PUBLICATION

QDPR homologues in Danio rerio regulate melanin synthesis, early gliogenesis, and glutamine homeostasis

Authors
Breuer, M., Guglielmi, L., Zielonka, M., Hemberger, V., Kölker, S., Okun, J.G., Hoffmann, G.F., Carl, M., Sauer, S.W., Opladen, T.
ID
ZDB-PUB-190418-19
Date
2019
Source
PLoS One   14: e0215162 (Journal)
Registered Authors
Breuer, Maximilian, Carl, Matthias
Keywords
none
MeSH Terms
  • Animals
  • Cell Proliferation/genetics*
  • Dihydropteridine Reductase/genetics
  • Disease Models, Animal
  • Gene Knockdown Techniques
  • Glutamine*/genetics
  • Glutamine*/metabolism
  • Humans
  • Melanins*/biosynthesis
  • Melanins*/genetics
  • Neuroglia/metabolism*
  • Phenylketonurias*/genetics
  • Phenylketonurias*/metabolism
  • Zebrafish*/embryology
  • Zebrafish*/genetics
  • Zebrafish Proteins/genetics
PubMed
30995231 Full text @ PLoS One
Abstract
Dihydropteridine reductase (QDPR) catalyzes the recycling of tetrahydrobiopterin (BH4), a cofactor in dopamine, serotonin, and phenylalanine metabolism. QDPR-deficient patients develop neurological symptoms including hypokinesia, truncal hypotonia, intellectual disability and seizures. The underlying pathomechanisms are poorly understood. We established a zebrafish model for QDPR deficiency and analyzed the expression as well as function of all zebrafish QDPR homologues during embryonic development. The homologues qdpra is essential for pigmentation and phenylalanine metabolism. Qdprb1 is expressed in the proliferative zones of the optic tectum and eye. Knockdown of qdprb1 leads to up-regulation of pro-proliferative genes and increased number of phospho-histone3 positive mitotic cells. Expression of neuronal and astroglial marker genes is concomitantly decreased. Qdprb1 hypomorphic embryos develop microcephaly and reduced eye size indicating a role for qdprb1 in the transition from cell proliferation to differentiation. Glutamine accumulation biochemically accompanies the developmental changes. Our findings provide novel insights into the neuropathogenesis of QDPR deficiency.
Genes / Markers
Figures
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Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping