Evolution of latent hypoparathyroidism in familial 22q11 deletion syndrome

Bettina F. Cuneo*, Deborah A. Driscoll, Samuel S. Gidding, Craig B. Langman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Latent hypoparathyroidism (LHP), the inability to increase midmolecular parathyroid hormone levels appropriately during a hypocalcemic challenge, was reported previously in an asymptomatic woman with tetralogy of Fallot. This woman's fourth child died with DiGeorge anomaly. Seven years later, we restudied the index patient with LHP and evaluated three generations of her family for parathyroid dysfunction, cardiac abnormalities, and del 22(q11). Deletions were found in six relatives, three with conotruncal cardiac defects and three with a structurally normal heart. We found significant transgenerational noncardiac phenotypic variability, including learning difficulties, dysmorphic facial appearance, and psychiatric illness. A spectrum of parathyroid gland dysfunction associated with the del 22(q11) was seen, ranging from hypocalcemic hypoparathyroidism to normocalcemia with abnormally low basal intact parathyroid hormone (iPTH) levels. In addition, LHP found in the index patient 7 years ago had evolved to frank hypocalcemic hypoparathyroidism. In this family, which is the largest family with 22q11 deletions studied to date, parathyroid gland dysfunction evolved over time. We suggest that the calcium parathyroid hormone axis of unrelated patients with dei 22(q11) be followed closely for the development of hypocalcemic hypoparathyroidism.

Original languageEnglish (US)
Pages (from-to)50-55
Number of pages6
JournalAmerican Journal of Medical Genetics
Volume69
Issue number1
DOIs
StatePublished - Mar 3 1997

Keywords

  • 22q11 deletion
  • DiGeorge anomaly
  • chromosomes, human, pair 22
  • heart defects, congenital
  • hypocalcemic hypoparathyroidism

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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