ZFIN ID: ZDB-PUB-180722-16
Generation and Validation of a Complete Knockout Model of abcc6a In Zebrafish
Van Gils, M., Willaert, A., De Vilder, E.Y.G., Coucke, P., Vanakker, O.M.
Date: 2018
Source: The Journal of investigative dermatology   138(11): 2333-2342 (Journal)
Registered Authors: Coucke, Paul, Willaert, Andy
Keywords: none
MeSH Terms:
  • ATP-Binding Cassette Transporters/genetics*
  • Animals
  • CRISPR-Cas Systems
  • Calcification, Physiologic/genetics
  • Disease Models, Animal
  • Gene Knockout Techniques
  • Humans
  • Morpholinos/genetics
  • Mutation/genetics*
  • Phenotype
  • Pseudoxanthoma Elasticum/genetics*
  • Ribs/physiology*
  • Scoliosis/genetics*
  • Spine/physiology*
  • Zebrafish
  • Zebrafish Proteins/genetics*
PubMed: 30030150 Full text @ J. Invest. Dermatol.
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ABSTRACT
Pseudoxanthoma elasticum is an ectopic mineralization disease due to biallelic ABCC6 mutations. As no treatment options are currently available a reliable zebrafish model is invaluable for high throughput compound screening. However, data from previously reported knockdown and mutant zebrafish models for abcc6a, the functional orthologue of ABCC6, showed phenotypic discrepancies. To address this, we developed a complete abcc6a knockout model using CRISPR/Cas9 and compared its phenotype to that of a mutant model (Sa963) and a splice junction morpholino model. Our data showed that abcc6a is not required for embryonic survival but rather that it has an essential role in controlling mineralization. The three models developed very similar hypermineralization of spine and ribs starting embryonically and progressing in adulthood with development of scoliosis. Our results indicate a direct relation between loss of abcc6a expression and dysregulated osteogenesis. As such, our models recapitulate part of the human phenotype in which ectopic mineralization and pro-osteogenic signaling have been reported. Because of its reproducibility in three models and its ease of quantification, we consider this phenotype to be unequivocally the result of abcc6 deficiency and as such as an excellent readout for drug screening purposes and multiplex mutagene analysis.
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