Deficiency of Pdap1 Results in Embryonic Lethality and Diminished Vascularization

Area of Science:

• Developmental Biology
• Molecular Biology
• Genetics

Background:

• Platelet-derived growth factor associated protein 1 (PDAP1) is involved in tumorigenesis and B lymphocyte apoptosis.
• Its role in organismal development and homeostasis is largely unknown.

Purpose of the Study:

• To investigate the physiological functions of PDAP1 in vivo using Pdap1 knockout mice.
• To understand PDAP1's role in embryonic development and vascular morphogenesis.

Main Methods:

• Generation and analysis of Pdap1 knockout mice.
• Assessment of embryonic lethality and developmental abnormalities.
• Analysis of PDAP1 expression patterns during embryogenesis.
• Comparative proteomic profiling to identify PDAP1 targets.
• Loss-of-function and gain-of-function experiments for NID1.

Main Results:

• Pdap1 knockout mice exhibit embryonic lethality by E11.5.
• Developmental abnormalities include growth retardation, pericardial effusion, hemorrhage, and impaired yolk sac/placental vascularization.
• PDAP1 is expressed in embryonic and extra-embryonic tissues.
• Nidogen-1 (NID1) was identified as a key PDAP1-repressed target.
• NID1 mediates PDAP1's effects on endothelial cell migration, invasion, and tube formation.

Conclusions:

• PDAP1 is essential for embryonic development and vascular morphogenesis.
• PDAP1 regulates vascular development, at least in part, through repression of NID1.
• NID1 plays a critical role in mediating PDAP1's function in endothelial cell behavior.