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Mosaic structural variation in children with developmental disorders.

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This summary is machine-generated.

Structural mosaicism, large genetic changes in some cells, is significantly more common in children with developmental disorders than in healthy children. This study quantifies its role as a cause of these conditions.

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Area of Science:

  • Human Genetics
  • Developmental Biology
  • Genomic Medicine

Background:

  • Mosaic structural abnormalities are genetic alterations present in a subset of cells.
  • Their frequency in healthy children is not well understood, hindering the interpretation of their role in developmental disorders.

Purpose of the Study:

  • To determine the frequency of large-scale mosaicism in children with developmental disorders compared to healthy controls.
  • To quantify the pathogenic burden of mosaic structural abnormalities in developmental disorders.

Main Methods:

  • Developed an analytical pipeline to detect large-scale mosaicism.
  • Conducted a case-control study comparing 1303 children with developmental disorders and 5094 healthy children.
  • Performed a meta-analysis including 7000 additional children with congenital diseases and applied a trio-based mosaic detection algorithm.

Main Results:

  • Identified a substantial enrichment of large-scale mosaicism in children with developmental disorders (odds ratio = 39.4, P < 10^-6).
  • Meta-analysis confirmed significant enrichment (P < 1.784e-11).
  • Detected 12 structural mosaic abnormalities in 1303 children (0.9%), with most deemed pathogenic based on genotype-phenotype correlations.

Conclusions:

  • Structural mosaicism is a significant genetic cause of developmental disorders.
  • The study quantifies the burden of mosaicism, supporting its clinical relevance.
  • Findings aid in interpreting the pathogenicity of mosaic variants in affected children.