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A novel mutation in DAX1 gene causing different phenotypes in three siblings with adrenal hypoplasia congenita

L E P Calliari1, C A Longui, M N Rocha

  • 1Unidade de Endocrinologia Pediátrica, Departamento de Ciências Fisiológicas, Faculdade de Ciências Médicas, Santa Casa de São Paulo, São Paulo, SP, Brasil. caliari@uol.com.br

Genetics and Molecular Research : GMR
|June 19, 2007
PubMed

Insights

Adrenal hypoplasia congenita (AHC) is a rare genetic disorder. A novel DAX1 gene mutation causes AHC, leading to a truncated protein and varied clinical presentations in siblings.

Area of Science:

  • Genetics
  • Endocrinology
  • Pediatrics

Background:

  • Adrenal hypoplasia congenita (AHC) is a rare congenital disorder affecting adrenal gland development.
  • It can manifest in various forms, including an X-linked inheritance pattern.
  • Mutations in the DAX1 gene are a known genetic cause of AHC.

Observation:

  • This study details three siblings with AHC, presenting at different ages from neonatal to infancy.
  • Molecular analysis identified a novel mutation (Q359X) in exon 1 of the DAX1 gene.
  • This mutation results in a truncated DAX1 protein lacking the C-terminal ligand-binding domain.

Findings:

  • The identified DAX1 mutation leads to a truncated protein, impacting adrenal development.
  • Phenotypic variability was observed among siblings carrying the identical mutation.
  • Early diagnosis in one sibling facilitated the identification in others.

Implications:

  • This discovery expands the known spectrum of DAX1 mutations causing AHC.
  • Highlights the importance of genetic testing for suspected AHC cases.
  • Emphasizes the need for routine screening of family members of patients with DAX1 mutations due to variable expressivity.

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