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Waardenburg syndrome (WS) is a genetic disorder characterized primarily by depigmentation of the skin and hair, heterochromia of the irides, sensorineural deafness, and sometimes by dystopia canthorum, and Hirschsprung disease. WS presents a large clinical and genetic heterogeneity. Four different types have been individualized and linked to 5 different genes. We report 2 cases of WS type II and 1 case of WS type IV from Lebanon and Syria. The genetic studies revealed 2 novel mutations in the MITF gene of the WS type II cases and 1 novel homozygous mutation in the EDNRB gene of the WS type IV case. This is the first molecular study of patients from the Arab world. Additional cases will enable a more detailed description of the clinical spectrum of Waardenburg syndrome in this region.

molecular syndromology

Molecular Study of Three Lebanese and Syrian Patients with Waardenburg Syndrome and Report of Novel Mutations in the &lt;i&gt;EDNRB&lt;/i&gt; and &lt;i&gt;MITF&lt;/i&gt; Genes