The Modified Shields Classification and 12 Families with Defined DSPP Mutations

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Simmer J. P., Zhang H., Moon S. J. H., Donnelly L. A., Lee Y., Seymen F., ...Daha Fazla

GENES, cilt.13, sa.5, 2022 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 13 Sayı: 5
  • Basım Tarihi: 2022
  • Doi Numarası: 10.3390/genes13050858
  • Dergi Adı: GENES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, BIOSIS, CAB Abstracts, Chemical Abstracts Core, EMBASE, MEDLINE, Veterinary Science Database, Directory of Open Access Journals
  • Anahtar Kelimeler: dentinogenesis imperfecta, Shields Classification, DSPP mutations, dentin dysplasia, enamel malformations, whole-exome sequencing (WES), Single Molecule Real-Time (SMRT) DNA sequencing, DENTIN SIALOPHOSPHOPROTEIN MUTATION, PHOSPHOPROTEIN FRAMESHIFT MUTATIONS, RAT-INCISOR DENTIN, IMPERFECTA TYPE-II, DENTINOGENESIS IMPERFECTA, OSTEOGENESIS IMPERFECTA, ENDOPLASMIC-RETICULUM, OPALESCENT DENTIN, GENE, SIALOPROTEIN
  • İstanbul Üniversitesi Adresli: Evet

Özet

Mutations in Dentin Sialophosphoprotein (DSPP) are known to cause, in order of increasing severity, dentin dysplasia type-II (DD-II), dentinogenesis imperfecta type-II (DGI-II), and dentinogenesis imperfecta type-III (DGI-III). DSPP mutations fall into two groups: a 5 '-group that affects protein targeting and a 3 '-group that shifts translation into the -1 reading frame. Using whole-exome sequence (WES) analyses and Single Molecule Real-Time (SMRT) sequencing, we identified disease-causing DSPP mutations in 12 families. Three of the mutations are novel: c.53T>C/p.(Val18Ala); c.3461delG/p.(Ser1154Metfs*160); and c.3700delA/p.(Ser1234Alafs*80). We propose genetic analysis start with WES analysis of proband DNA to identify mutations in COL1A1 and COL1A2 causing dominant forms of osteogenesis imperfecta, 5 '-DSPP mutations, and 3 '-DSPP frameshifts near the margins of the DSPP repeat region, and SMRT sequencing when the disease-causing mutation is not identified. After reviewing the literature and incorporating new information showing distinct differences in the cell pathology observed between knockin mice with 5 '-Dspp or 3 '-Dspp mutations, we propose a modified Shields Classification based upon the causative mutation rather than phenotypic severity such that patients identified with 5 '-DSPP defects be diagnosed as DGI-III, while those with 3 '-DSPP defects be diagnosed as DGI-II.