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Normal adaptive function with learning disability in duplication 8p including band p22

S S Sklower Brooks1, M Genovese, H Gu

  • 1New York State Institute for Basic Research in Developmental Disabilities, Staten Island 10314, USA.

American Journal of Medical Genetics
|July 23, 1998
PubMed
Summary
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Clinical genetics·2010

Duplication 8p22 to 8pter typically causes severe developmental issues. However, a Y;8 translocation in one family led to normal function despite this genetic duplication, suggesting a milder outcome.

Area of Science:

  • Human Genetics
  • Clinical Cytogenetics
  • Reproductive Biology

Background:

  • Duplication of chromosome 8p (8p duplication) is typically associated with severe intellectual disability, facial anomalies, and malformations of the hands, heart, and brain.
  • The extent and location of the duplicated segment are critical in determining the clinical phenotype of chromosomal abnormalities.

Observation:

  • A large kindred with a Y;8 translocation was studied, revealing individuals with duplication of the 8p22 to 8pter region.
  • Despite the unbalanced karyotype, individuals within this family exhibited normal adaptive function.
  • Genetic analysis using G-banding and fluorescence in situ hybridization (FISH) confirmed the specific chromosomal rearrangement.

Findings:

  • The study identified a milder clinical outcome for trisomy 8p22-->8pter compared to previously reported cases involving longer or more proximal duplications of 8p.

Related Experiment Videos

  • This suggests that the specific segment duplicated (8p22-->8pter) may not carry all the critical genetic information responsible for the severe phenotype typically observed in 8p duplication syndrome.

    • Implications:

    • These findings refine the understanding of genotype-phenotype correlations in 8p duplication, highlighting the importance of the duplicated chromosomal region.
    • This research contributes to the genetic counseling of families with similar chromosomal rearrangements, offering a more nuanced prognosis.
    • Further investigation into the specific genes within the 8p22-->8pter region may elucidate the mechanisms underlying the normal adaptive function observed.