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Clock genes rescue nphp mutations in zebrafish.

Nicolas Kayser1, Friedemann Zaiser1, Anna C Veenstra1

  • 1Renal Division, University Freiburg Medical Center, Faculty of Medicine, Hugstetter Str. 55, Freiburg 79106, Germany.

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|July 21, 2022
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Summary
This summary is machine-generated.

Morpholino oligonucleotides (MO) in zebrafish models can overstate ciliopathy phenotypes. Genetic compensation via circadian clock genes like cry1a and cry5 explains these discrepancies, impacting disease modeling accuracy.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Nephrology

Background:

  • The zebrafish pronephros model, utilizing morpholino oligonucleotides (MO) for gene depletion, is a common tool for studying human ciliopathy phenotypes.
  • Recent findings indicate discrepancies between MO-induced phenotypes and those observed in genetically defined mutants, raising concerns about the reliability of MO-based studies.

Purpose of the Study:

  • To investigate the validity of MO-based results by analyzing zebrafish with defined mutations in the nphp1-4-8 gene module.
  • To understand the role of genetic compensation and circadian clock genes in modulating ciliopathy phenotypes in zebrafish.

Main Methods:

  • Analysis of zebrafish carrying mutations in the nphp1-4-8 module.
  • Comparison of phenotypes between MO-depleted zebrafish and genetically mutated zebrafish.
  • Transcriptome analysis of nphp8 mutant embryos to identify differentially expressed genes.
  • MO-mediated depletion of circadian clock genes (cry1a and cry5) in wild-type and mutant zebrafish.

Main Results:

  • MO-mediated depletion caused ciliopathy phenotypes (glomerular cysts, cloaca malformation) at a higher frequency than observed in nphp mutant zebrafish.
  • nphp mutant zebrafish were viable, with reduced phenotypes in subsequent generations. Upregulation of circadian clock genes (cry1a, cry5) was observed in nphp8 mutants.
  • Depletion of cry1a and cry5 induced ciliopathy phenotypes in wild-type embryos and exacerbated phenotypes in nphp8 mutants. cry1a and cry5 also rescued nephropathy phenotypes in MO-depleted zebrafish.

Conclusions:

  • While MO-based zebrafish models resemble nphp mutant phenotypes, they occur at a lower frequency in genetically defined mutants.
  • Rapid adaptation through the upregulation of circadian clock genes appears to ameliorate the loss of nphp genes, contributing to observed phenotypic differences.
  • These findings highlight the importance of considering genetic compensation mechanisms when interpreting MO-based zebrafish models for ciliopathy research.