title: Compound heterozygous mutations (p.T561M and c.2422delT) in the TPO gene associated with congenital hypothyroidism.
abstract: BACKGROUND
  The objective of the study was to determine the genetic basis of goitrous congenital hypothyroidism (GCH) in Chinese siblings.
  
  
  METHODS
  The proband and her younger brother with GCH were enrolled for molecular analysis of the dual oxidase 2 (DUOX2), dual oxidase maturation factor 2 (DUOXA2), and thyroid peroxidase (TPO) genes. Mutation screening was performed by Sanger sequencing the fragments amplified from genomic DNA. The detected mutations were verified among the close relatives of the patients and 105 controls. All participants underwent clinical examination and laboratory tests.
  
  
  RESULTS
  Analysis of the TPO gene revealed two heterozygous mutations, the frameshift mutation c.2422delT in the exon14 of the TPO gene, that has been reported previously, and a novel missense mutation c.1682C>T (p.T561M) in the exon10 of the TPO gene. Nine family members of the patients were enrolled for mutation screening. The patients' parents and grandfathers harbored a single heterozygous mutation. The germline mutations from this family were consistent with an autosomal recessive inheritance pattern. No mutations in the DUOXA2 and DUOX2 genes were observed.
  
  
  CONCLUSIONS
  The inactivating mutations (c.2422delT and p.T561M) in the TPO gene were identified in the Chinese siblings with GCH. The compound heterozygous mutations can cause GCH.
authors.forename: Shao-Gang
authors.initials: SG
authors.lastname: Ma
authors.forename: Xiao
authors.initials: X
authors.lastname: Zheng
authors.forename: Ya-Li
authors.initials: YL
authors.lastname: Qiu
authors.forename: Man-Li
authors.initials: ML
authors.lastname: Guo
authors.forename: Xiao-Juan
authors.initials: XJ
authors.lastname: Shao
mesh_terms: D000328:Adult; D001324:Autoantigens / Q000235:genetics*; D003409:Congenital Hypothyroidism / Q000235:genetics* / Q000473:pathology*; D000074623:Dual Oxidases; D005260:Female; D006579:Heterozygote; D006801:Humans; D007223:Infant; D007453:Iodide Peroxidase / Q000235:genetics*; D033862:Iron-Binding Proteins / Q000235:genetics*; D008297:Male; D008565:Membrane Proteins / Q000235:genetics; D008875:Middle Aged; D009154:Mutation / Q000235:genetics*; D019255:NADPH Oxidases / Q000235:genetics; D010375:Pedigree; D011379:Prognosis; D055815:Young Adult
chemical_list: D001324:Autoantigens; C513411:DUOXA2 protein, human; D033862:Iron-Binding Proteins; D008565:Membrane Proteins; D000074623:Dual Oxidases; C056658:TPO protein, human; D007453:Iodide Peroxidase; D019255:NADPH Oxidases; C431515:DUOX2 protein, human