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A complex 6p25 rearrangement in a child with multiple epiphyseal dysplasia

Jirair K Bedoyan1, Marci M Lesperance, Todd Ackley

  • 1Department of Pediatrics, The University of Michigan Medical School, Ann Arbor, USA. sarahbed@med.umich.edu

American Journal of Medical Genetics. Part A
|January 5, 2011
PubMed

Insights

This study details a complex genomic rearrangement in a child with multiple health issues, including developmental delay and skeletal anomalies. Advanced array technologies identified specific deletions and gene disruptions on chromosome 6p25.

Area of Science:

  • Genetics
  • Genomics
  • Human Disease

Background:

  • Genomic rearrangements are increasingly implicated in human diseases.
  • Understanding complex rearrangements is crucial for diagnosing genetic disorders.

Observation:

  • An 11-year-old child presented with myopia, Duane retraction syndrome, hearing loss, skeletal anomalies, and developmental delay.
  • A complex genomic rearrangement at chromosome 6p25 was identified in the patient.

Findings:

  • Oligonucleotide-based comparative genomic hybridization arrays (aCGH) and SNP arrays revealed a complex rearrangement.
  • This included a ~2.21 Mb interstitial deletion, a ~240 kb terminal deletion, and a 70-80 kb region with copy number maintenance.
  • The interstitial deletion encompasses genes including FOXQ1, FOXF2, and FOXC1. A homozygous loss of the 5' end of DUSP22 was also detected.

Implications:

  • The identified genomic alterations, particularly the homozygous DUSP22 loss, may contribute to the patient's phenotype.
  • The study highlights the utility of high-resolution aCGH and SNP arrays for complex rearrangement detection.
  • The identified rearrangement mechanism appears distinct from previously described replication-based errors.

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