Novel NECTIN4 Mutations in Ectodermal Dysplasia Syndactyly Syndrome in Two Families.

BACKGROUND

Ectodermal dysplasia-syndactyly syndrome (EDSS) is a rare form of ectodermal dysplasia caused by biallelic mutations in NECTIN4 (PVRL4) gene.

OBJECTIVES

To identify new and rare mutations of the NECTIN4 gene in two unrelated families with EDSS.

METHODS

Six patients from two unrelated families were diagnosed with EDSS. Next generation sequencing and Sanger sequencing were performed on DNA extracted from peripheral blood from affected and unaffected individuals from the families. We performed a literature search to identify previously reported cases of EDSS.

RESULTS

A homozygous c.680A>G p.His227Arg mutation in NECTIN4 was found in five affected members of both families. One patient was found to be compound heterozygous for the latter mutation and for another novel missense mutation in NECTIN4 (c.79+1G>A). Both mutations affect the extracellular domain of nectin-4. A literature search identified only 13 reported families affected by this rare disorder.

CONCLUSIONS

We described two families with six affected members presenting with EDSS caused by two novel NECTIN4 mutations. We also reviewed the current available data on EDSS in the medical literature.