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Related Experiment Videos

Imprinting defects on human chromosome 15.

B Horsthemke1, K Buiting

  • 1Institut fur Humangenetik, Universitatsklinikum Essen, Essen, Germany. b.horsthemke@uni-essen.de

Cytogenetic and Genome Research
|April 1, 2006
PubMed
Summary
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Prader-Willi syndrome (PWS) and Angelman syndrome (AS) result from faulty chromosome 15 gene imprinting. Aberrant imprinting, sometimes due to imprinting center microdeletions, offers insights into gene regulation mechanisms.

Area of Science:

  • Genetics
  • Neurogenetics
  • Epigenetics

Background:

  • Prader-Willi syndrome (PWS) and Angelman syndrome (AS) are distinct neurogenetic disorders.
  • Both PWS and AS arise from the loss of function of imprinted genes on chromosome 15.
  • A subset of PWS and AS cases result from aberrant imprinting and gene silencing.

Purpose of the Study:

  • To investigate the mechanisms underlying imprinting defects in PWS and AS.
  • To identify factors involved in imprint erasure, resetting, and maintenance.
  • To characterize the role of the 15q imprinting center (IC) in regulating gene imprinting.

Main Methods:

  • Analysis of imprinting defects in patients with PWS and AS.
  • Identification of microdeletions within the SNURF-SNRPN locus.

Related Experiment Videos

  • Confirmation and extension of findings in mouse models (knock-out and transgenic).

    • Main Results:

    • Imprinting defects in PWS involve a maternal imprint on the paternal chromosome.
    • Imprinting defects in AS involve a paternal imprint on the maternal chromosome.
    • Microdeletions at the 5' end of the SNURF-SNRPN locus define the 15q imprinting center (IC) in ~10% of imprinting defect cases.
    • The majority of imprinting defects occur without DNA sequence changes, suggesting stochastic errors or environmental factors.

    Conclusions:

    • Imprinting defects in PWS and AS provide a model for studying epigenetic regulation.
    • The 15q imprinting center (IC) is crucial for regulating imprinted gene domains.
    • Further research is needed to elucidate the causes of imprinting defects occurring without DNA sequence alterations.