[Identification of two heterozygous mutations in the SLC26A4/PDS gene in a family with Pendred-syndrome].
BACKGROUND
Pendred-syndrome is an autosomal recessive disease that is classically characterised by sensorineural hearing loss and enlargement of the thyroid gland. The gene SLC26A4/PDS for the pendred-syndrome has been localised by linkage analysis on chromosome 7q31. This protein is expressed in the inner ear, thyroid gland, kidney and placenta. Functional analysis in Xenopus laevis oocytes revealed that it acts as an iodide/chloride and chloride/formate exchanger.


METHODS
Each of the exons and flanking splice regions of the SLC26A4/PDS gene was analysed by direct sequencing.


RESULTS
In the involved family two heterozygous mutations could be detected which results by combination in hearing loss and deafness.


CONCLUSIONS
By evidences of familial background in hearing loss and thyroid disorder it is reasonable to analyse the PDS gene for mutation to have early the possibility for medical care of linguistic development through hearing aid or CI-implantation.
Birkenhäger
R
R
Universitätsklinik für Hals-, Nasen- und Ohrenheilkunde und Poliklinik, Universitätsklinikum Freiburg. birkenhaeger@hno.ukl.uni-freiburg.de
Knapp
F B
FB
Klenzner
T
T
Aschendorff
A
A
Schipper
J
J
D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D002874:Chromosome Mapping; D002897:Chromosomes, Human, Pair 7; D003051:Cochlea / Q000002:abnormalities*; D019929:Cochlear Implantation; D004252:DNA Mutational Analysis; D003638:Deafness / Q000175:diagnosis / Q000235:genetics* / Q000534:rehabilitation; D005091:Exons / Q000235:genetics; D005260:Female; D005500:Follow-Up Studies; D005808:Genes, Recessive / Q000235:genetics; D006580:Genetic Carrier Screening; D006042:Goiter / Q000175:diagnosis / Q000235:genetics*; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis / Q000235:genetics* / Q000534:rehabilitation; D006801:Humans; D008297:Male; D026901:Membrane Transport Proteins / Q000235:genetics*; D010375:Pedigree; D010641:Phenotype; D000076988:Sulfate Transporters; D013577:Syndrome; D013701:Temporal Bone / Q000002:abnormalities*
D026901:Membrane Transport Proteins; C085609:SLC26A4 protein, human; D000076988:Sulfate Transporters