Lysine-specific demethylase 1 regulates the embryonic transcriptome and CoREST stability

Area of Science:

• Epigenetics
• Developmental Biology
• Molecular Biology

Background:

• Lysine-specific demethylase 1 (LSD1) is a key epigenetic regulator involved in histone modification.
• LSD1 functions within a complex including CoREST and histone deacetylases (HDACs).
• LSD1 is essential for mouse embryonic development beyond embryonic day 6.5.

Purpose of the Study:

• To investigate the role of LSD1 during early mouse embryogenesis.
• To analyze the effects of LSD1 loss-of-function on embryonic development and gene expression.

Main Methods:

• Generation of loss-of-function gene trap mice and conditional knockout embryonic stem (ES) cells.
• Analysis of LSD1 expression in postimplantation embryos.
• Conditional deletion of LSD1 in mouse ES cells to assess biochemical and molecular consequences.

Main Results:

• LSD1 expression is restricted to the epiblast in early embryos.
• LSD1 deletion in ES cells reduced CoREST and HDAC activity, increasing H3-Lys56 acetylation.
• Loss of LSD1 led to aberrant expression of 588 genes, including developmental regulators like brachyury and Hox genes.

Conclusions:

• LSD1 is essential for regulating the expression and timing of key developmental genes during early embryogenesis.
• The LSD1/CoREST/HDAC complex plays a critical role in controlling gene expression patterns necessary for embryonic development.
• Disruption of LSD1 function results in widespread transcriptional dysregulation with significant implications for developmental processes.