Human ameloblastin gene: genomic organization and mutation analysis in amelogenesis imperfecta patients

European Journal of Oral Sciences
Carina K MårdhK Forsman-Semb

Abstract

A gene encoding the enamel protein ameloblastin (AMBN) was recently localized to a region on chromosome 4q21 containing a gene for the inherited enamel defect local hypoplastic amelogenesis imperfecta (AIH2). Ameloblastin protein is located at the Tomes processes of secretory ameloblasts and in the sheath space between rod-interrod enamel, and the AMBN gene therefore represents a viable candidate gene for local hypoplastic amelogenesis imperfecta (AI). In this study, the genomic organization of human AMBN was characterized. The gene was shown to consist of 13 exons and 12 introns. An alternatively spliced 45 bp sequence was shown not to represent a separate exon and is most likely spliced by the use of a cryptic splice site. The finding that there were no recombinations between an intragenic microsatellite and AIH2 encouraged us to evaluate this gene's potential role as a candidate gene for local hypoplastic AI. Mutation screening was performed on all 13 exons in 20 families and 8 sporadic cases with 6 different forms of AI. DNA variants were found but none that was associated exclusively with local hypoplastic AI or any of the other variants of AI in the identified Swedish families. This study excludes the coding regions and t...Continue Reading

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Citations

Oct 14, 2003·Journal of Dentistry·Gamze ArenErhan Firatli
May 21, 2011·Cells, Tissues, Organs·Junsheng FengShuo Chen
Feb 3, 2007·Head & Face Medicine·Maria C L G SantosSergio R P Line
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