Spatiotemporal control of embryonic gene expression using caged morpholinos.

Area of Science:

• Developmental Biology
• Chemical Biology
• Genomics

Background:

• Embryonic development requires precise spatial and temporal control of gene expression.
• Understanding gene function in pattern formation necessitates methods for targeted gene perturbation.

Purpose of the Study:

• To describe the design and assembly of caged morpholino (cMO) oligonucleotides.
• To detail experimental protocols for cMO microinjection and photoactivation in zebrafish embryos.
• To present methods for preparing and using caged fluorescein dextran (cFD) for cell labeling.

Main Methods:

• Chemical synthesis of caged morpholino oligonucleotides from commercial reagents.
• Microinjection of cMOs and caged fluorescein dextran into zebrafish embryos.
• Photoactivation of cMOs for gene photo-inactivation and cFD for cell tracking.

Main Results:

• Established protocols for cMO design, assembly, and application.
• Demonstrated spatiotemporal control of gene inactivation using photoactivatable cMOs.
• Successfully labeled photoactivated cells using cFD.

Conclusions:

• Caged morpholino oligonucleotides are effective tools for functional genomic studies in zebrafish.
• This technique allows for precise investigation of gene function during embryonic development.
• The described protocols are adaptable for use in other model organisms.