A simple method for gene expression in endo- and ectodermal cells in mouse embryos before neural tube closure

Area of Science:

• Developmental Biology
• Molecular Biology
• Genetics

Background:

• Understanding genetic regulation during embryonic development is hindered by limited methods for gene expression in wild-type embryos.
• Introducing gene expression vectors before neural tube closure, a critical developmental stage, is particularly challenging.

Purpose of the Study:

• To present a simple and accessible technique for gene vector delivery into early mouse embryos.
• To enable the analysis of gene function in endodermal and ectodermal tissues prior to neural tube closure.

Main Methods:

• In utero injection of gene expression vectors into the amniotic cavity of mouse embryos at embryonic day 8.0 (E8.0).
• Utilized a standard optical fiber with an illuminator for vector delivery.
• Demonstrated in utero electroporation of plasmid DNA into E7.0 and E8.0 embryos.

Main Results:

• Successfully delivered retroviruses for cell labeling in diverse tissues, including the brain, spinal cord, epidermis, and digestive/respiratory organs.
• Revealed the association between Ldb1 and Neurog2 transcription factor activity in the developing mouse neocortex.
• Validated the technique for analyzing gene roles in endo- and ectodermal development.

Conclusions:

• The developed in utero injection and electroporation technique provides a simple, widely accessible method for gene manipulation in early mouse embryos.
• This technique facilitates the study of gene function during critical developmental periods before neural tube closure.
• It aids in dissecting genetic regulatory networks underlying embryonic development.