Journal
JOURNAL OF DENTAL RESEARCH
Volume 89, Issue 12, Pages 1378-1382Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0022034510382117
Keywords
protein localization; enamel maturation; enamel; tooth; Amelogenesis imperfect
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Funding
- Korean Government (MEST) [M10646010003-08N4601-00310]
- Korean Ministry of Education, Science and Technology [2009-0063266]
- USPHS [DE015846]
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The proven candidate genes for amelogenesis imperfecta (AI) are AMELX, ENAM, MMP20, KLK4, FAM83H, and WDR72. We performed mutation analyses on seven families with hypo-maturation AI. A novel WDR72 dinucleotide deletion mutation (g.57,426_57,427delAT; c.1467_1468delAT; p.V491fsX497) was identified in both alleles of probands from Mexico and Turkey. Haplotype analyses showed that the mutations arose independently in the two families. The disease perfectly segregated with the genotype. Only persons with both copies of the mutant allele were affected. Their hypomineralized enamel suffered attrition and orange-brown staining following eruption. Expression of WDR72 fused to green fluorescent protein showed a cytoplasmic localization exclusively and was absent from the nucleus. We conclude that WDR72 is a cytoplasmic protein that is critical for dental enamel formation.
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