Bi-allelic Loss-of-Function Mutations in the NPR-C Receptor Result in Enhanced Growth and Connective Tissue...

Area of Science:

• Genetics
• Endocrinology
• Molecular Biology

Background:

• The natriuretic peptide signaling pathway regulates cellular processes like bone growth.
• Mutations in NPR-B and CNP are linked to stature variations.
• The role of NPR-C in linear bone growth was previously unclear.

Observation:

• Four individuals from three families presented with tall stature, long digits, and extra epiphyses.
• Two families exhibited aortic dilatation.
• Bi-allelic loss-of-function mutations in NPR3 were identified in affected individuals.

Findings:

• Missense and nonsense mutations in NPR3 caused NPR-C receptor dysfunction.
• Defective NPR-C led to reduced natriuretic peptide clearance.
• This resulted in increased NPR-A/B receptor signaling activity.

Implications:

• NPR3 loss-of-function mutations cause a phenotype of enhanced bone growth and cardiovascular abnormalities.
• NPR-C is a key regulator of linear bone growth.
• Understanding NPR-C function offers insights into skeletal and cardiovascular development.