Pendred syndrome among patients with congenital hypothyroidism detected by neonatalscreening: identification of two novel PDS/SLC26A4 mutations

  • Karolina Banghova
  • Eva Al Taji
  • Ondrej Cinek
  • Dana Novotna
  • Radka Pourova
  • Jirina Zapletalova
  • Olga Hnikova
  • Jan Lebl
Original Paper

Abstract

Pendred syndrome is an autosomal recessive disorder characterised by sensorineural hearing loss and thyroid dyshormonogenesis. It is caused by mutations in the PDS/SLC26A4 gene (OMIM 605646) encoding for pendrin. Hypothyroidism in Pendred syndrome can be—although rarely—present from birth and therefore diagnosed by neonatal screening. The aim of our study was to identify patients with Pendred syndrome among a historical cohort of patients with congenital hypothyroidism (CH) identified by neonatal screening, and to find their mutations in the PDS/SLC26A4 gene. We investigated 197 Czech Caucasian children with CH detected by the neonatal screening between the years 1985 and 2005. The clinical diagnosis of Pendred syndrome was based on the laboratory and sonographic signs of thyroid dyshormonogenesis in association with sensorineural hearing loss. In subjects clinically diagnosed with Pendred syndrome, we sequenced all exons and exon-intron boundaries of the PDS/SLC26A4 gene. Hearing loss was present in 10/197 children with screening-detected CH. Of these, three fulfilled the diagnostic criteria of Pendred syndrome. Two patients were compound heterozygotes for PDS/SLC26A4 mutations: patient 1 carried c.2089+1G>A / c.3G>C and patient 2 carried p.Tyr530His / p.Val422Asp. Two of the four identified mutations were novel (c.3G>C in patient 1 and p.Val422Asp in patient 2). The third patient was free of mutations in the PDS/SLC26A4 gene, representing a phenocopy. In conclusion, our results indicate the rarity of Pendred syndrome as a cause of CH. The identification of two novel mutations expands the spectrum of mutations in the PDS/SLC26A4 gene and emphasizes their marked allelic heterogeneity.

Keywords

Congenital hypothyroidism PDS SLC26A4 Pendrin Sensorineural hearing loss 

Abbreviations

CH

Congenital hypothyroidism

PDS/SLC26A4

Gene for pendrin

EVA

Enlarged vestibular aqueduct

OAE

Otoacoustic emissions

ABR

Auditory brainstem response

tT4

Total thyroxine

TSH

Thyrotropin

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Karolina Banghova
    • 1
  • Eva Al Taji
    • 2
  • Ondrej Cinek
    • 1
    • 5
  • Dana Novotna
    • 3
  • Radka Pourova
    • 1
  • Jirina Zapletalova
    • 4
  • Olga Hnikova
    • 2
  • Jan Lebl
    • 1
  1. 1.Department of Paediatrics, Second Faculty of MedicineCharles University in PraguePragueCzech Republic
  2. 2.Department of Paediatrics, Third Faculty of MedicineCharles University in PraguePragueCzech Republic
  3. 3.Second Department of PaediatricsUniversity HospitalBrnoCzech Republic
  4. 4.Department of Paediatrics, Faculty of MedicinePalacky UniversityOlomoucCzech Republic
  5. 5.Department of PaediatricsUniversity Hospital MotolPragueCzech Republic

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