Description : The focal dermal dysplasias (FFDDs) are a group of related developmental defects characterized
by bitemporal or preauricular skin lesions resembling aplasia cutis congenita. FFDD4
is characterized by isolated, preauricular skin lesions (summary by Slavotinek et
al., 2013). For a classification and a discussion of genetic heterogeneity of FFDD,
see FFDD1 (136500).;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the cytochrome P450, subfamily XXVIC, polypeptide 1 gene (CYP26C1,
608428.0001);