SOX2 haploinsufficiency is associated with slow progressing hypothalamo-pituitary tumours

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Kyriaki S Alatzoglou1, Cynthia L Andoniadou, Daniel Kelberman

  • 1Developmental Endocrinology Research Group, Clinical and Molecular Genetics Unit, Institute of Child Health, University College London, London, UK.

Human Mutation
|September 16, 2011
PubMed

Insights

SOX2 haploinsufficiency, a condition affecting the SOX2 gene, is linked to early-onset pituitary tumors in two patients. This finding suggests a congenital cause and implicates SOX2 in pituitary tumor development.

Area of Science:

  • Developmental Biology
  • Genetics
  • Endocrinology

Background:

  • SOX2 is a crucial transcription factor for early development and stem cell maintenance.
  • SOX2 mutations are associated with hypopituitarism and ocular abnormalities.
  • The role of SOX2 in pituitary gland development is an emerging area of research.

Observation:

  • Two unrelated patients with SOX2 haploinsufficiency presented with early-onset, nonprogressive pituitary tumors.
  • One patient had a heterozygous gene deletion, and the other had a novel truncating mutation (c.143TC>AA/p.F48X).
  • Pituitary tumors in these cases suggest a congenital etiology related to SOX2 deficiency.

Findings:

  • The truncating SOX2 mutation led to significant loss of function and impaired nuclear localization.
  • The mutant SOX2 protein failed to repress beta-catenin transcriptional activity in vitro.
  • This study provides the first evidence linking SOX2 haploinsufficiency to the development of specific pituitary tumors.

Implications:

  • SOX2 haploinsufficiency is implicated in the pathogenesis of early-onset pituitary tumors.
  • The Wnt signaling pathway may be a key mediator in SOX2-related pituitary tumor formation.
  • These findings expand the clinical spectrum associated with SOX2 haploinsufficiency and offer insights into pituitary tumorigenesis.

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