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Related Experiment Videos

Euchromatic variant 16p+. Implications in prenatal diagnosis.

I López Pajares1, O Villa, M Salido

  • 1Department of Medical Genetics, Hospital Universitario La Paz, Madrid, Spain.

Prenatal Diagnosis
|April 25, 2006
PubMed
Summary
This summary is machine-generated.

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Euchromatic variants on chromosome 16 (16p+) can be normal genetic variations. This familial case highlights that these rare 16p+ variants are often benign polymorphisms.

Area of Science:

  • Cytogenetics
  • Human Genetics
  • Molecular Biology

Background:

  • Euchromatic imbalances typically cause phenotypic effects.
  • Euchromatic variants of chromosome 16 (16p+) with normal phenotypes are rare exceptions.
  • Phenotypically neutral euchromatic duplications and deletions are increasingly documented but remain uncommon.

Observation:

  • A novel familial case of a euchromatic variant 16p+ was identified.
  • Prenatal diagnosis can lead to misinterpretation of these rare variants.
  • Fluorescence in situ hybridization confirmed an amplified signal on chromosome 16, involving the FLJ43855 gene.

Findings:

  • The identified 16p+ variant involves amplification of pseudogenetic sequences.
  • This specific 16p+ variant is considered a polymorphism.

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  • The variant was observed in individuals with a normal phenotype.

    • Implications:

    • Accurate identification of euchromatic variants is crucial, especially during prenatal diagnosis.
    • Understanding these variants as polymorphisms prevents unnecessary clinical concern.
    • Further research into the prevalence and genetic basis of euchromatic variants is warranted.