Generation of Osr1 conditional mutant mice.

Area of Science:

• Developmental Biology
• Genetics
• Molecular Biology

Background:

• Odd-skipped related 1 (Osr1) is a transcription factor crucial for mouse embryogenesis.
• Osr1 plays roles in heart and kidney development, but null mutants exhibit embryonic lethality, limiting research.
• Investigating Osr1's broader developmental functions requires a method to bypass early lethality.

Purpose of the Study:

• To generate conditional Osr1 mutant mice to enable tissue-specific functional analysis.
• To overcome the embryonic lethality associated with Osr1 null mutations.
• To facilitate the study of Osr1's roles in diverse embryonic and postnatal developmental processes.

Main Methods:

• Generation of Osr1 conditional mutant mice with loxP sites flanking exon 2 (Osr1(fneo/fneo)).
• Utilized EIIa-Cre transgenic mice for germline deletion of the floxed exon.
• Phenotypic analysis of mice homozygous for the Osr1 exon 2 deletion.

Main Results:

• Osr1(fneo/fneo) mice were normal and fertile, indicating successful conditional allele generation.
• Germline deletion of Osr1 exon 2 resulted in phenotypes identical to Osr1 null mutants.
• The conditional system effectively recapitulated Osr1 null phenotypes, confirming its utility.

Conclusions:

• Conditional Osr1 mutant mice provide a valuable tool for studying gene function.
• This model system overcomes embryonic lethality, allowing for detailed investigation of Osr1's roles in multiple tissues.
• The Osr1(fneo) conditional mice are essential for understanding Osr1's contribution to embryonic and postnatal development.