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Two Chinese Families with Pendred’s Syndrome—Radiological Imaging of the Ear and Molecular Analysis of the Pendrin Gene

Department of Endocrinology (A.M.L.Y., S.S.G., P.H.K.E., L.K.H.K., D.H.C.K.), Singapore General Hospital, Singapore 169608; and Department of Clinical Research (Y.Z.), Singapore General Hospital, Singapore 169608

Address all correspondence and requests for reprints to: Dr. Alice M. L. Yong, Department of Medicine, Raja Isteri Pengiran Anak Saleha Hospital, Bandar Seri Begawan 2062, BRUNEI DARUSSALAM. E-mail: alicemlyong{at}yahoo.com

Abstract

We report two families in whom the index cases satisfied the classical diagnostic criteria of Pendred’s syndrome. In family I, two siblings were deaf, and one was normal. In family II, both parents and two offspring were deaf. Computed tomography scans performed in five of six of these deaf individuals showed enlarged vestibular aqueducts in all cases, and Mondini cochlea only in family II. Affected members in family I were compound heterozygotes inheriting the paternal allele with a novel mutation S398del in exon 10 and a maternal allele with two mutations IVS13+9CG in intron 13, in addition to H723R. In family II, the mother and one child carried both the novel intronic IVS8–2AG and H723R mutations, whereas the father and index case were homozygous for the IVS8–2AG mutation. A perchlorate discharge test was positive in 50% of cases tested. In conclusion, we concur that radiological and molecular studies should be performed for confirmation of Pendred’s syndrome. We report, for the first time, a Pendred’s syndrome family in which affected members had three mutations, as well as a second family in whom the intermarriage of two Pendred’s syndrome patients resulted in Pendred’s syndrome offspring.

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