Duplication of the ALDH1A2 gene in association with pentalogy of Cantrell: a case report

INTRODUCTION: The pentalogy of Cantrell is rare clustering of congenital defects, first described by Cantrell and colleagues in 1958. The exact pathogenesis for the pentalogy remains unknown and no specific genetic abnormalities have been correlated; however, a failure of embryogenesis has been suspected. The microduplication of chromosome 15q21.3 (57,529,846 to 58,949,448) found in our patient with pentalogy of Cantrell has not been described previously. CASE PRESENTATION: We describe a case of a newborn Caucasian male baby with prenatally diagnosed pentalogy of Cantrell and a novel maternally inherited copy number variant detected by chromosome microarray analysis. Among the genes within the duplicated region is ALDH1A2, encoding the enzyme retinaldehyde dehydrogenase type 2. CONCLUSION: Vital for retinoic acid synthesis during early development, ALDH1A2 has previously been demonstrated in animal models to have a strong association with congenital heart disease and diaphragmatic hernia, two key elements comprising pentalogy of Cantrell. It is possible that perturbation of retinoic acid levels during development secondary to this microduplication could underlie the pathology observed in the current case of pentalogy of Cantrell.