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Molecular mechanism of abnormal dentin calcification in dentinogenesis imperfecta

Research Project

Project/Area Number 11671800
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Morphological basic dentistry
Research InstitutionOsaka University

Principal Investigator

TOYOSAWA Satoru  Graduate School of Dentistry, Osaka University, Assistant Professor, 歯学研究科, 講師 (30243249)

Co-Investigator(Kenkyū-buntansha) FUJIWARA Taku  Dental Hospital, Osaka University, Assistant Professor, 歯学部・附属病院, 講師 (00228975)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsAmeloblastin / Dentin matrix protein 1 / Dentin sialophosphoprotein / Dentinogenesis imperfecta / Genome / Polymorphism / Osteocyte
Research Abstract

The dental disorder "dentinogenesis imperfecta type II (DGI-typeII)" is an autosomal dominant condition that has a prevalence of 1 in 6,000-8,000 individuals. Linkage studies had previously mapped DGI to chromosome 4q13-21, where several candidate genes that encode tooth extracellular matrix proteins (ameloblastin, dentin matrix protein 1, have also been mapped. We focused two genes (ameloblastin and dentin matrix protein 1, Dentin sialophosphoprotein) of them and analyzed them by molecular level.
Human ameloblastin (AMBN) gene had not sequenced so far. Therefore, we isolated the full-length human AMBN cDNA.Sequence analysis of the AMBN cDNA revealed an open reading frame of 1341 bp encoding a 447-amino acid protein. Comparison with pig, cattle, rat, and mouse AMBN sequences showed high amino acid sequence similarity and led to the identification of a novel 78 bp (26-amino acid) insert resulting from internal sequence duplication. By DNA analysis of a human genomic clones, the AMBN gene was shown to consist of 13 exons and a novel 78 bp segment which proved to comprise two small exons. There were little polymorphisms of human AMBN gene in Asian populations.
Dentin matrix protein 1 (DMP1) is an acidic phosphoprotein expressed in tooth organ and bone. We demonstrated that in chicken, which is not capable of forming tooth, DMP1 mRNA is highly expressed in bone by Northern blot analysis. To clarify the significance of DMP1 expression in bone, the expression of DMP1 mRNA and its protein was examined in chicken and rat. In the chicken and rat, DMP1 mRNA was detected only in bone tissues and was localized in osteocytes but not in osteoblasts. Antiserum was raised against the peptide from rat DMP1, and the localization of DMP1 was examined by immunohistochemistry. These data demonstrate that DMP1 is a bone matrix protein specifically expressed in osteocytes.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 豊澤悟 ら: "Dentin matrix protein 1 is predominantly expressed in chicken and rat asteosytes, but not in asteoblasts."J.Bone Miner.Res.. (in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 豊澤悟 ら: "Cloning and characterization of human ameloblastin gene."Gene. 256. 1-11 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 新谷誠康 ら: "Biglycan-like extra cellular matrix genes of agrathans and teleosts."J.Mol.Evol.. 51. 363-373 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 豊澤悟 ら: "Expression of dentin matrix protein 1 gene in birds."J.Mol.Evol.. 50. 31-38 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 豊澤悟 ら: "Characterization of dentin matrix protein 1 gene in crocodilia."Gene. 234. 307-314 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 豊澤悟 ら: "The dentin matrix protein 1 gene of Prototherian and Metatherian mammals."J.Mol.Evol... 48. 160-167 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyosawa S.et al.: "Dentin matrix protein 1 is predominantly expressed in chicken and rat osteocytes, but not in osteoblasts."(in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyosawa S.et al.: "Cloning and characterization of the human ameloblastin gene."Gene. 256. 1-11.17 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Shintani S.et al.: "Biglycan-like extracellular matrix genes of agnathans and teleosts."J.Mol.Evol.. 51. 363-373 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyosawa, S.et al.: "Expression of dentin matrix protein 1 gene in birds."J.Mol.Evol.. 50. 31-38 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyosawa, S.et al.: "Characterization of dentin matrix protein 1 gene in crocodilia."Gene. 234. 307-314 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyosawa, S.et al.: "Dentin matrix protein 1 gene of prototherian and metatherian mammals"J.Mol.Evol.. 48. 160-167 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 豊澤悟: "Dentin matrix protein 1 is predominantly expressed in chicken and rat oiteocytes, but not in osteoblasts."J.Bone & Miner.Res. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 豊澤悟: "Cloning and characterization of human ameloblastin gene."Gene. 256. 1-11 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 豊澤悟: "Expression of dentin matrix protein 1 gene in birds."J.Mol.Evol.. 50. 31-38 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 豊澤 悟: "Expression of dentin matrix protein 1 gene in birds"J. Mol. Evol.. 50. 31-38 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 豊澤 悟: "Characterization of dentin matrix protein 1 gene in crocodilia"Gene. 234. 307-314 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 豊澤 悟: "Dentin matrix protein 1 gene of prototherian and metatherian ・・・・"J. Mol. Evol.. 48. 160-167 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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