Establishment of Two Mouse Models for CEDNIK Syndrome Reveals the Pivotal Role of SNAP29 in Epidermal Differentiation

J Invest Dermatol. 2016 Mar;136(3):672-679. doi: 10.1016/j.jid.2015.12.020. Epub 2015 Dec 30.

Abstract

Loss-of-function mutations in the synaptosomal-associated protein 29 (SNAP29) gene cause the cerebral dysgenesis, neuropathy, ichthyosis, and keratoderma syndrome. In this study, we created total (Snap29(-/-)) as well as keratinocyte-specific (Snap29(fl/fl)/K14-Cre) Snap29 knockout mice. Both mutant mice exhibited a congenital distinct ichthyotic phenotype resulting in neonatal lethality. Mutant mice revealed acanthosis and hyperkeratosis as well as abnormal keratinocyte differentiation and increased proliferation. In addition, the epidermal barrier was severely impaired. These results indicate an essential role of SNAP29 in epidermal differentiation and barrier formation. Markedly decreased deposition of lamellar body contents in mutant mice epidermis and the observation of malformed lamellar bodies indicate severe impairments in lamellar body function due to the Snap29 knockout. We also found increased microtubule associated protein-1 light chain 3, isoform B-II levels, unchanged p62/SQSTM1 protein amounts, and strong induction of the endoplasmic reticulum stress marker C/EBP homologous protein in mutant mice. This emphasizes a role of SNAP29 in autophagy and endoplasmic reticulum stress. Our murine models serve as powerful tools for investigating keratinocyte differentiation processes and provide insights into the essential contribution of SNAP29 to epidermal differentiation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Autophagy / genetics
  • Blotting, Western
  • Cell Differentiation / genetics*
  • Cells, Cultured
  • Disease Models, Animal
  • Epidermal Cells
  • Gene Expression Regulation*
  • Immunohistochemistry
  • Keratinocytes / metabolism
  • Keratinocytes / pathology
  • Keratoderma, Palmoplantar / genetics
  • Keratoderma, Palmoplantar / pathology*
  • Mice
  • Mice, Knockout
  • Neurocutaneous Syndromes / genetics
  • Neurocutaneous Syndromes / pathology*
  • Qb-SNARE Proteins / genetics*
  • Qc-SNARE Proteins / genetics*
  • Random Allocation
  • Reference Values

Substances

  • Qb-SNARE Proteins
  • Qc-SNARE Proteins
  • Snap29 protein, mouse

Supplementary concepts

  • Cerebral dysgenesis, neuropathy, ichthyosis, and palmoplantar keratoderma syndrome