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Partial 1q Duplications and Associated Phenotype.

Marcos L M Morris1, José E Baroneza2, Patricia Teixeira1

  • 1Programa de Pós-graduação em Ciências da Saúde, São Paulo, Brazil.

Molecular Syndromology
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PubMed
Summary
This summary is machine-generated.

Rare distal duplications of chromosome 1 long arm (1q) are challenging to define. This study characterizes two new cases, aiding in understanding partial distal trisomy 1q syndrome.

Keywords:
Array CGHDistal partial duplication 1qDuplication 1q41q43Duplication 1q42.13FISH

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Area of Science:

  • Genetics
  • Human Genetics
  • Chromosomal Abnormalities

Background:

  • Duplications of chromosome 1 long arm (1q) are infrequent genetic events.
  • Distal 1q duplications are typically observed as pure trisomy or unbalanced translocations.
  • Limited case data for pure distal 1q duplications hinders the definition of a distinct syndrome.

Purpose of the Study:

  • To report and characterize two new cases of overlapping distal 1q duplications.
  • To contribute to the delineation of a partial distal trisomy 1q syndrome.
  • To enhance the understanding of genetic variations in distal 1q duplication syndrome.

Main Methods:

  • G-banding for initial detection of 1q duplications.
  • Array comparative genomic hybridization (CGH) for precise characterization of duplicated segments.
  • Fluorescence in situ hybridization (FISH) to confirm duplication, exclude other chromosomal involvement, and determine orientation.

Main Results:

  • Two patients with overlapping distal 1q duplications were identified.
  • Patient 1: Mild phenotype with a 22.5 Mb duplication in the 1q41q43 region.
  • Patient 2: Presented with a 21.5 Mb inverted duplication (1q42.13qter), one of the smallest reported distal 1q duplications.

Conclusions:

  • The characterization of these two cases, particularly the smallest inverted duplication, refines the understanding of distal 1q duplication syndrome.
  • Array CGH and FISH are crucial for accurate genetic assessment of these rare duplications.
  • Further case studies are needed to fully delineate the phenotypic spectrum associated with distal 1q duplications.