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Related Experiment Videos

Small supernumerary marker chromosomes (SMCs): genotype-phenotype correlation and classification.

Heike Starke1, Angela Nietzel, Anja Weise

  • 1Institut für Humangenetik und Anthropologie, Kollegiengasse 10, 07743 Jena, Germany.

Human Genetics
|September 19, 2003
PubMed
Summary

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Small supernumerary marker chromosomes (SMCs) can cause abnormal phenotypes due to varying DNA content, mosaicism, or uniparental disomy (UPD). This study analyzes 35 SMCs, linking specific trisomies to clinical outcomes and proposing a new classification.

Area of Science:

  • Human Genetics
  • Molecular Cytogenetics
  • Clinical Genetics

Background:

  • Small supernumerary marker chromosomes (SMCs) occur in 0.05% of the population.
  • Approximately 30% of SMC carriers exhibit abnormal phenotypes, influenced by euchromatic DNA content, mosaicism, or uniparental disomy (UPD).
  • Predicting clinical outcomes in SMC carriers is challenging due to these variable factors.

Purpose of the Study:

  • To investigate the relationship between specific SMCs and clinical phenotypes.
  • To identify molecular cytogenetic markers associated with abnormal outcomes.
  • To propose a classification system for SMCs based on genetic and cytogenetic characteristics.

Main Methods:

  • Analysis of 35 SMCs using molecular cytogenetic techniques.

Related Experiment Videos

  • Techniques included centromere-specific multicolor fluorescence in situ hybridization (cenM-FISH), multicolor banding (MCB), and subcentromere-specific multicolor FISH (subcenM-FISH).
  • Detection of partial trisomies and uniparental disomy (UPD).

    • Main Results:

    • Seven cases with abnormal phenotypes showed subcentromeric trisomies.
    • Eight cases with normal phenotypes had proximal euchromatic material as partial trisomies.
    • Uniparental disomy (UPD) was detected in two cases, indicating an increased risk in SMC carriers.

    Conclusions:

    • Specific small proximal trisomies (e.g., 1p, 1q, 2p) are associated with clinical manifestations.
    • Other partial trisomies (e.g., 2q, 3p) may not cause significant symptoms.
    • A proposed classification of SMCs integrates molecular genetic and cytogenetic findings for better outcome prediction.