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10p12.1 deletion: HDR phenotype without DGS2 features.

Elisa Benetti1, Luisa Murer, Andrea Bordugo

  • 1Pediatric Nephrology, Dialysis and Transplantation Unit, Department of Pediatrics, University of Padua, Via Giustiniani, 3, 35128 Padua, Italy. elisabene@libero.it

Experimental and Molecular Pathology
|November 22, 2008
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Summary

A girl with a 10p deletion syndrome experienced Hypoparathyroidism, sensorineural Deafness, and Renal dysplasia (HDR) but not DiGeorge syndrome 2. This case highlights the complexity of GATA3 gene deletions and HDR syndrome.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Pediatrics

Background:

  • The GATA3 gene is crucial for embryonic development in various organs and tissues.
  • Mutations in GATA3 are linked to Hypoparathyroidism, sensorineural Deafness, and Renal dysplasia syndrome (HDR).

Observation:

  • A case report of a female infant with a terminal deletion on the short arm of chromosome 10 (10p12.1-pter).
  • This deletion encompassed the HDR locus and DiGeorge critical region 2 (DGCR2).
  • The patient presented with HDR phenotype, including chronic renal failure, sensorineural hearing loss, dysmorphic features, and psychomotor delay, but lacked DiGeorge syndrome 2 features.

Findings:

  • Karyotyping confirmed a 46,XX,del(10)(p12.1-pter) karyotype.
  • Real-time PCR analysis revealed a hemizygous deletion of the GATA3 gene.
  • The patient underwent successful renal transplantation at age 11.

Implications:

  • This is the first reported case of a large 10p deletion involving DGCR2 presenting with HDR phenotype but not DGS2.
  • The findings suggest that the pathogenesis of HDR syndrome may involve locus heterogeneity.
  • Further research is needed to elucidate the complex mechanisms underlying GATA3-related disorders.