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Inverted duplication deletion of 8P: characterization by standard cytogenetic and SNP array analyses.

Adriana Sireteanu1, Elena Braha1, Roxana Popescu1

  • 1Discipline of Medical Genetics, University of Medicine and Pharmacy "Grigore T. Popa", lasi.

Revista Medico-Chirurgicala a Societatii De Medici Si Naturalisti Din Iasi
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Inverted duplication deletion of chromosome 8p is a rare rearrangement. This study details a case, identifying non-allelic homologous recombination between olfactory receptor gene clusters as the likely cause.

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Area of Science:

  • Genetics
  • Genomics
  • Developmental Biology

Background:

  • Recurrent chromosomal rearrangements like inverted 8p duplication deletions often result from non-allelic homologous recombination (NAHR).
  • NAHR typically occurs during maternal meiosis between olfactory receptor (OR) gene clusters.
  • A common paracentric inversion polymorphism in 8p23.1 may predispose individuals to meiotic misalignment and NAHR.

Observation:

  • A 4-year-old female presented with dysmorphic features, pectus excavatum, hypertonia, and severe developmental delay.
  • Brain imaging revealed agenesis of the corpus callosum.
  • Conventional cytogenetics showed extra material on chromosome 8, while SNP array precisely mapped a 31.3 Mb duplication (8p23.1-8p11.1) and a 6.8 Mb terminal deletion (8p23.3-8p23.1).

Findings:

  • The patient was diagnosed with an inverted duplication deletion of 8p.
  • SNP array analysis identified a region of disomy between the deletion and duplication.
  • The precise breakpoint mapping supports NAHR between segmental duplications as the underlying mechanism.

Implications:

  • This case highlights the importance of advanced molecular techniques like SNP array for characterizing complex chromosomal abnormalities.
  • Understanding the mechanism of NAHR in 8p rearrangements can aid in genetic counseling and diagnosis.
  • Further research into the role of inversion polymorphisms in NAHR is warranted.