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This study details a rare microduplication on chromosome 16p13.2-p13.13, expanding knowledge of 16p duplications and associated congenital heart defects and epilepsy.

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Area of Science:

  • Genetics
  • Genomic instability
  • Chromosomal abnormalities

Background:

  • Chromosome 16p is a known unstable genomic region with complex low copy repeats.
  • Duplications in the 16p13.3-p13.13 region are associated with a distinct syndrome, often linked to the CREBBP gene.
  • Previous literature includes only one case of 16p13 duplication excluding CREBBP.

Observation:

  • This report describes a second case of 16p13 duplication, specifically a novel 16p13.2-p13.13 microduplication.
  • The patient presented with clinical features distinct from those typically associated with CREBBP involvement.

Findings:

  • The described microduplication refines the understanding of clinical manifestations in 16p duplications lacking CREBBP.
  • This case helps delineate the critical region for congenital heart defects within 16p duplications.
  • GRIN2A is proposed as a candidate gene for epilepsy in the context of these duplications.

Implications:

  • Further delineates the phenotypic spectrum of 16p microduplications.
  • Contributes to the precise mapping of genetic loci responsible for specific congenital anomalies.
  • Identifies potential candidate genes for neurological conditions associated with chromosomal rearrangements.