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Related Experiment Videos

PEG1 expression in maternal uniparental disomy 7

L Cuisset1, C Le Stunff, J M Dupont

  • 1Laboratoire de Biochimie et Génétique Moléculaire, Centre Hospitalier Cochin-Port-Royal, Paris, France.

Annales De Genetique
|January 1, 1997
PubMed
Summary

The imprinted gene PEG1/MEST

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Area of Science:

  • Genetics
  • Genomic Imprinting
  • Human Molecular Biology

Background:

  • PEG1/MEST is an imprinted gene on human chromosome 7q32.
  • Typically, PEG1/MEST exhibits paternal allele expression in early development and biallelic expression in adult blood.
  • Maternal uniparental disomy 7 (mUPD7) provides a unique model to study maternal PEG1/MEST expression.

Purpose of the Study:

  • To investigate the origin of the maternal PEG1/MEST transcript in patients with mUPD7.
  • To characterize PEG1/MEST mRNA expression in individuals with severe growth restriction due to mUPD7.

Main Methods:

  • RT-PCR amplification of PEG1/MEST mRNA from leukocyte RNA.
  • Analysis of PEG1/MEST expression in two patients with mUPD7.
  • Comparison of amplified sequences with known genomic database sequences.

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Main Results:

  • The distal coding region of PEG1/MEST mRNA was amplified from mUPD7 patient leukocytes.
  • Amplification from the first exon of PEG1/MEST was not detected in mUPD7 patients.
  • Database analysis revealed exon 2 joined to a novel sequence, distinct from exon 1.

Conclusions:

  • The observed maternal PEG1/MEST expression in mUPD7 patients likely originates from an alternate maternal upstream promoter.
  • This suggests a complex regulatory mechanism for maternal PEG1/MEST transcription.
  • Further research is needed to fully elucidate the function of this alternate promoter.