Making sense of carbonic anhydrase function in zebrafish using antisense morpholinos

Area of Science:

• Developmental Biology
• Genetics
• Biochemistry

Background:

• Zebrafish (Danio rerio) are a key vertebrate model for studying gene function due to transparent embryos and rapid development.
• Carbonic anhydrases (CAs) and carbonic anhydrase-related proteins (CARPs) are crucial for pH regulation, ion transport, and CO₂ metabolism.
• Understanding CA and CARP roles is vital for insights into vertebrate development and human disorders.

Purpose of the Study:

• To review the application of morpholino oligonucleotides (MOs) for investigating CA and CARP functions in zebrafish.
• To present novel findings on CA roles in neural development, reproduction, and swim bladder formation.
• To compare MOs with CRISPR/Cas9 for functional genomics in zebrafish.

Main Methods:

• Utilized morpholino oligonucleotides (MOs) for transient gene knockdown of CAs and CARPs in zebrafish embryos.
• Conducted extensive laboratory studies over a decade to analyze knockdown phenotypes.
• Performed comparative analysis of MOs versus CRISPR/Cas9 genome editing techniques.

Main Results:

• MO knockdown studies revealed novel roles for CAs in zebrafish neural development, reproduction, and swim bladder formation.
• Confirmed previously reported functions of CAs in pigmentation, acid-base homeostasis, neural development, and motor coordination, consistent with human studies.
• Identified challenges and technical considerations for MO use, including off-target effects and the need for rescue experiments.

Conclusions:

• Antisense technology, particularly MOs, remains a valuable tool for functional genomics and understanding vertebrate development.
• Zebrafish studies on CAs provide insights into human carbonic anhydrase-related disorders and disease modeling.
• Methodological guidance and biological insights from MO studies inform future research on gene families and translational applications.