Fluorescent dATP for DNA Synthesis In Vivo

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Fluorescent nucleoside triphosphates are essential tools for studying DNA synthesis.
• Their application in living animals remains largely unexplored.
• Developing non-toxic, efficiently incorporated probes is crucial for in vivo studies.

Purpose of the Study:

• To synthesize and characterize novel fluorescent deaza-dATP derivatives for in vivo DNA synthesis visualization.
• To evaluate the incorporation, toxicity, and kinetics of these probes in live organisms.
• To identify the optimal fluorescent probe for real-time imaging of DNA replication and chromosome segregation.

Main Methods:

• Synthesis of tetramethyl rhodamine (TAMRA), cyanine (Cy3), and boron-dipyrromethene (BODIPY) labeled 7-deaza-2 eal-time-deoxyadenosine-5 eal-time-triphosphate (dATP) derivatives.
• Microinjection of synthesized compounds into zebrafish embryos and Caenorhabditis elegans.
• Assessment of DNA incorporation, embryonic toxicity, and fluorescence kinetics using microscopy.

Main Results:

• All synthesized fluorescent dATP derivatives were incorporated into the DNA of dividing cells in zebrafish embryos.
• Embryonic toxicity varied significantly among the tested compounds.
• TAMRA-dATP demonstrated superior performance with high brightness, low toxicity, and rapid kinetics in both zebrafish and C. elegans.
• TAMRA-dATP enabled unprecedented real-time visualization of DNA replication and chromosome segregation in vivo.

Conclusions:

• Fluorescent deaza-dATP derivatives can be effectively incorporated into DNA in living animals.
• TAMRA-dATP is a highly promising probe for in vivo studies of DNA replication and chromosome dynamics.
• This work opens new avenues for real-time molecular and genetic analyses in live organisms.