The function of tcf3 in medaka embryos: efficient knockdown with pePNAs

Area of Science:

• Developmental Biology
• Molecular Biology
• Genetics

Background:

• Antisense molecules like morpholino oligonucleotides are effective for in vivo gene inactivation.
• Phosphonic ester modified peptide nucleic acids (PNA) were previously developed for loss-of-function studies in medaka embryos.

Purpose of the Study:

• To test novel PNA backbone modifications for efficient knockdown of the medaka tcf3 gene.
• To investigate the role of medaka Tcf3 in embryonic eye development.

Main Methods:

• Utilized novel side chain modified PNA molecules for gene knockdown experiments.
• Analyzed eye development phenotypes in medaka embryos following tcf3 gene inactivation.
• Investigated interactions between Tcf3 and Groucho/Tle co-repressor proteins.

Main Results:

• Medaka tcf3 gene inactivation significantly affected embryonic eye development, causing size reduction and anophthalmia.
• Tcf3 function in eye development is dependent on interactions with Groucho/Tle co-repressors.
• Side chain modified PNAs demonstrated knockdown efficiency comparable to morpholino oligonucleotides.

Conclusions:

• The medaka tcf3 gene is critical for anterior development and eye formation, functioning similarly to zebrafish paralogs.
• Novel PNA modifications offer a viable alternative to morpholino oligonucleotides for in vivo gene knockdown.
• Tcf3, in conjunction with Groucho/Tle proteins, plays a crucial role in medaka eye development.