title: Congenital goitrous hypothyroidism: mutation analysis in the thyroid peroxidase gene.
abstract: BACKGROUND
  Iodide organification defect (IOD) is characterized by a reduced ability of the thyroid gland to retain iodide resulting in hypothyroidism. Mutations in thyroid peroxidase (TPO) gene appear to be the most common cause of IOD and are commonly inherited in an autosomal recessive fashion. The TPO gene is located on the chromosome 2p25. It comprises 17 exons, covers approximately 150 kb of genomic DNA and codes 933 amino acids.
  
  
  OBJECTIVE
  In this study, we characterize the clinical and molecular basis of seven patients from four unrelated families with congenital hypothyroidism (CH) because of IOD.
  
  
  METHODS
  All patients underwent clinical, biochemical and imaging evaluation. The promoter and the complete coding regions of the human TPO along with the flanking intronic regions were analysed by single-strand conformation polymorphism analysis and direct DNA sequencing. Segregation analysis of mutations was carried out, and the effect of the novel missense identified mutations was investigated by 'in silico' studies.
  
  
  RESULTS
  All subjects had congenital and persistent primary hypothyroidism. Three novel mutations: c.796C>T [p.Q266X], c.1784G>A [p.R595K] and c.2000G>A [p.G667D] and a previously reported mutation: c.1186_1187insGGCC [p.R396fsX472] have been identified. Four patients were compound heterozygous for p.R396fsX472/p.R595K mutations, two patients were homozygous for p.R595K, and the remaining patient was a compound heterozygous for p.Q266X/p.G667D.
  
  
  CONCLUSIONS
  Our findings confirm the genetic heterogeneity of TPO defects and the importance of the implementation of molecular studies to determinate the aetiology of the CH with dyshormonogenesis.
authors: Laboratorio de Biología Molecular, Cátedra de Genética y Biología Molecular, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina.
authors: Fiorella S
authors: FS
authors: Belforte
authors: Mirta B
authors: MB
authors: Miras
authors: María C
authors: MC
authors: Olcese
authors: Gabriela
authors: G
authors: Sobrero
authors: Graciela
authors: G
authors: Testa
authors: Liliana
authors: L
authors: Muñoz
authors: Laura
authors: L
authors: Gruñeiro-Papendieck
authors: Ana
authors: A
authors: Chiesa
authors: Rogelio
authors: R
authors: González-Sarmiento
authors: Héctor M
authors: HM
authors: Targovnik
authors: Carina M
authors: CM
authors: Rivolta
mesh_terms: D000293:Adolescent; D002648:Child; D003409:Congenital Hypothyroidism / Q000235:genetics*; D004252:DNA Mutational Analysis; D005260:Female; D006801:Humans; D007453:Iodide Peroxidase / Q000235:genetics*; D008297:Male; D009154:Mutation
chemical_list: D007453:Iodide Peroxidase