite present only in Apert mice. Apert mice differed from Crouzon mice and transgenic mice with normal FGFR2 in the anterior cranial base flexure and calvarial flexure angle which implies a possible difference in the pathogenesis of the two mutations. In contrast, the transgenic mice with normal FGFR2 displayed normal craniofacial phenotype. Conclusion: Apert and Crouzon mutations appear to lead to genotype-specific phenotypes, possibly causing the distinctive sites and sequence of synostosis in the calvaria and cranial base. The exact function of the altered FGFR2 at each suture needs further investigation.
Keywords
Craniosynostosis; Apert syndrome; Crouzon syndrome; FGFR2;
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