The death-inducer obliterator 1 (Dido1) gene regulates embryonic stem cell self-renewal

Area of Science:

• Stem Cell Biology
• Molecular Biology
• Epigenetics

Background:

• Embryonic stem (ES) cells possess pluripotency, maintained by a regulatory network of master transcription factors like Oct4, Nanog, and Sox2.
• These factors define the ES cell transcriptional landscape through their target genes.

Purpose of the Study:

• To investigate the role of Dido1, a target gene of Oct4, Sox2, and Nanog, in the maintenance of mouse ES cell pluripotency.
• To elucidate the regulatory mechanisms by which Dido1 influences ES cell self-renewal and differentiation.

Main Methods:

• Depletion of Dido1 in mouse ES cells.
• Ectopic expression of Dido1.
• Chromatin immunoprecipitation to assess transcription factor binding.
• Quantitative real-time PCR to measure gene expression levels.

Main Results:

• Depletion of Dido1 induced differentiation of mouse ES cells.
• Ectopic Dido1 expression inhibited differentiation caused by leukemia inhibitory factor withdrawal.
• Nanog and Oct4 bind to the Dido1 locus, promoting its transcription.
• Dido1 targets the loci of Nanog and Oct4, positively regulating their expression.

Conclusions:

• Dido1 plays a significant role in maintaining mouse ES cell pluripotency.
• A feedback and feedforward regulatory loop involving Dido1, Nanog, and Oct4 governs ES cell self-renewal.
• Dido1 is a key component in the regulatory network essential for ES cell maintenance.