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Related Experiment Video

Updated: Jan 12, 2026

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Investigating the Role of Zebrafish Retinoschisin Homologs Rs1a and Rs1b During Retinal Development.

Isa van der Veen1,2, Céline Koster1,2, Jacoline B Ten Brink2

  • 1Department of Ophthalmology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.

Developmental Neurobiology
|October 31, 2025
PubMed
Summary

X-linked juvenile retinoschisis (XLRS) is a retinal disease caused by retinoschisin (RS1) deficiency. Zebrafish models reveal Rs1

Keywords:
X‐linked juvenile retinoschisisdanio reriomorpholino oligoretinal developmentretinoschisin

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Area of Science:

  • Developmental Biology
  • Ophthalmology
  • Genetics

Background:

  • X-linked juvenile retinoschisis (XLRS) is a genetic retinal degenerative disease.
  • Retinoschisin (RS1) protein deficiency causes XLRS, disrupting retinal structure and function.
  • The role of RS1 in early retinal development is not fully understood.

Purpose of the Study:

  • To investigate the role of Rs1 in early zebrafish retinal development.
  • To establish and validate a zebrafish model for RS1 deficiency.
  • To analyze the effects of Rs1 knockdown on retinal gene expression and protein levels.

Main Methods:

  • Developed a zebrafish model by morpholino-mediated knockdown of rs1a and rs1b homologs.
  • Assessed gene and protein expression using immunohistochemistry (IHC) and RNA sequencing.
  • Analyzed samples at various developmental stages (48-120 hpf).

Main Results:

  • Rs1a and Rs1b expression initiated at 48 hpf; successful Rs1 knockdown confirmed by IHC.
  • Axon guidance and visual perception gene pathways were enriched at 72 and 96 hpf, respectively.
  • Photoreceptor protein levels decreased in Rs1-deficient retinae at later stages (96-120 hpf).

Conclusions:

  • The zebrafish model effectively mimics aspects of XLRS.
  • Rs1 plays a crucial role in early retinal development, influencing axon guidance and photoreceptor integrity.
  • Zebrafish are a valuable model for studying XLRS pathogenesis and potential therapies.