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Recessive Mutations in ACP4 Cause Amelogenesis Imperfecta.

Y J Kim1, Y Lee2, Y Kasimoglu3

  • 1Department of Molecular Genetics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.

Journal of Dental Research
|May 26, 2021
PubMed
Summary

New research identifies mutations in the ACP4 gene causing hypoplastic Amelogenesis Imperfecta (AI). These findings reveal how ACP4 dysfunction impacts tooth enamel formation and provides insights into AI mechanisms.

Keywords:
acid phosphatase 4compound heterozygous mutationde novo mutationdimerizationenamelhereditary

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Area of Science:

  • Genetics
  • Biochemistry
  • Dentistry

Background:

  • Amelogenesis imperfecta (AI) is a group of inherited disorders affecting tooth enamel formation and mineralization.
  • AI presents with hypoplastic, hypomaturation, or hypocalcified enamel phenotypes.
  • Recent studies implicated the ACP4 gene in hypoplastic AI, suggesting mutations may impair homodimerization or catalytic activity.

Purpose of the Study:

  • To investigate the genetic basis of hypoplastic AI in Korean and Turkish families.
  • To elucidate the functional consequences of identified ACP4 mutations on protein expression, homodimerization, and enzymatic activity.

Main Methods:

  • Exome sequencing was performed on families with hypoplastic AI.
  • Identified ACP4 mutations were analyzed using cloning, mutagenesis, immunofluorescence, and immunoprecipitation.
  • Acid phosphatase activity assays were conducted to compare wild-type and mutant ACP4 function.

Main Results:

  • Biallelic mutations in the ACP4 gene were identified in two families with hypoplastic AI.
  • Mutant ACP4 proteins exhibited decreased expression levels.
  • Mutant ACP4 showed reduced homodimerization ability and diminished acid phosphatase activity.

Conclusions:

  • The study expands the known spectrum of ACP4 mutations associated with hypoplastic AI.
  • Findings demonstrate that ACP4 mutations impair protein stability, homodimerization, and enzymatic function, contributing to defective amelogenesis.
  • This research enhances the understanding of ACP4's role in normal and pathological tooth enamel development.