Gene transfer into intact vertebrate embryos.

Area of Science:

• Developmental Biology
• Molecular Biology
• Gene Delivery

Background:

• In vivo transfection of vertebrate embryos is crucial for studying gene function during development.
• Efficient and non-toxic gene delivery methods are needed for precise temporal control.

Purpose of the Study:

• To evaluate the efficacy of a cationic lipid, dioctadecylamidoglycyl spermine (DOGS), for in vivo gene transfection in intact chick embryos.
• To assess the expression levels of chloramphenicol acetyl transferase (CAT) under various promoter sequences.
• To demonstrate the regulatability of introduced gene promoters by transacting factors.

Main Methods:

• Intact chick embryos at 40 hours of incubation were transfected in vivo using chimeric vectors and DOGS.
• Chloramphenicol acetyl transferase (CAT) activity was measured 48 hours post-transfection.
• Co-transfection experiments were performed using vectors with AP-1 and cAMP response elements.

Main Results:

• Dioctadecylamidoglycyl spermine (DOGS) showed no significant toxicity to embryonic development.
• Chimeric vectors containing the AP-1 response element linked to CAT (TRE-tk-CAT) yielded high and consistent CAT expression.
• Co-transfection experiments confirmed that introduced gene promoters can be regulated by their respective transacting factors.

Conclusions:

• In vivo transfection using DOGS is a safe and effective method for gene delivery into intact chick embryos.
• The TRE-tk-CAT construct provides robust gene expression, suitable for developmental studies.
• This technique offers a versatile tool for introducing genes into vertebrate embryos at specific developmental stages.