A T-to-A mutation in Pcsk5 (proprotein convertase subtilisin/kexin type 5) was identified in an ENU screen for recessive cardiovascular development phenotypes in Dr. Cecilia Lo's laboratory, NHLBI Cardiovascular Development Consortium (CvDC). It was recovered from G1 sperm and associated with the phenotype described here. Because G1 sperm were cryopreserved, additional incidental mutations are also segregating in this strain.
Homozygotes demonstrate heterotaxia with congenital heart diseases including dextrocardia/mesocardia, transposition of the great arteries (TGA), or double outlet right ventricle (DORV) and atrioventricular septal defect (AVSD). Immotile, hyperkinetic and dyskinetic airway cilia are also seen.