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Editor—The split hand/split foot malformation (SHFM, MIM 183600) is a central reduction defect of the hands and feet and occurs both as an isolated malformation and as part of several syndromes including the EEC syndrome (MIM 129900). We report on a 2 year old boy with SHFM associated with features of ectodermal hypoplasia, a submucous cleft palate, congenital vertical talus, malformations of the middle ear, profound sensorineural hearing loss resulting from Mondini dysplasia, and a de novo deletion of the paternal chromosome 7q21.1-q21.3. This patient with syndromic SHFM represents a case of atypical EEC syndrome, but also displays abnormalities previously not associated with SHFM or EEC syndrome.
The classical features of the autosomal dominant inherited EEC syndrome are ectrodactyly, ectodermal dysplasia, and clefting of the lip/palate. In most patients, there are additional anomalies typically affecting the urogenital and lacrimal systems.1 ,2 Some patients also have dysmorphic facies, a tendency to infectious disease, endocrine disorders, and mental retardation. This phenotypic variability has become increasingly apparent over the last 15 years3 ,4 and numerous related and overlapping syndromes have been delineated by many investigators.5 In an attempt to clarify classification, major and minor criteria for the diagnosis of EEC syndrome have been elaborated.3 ,4
Dominant inheritance of EEC has been documented in several large multigenerational families.6 At least 15 patients have been reported to have cytogenetic abnormalities of chromosome 7q21.2-7q22.1, including nine patients with interstitial deletions.7-9 In addition, mutations in the gene encoding the transactivation factor p63 on chromosome 3q27 have been identified in familial and sporadic cases of EEC syndrome.10 A third locus was mapped to chromosome 19q,11 further delineating the genetic heterogeneity of this syndrome. The reason for the phenotypic heterogeneity in EEC syndrome patients with 7q …