Ulnar-mammary syndrome (UMS) is an autosomal dominant disorder resulting from TBX3 haploinsufficiency. It typically affects limb, apocrine gland, hair, tooth and genital development and shows marked intrafamilial and interfamilial variability in phenotypic expression. We report a family (twin brothers and their father) affected with UMS because of a novel TBX3 mutation. The twin brothers showed classical features of UMS, whereas their father was mildly affected. The c.1423C>T (p.Q475*) nonsense mutation in exon 6 of the TBX3 gene identified in the patients by targeted Sanger sequencing is predicted to lead to premature termination of translation. This is the first report of a Cypriot family with UMS resulting from a novel TBX3 mutation. This report provides additional evidence in support of the rich variability in phenotypic expression, the mutational heterogeneity and ethnic diversity associated with this rare condition.
aDepartment of Clinical Genetics, Makarios Medical Centre, The Cyprus Institute of Neurology and Genetics
bDivision of Pediatric Endocrinology, Paedi Center for Specialized Pediatrics
cDepartment of Paediatrics, Medical School, St George’s University London – University of Nicosia, Nicosia, Cyprus
Correspondence to George A. Tanteles, MD, MRCPCH, DM, Department of Clinical Genetics, Makarios Medical Centre, The Cyprus Institute of Neurology and Genetics, PO Box 23462, 1683 Nicosia, Cyprus Tel: +357 223 58600; fax: +357 223 92786; e-mail: firstname.lastname@example.org
Received September 23, 2016
Accepted January 9, 2017