Protein dachsous homolog 1, also known as protocadherin-16 (PCDH16) or cadherin-19 (CDH19) or cadherin-25 (CDH25) or fibroblast cadherin-1 (FIB1), is a protein that in humans is encoded by the DCHS1 gene.

This gene is a member of the cadherin superfamily whose members encode calcium-dependent cell-cell adhesion molecules. The encoded protein has a signal peptide, 27 cadherin repeat domains and a unique cytoplasmic region. This particular cadherin family member is expressed in fibroblasts but not in melanocytes or keratinocytes. The cell-cell adhesion of fibroblasts is thought to be necessary for wound healing.

Mutations in this gene have been shown to cause mitral valve prolapse

This article incorporates text from the United States National Library of Medicine, which is in the public domain.