Modelling Lowe syndrome and Dent-2 disease using zebrafish.

Area of Science:

• Genetics
• Developmental Biology
• Molecular Biology

Background:

• Lowe syndrome and Dent-2 disease stem from mutations in the OCRL gene, affecting an inositol 5-phosphatase.
• These genetic disorders impact the eyes, brain, and kidneys, with Dent-2 disease presenting milder extra-renal symptoms.

Purpose of the Study:

• To investigate the in vivo function of OCRL using zebrafish models.
• To establish zebrafish as a model for studying Lowe syndrome and Dent-2 disease.
• To explore potential therapeutic strategies for these rare genetic conditions.

Main Methods:

• Creating and analyzing zebrafish deficient in OCRL.
• Investigating neurodevelopmental defects potentially linked to endosomal trafficking or primary cilia.
• Characterizing renal tubular phenotypes, including endocytosis, lysosomal function, and tubule morphology.
• Conducting chemical and genetic rescue experiments.

Main Results:

• OCRL-deficient zebrafish exhibit neurodevelopmental abnormalities.
• These zebrafish display renal tubular defects such as impaired endocytosis and shortened tubules.
• The observed renal defects correlate with low molecular weight proteinuria seen in patients.
• Rescue experiments demonstrate the potential for therapeutic intervention.

Conclusions:

• Zebrafish serve as a valuable in vivo model for Lowe syndrome and Dent-2 disease.
• The zebrafish model recapitulates key pathological features of these conditions.
• This model system facilitates the screening of potential therapeutic approaches.