Cited2 is required in trophoblasts for correct placental capillary patterning

Area of Science:

• Developmental biology
• Genetics
• Reproductive biology

Background:

• CITED2 is a transcriptional co-factor vital for mammalian embryonic development.
• Complete CITED2 deletion leads to severe placental defects and embryonic lethality by E14.5.
• The precise role of Cited2 in placental formation remains unclear.

Purpose of the Study:

• To investigate the specific role of Cited2 in placental development using a conditional deletion approach.
• To elucidate the cellular and molecular mechanisms underlying Cited2's function in placental formation.

Main Methods:

• Conditional deletion of the Cited2 gene in specific placental cell lineages (trophectoderm and extra-embryonic mesoderm).
• Analysis of placental morphology, embryonic growth, and capillary development in mutant embryos.
• Investigation of gene expression and protein localization, including lactate transporters.

Main Results:

• Cited2 in sinusoidal trophoblast giant cells and syncytiotrophoblasts influences pericyte patterning via non-cell autonomous PDGF signaling.
• Loss of Cited2 in syncytiotrophoblasts causes mislocalization of the lactate transporter SLC16A3 (MCT4).
• Cited2 deficiency results in disorganized embryonic capillary networks and impaired nutrient transport.

Conclusions:

• Cited2 plays a critical role in placental development, affecting both vascular patterning and nutrient transport.
• Embryonic growth retardation in Cited2 null embryos is likely due to placental vascular and functional abnormalities.
• Targeting CITED2 function may offer insights into managing placental insufficiency and growth disorders.