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Related Experiment Videos

Normal development and neoplasia: the imprinting connection

R Ohlsson1, G Franklin

  • 1Department of Animal Development and Genetics, Uppsala University, Sweden.

The International Journal of Developmental Biology
|October 1, 1995
PubMed
Summary

Genomic imprinting, where genes are expressed from only one parent, shows complex variations. Human IGF2 gene expression varies by promoter and in tumors, highlighting the need to re-examine imprinting mechanisms.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Epigenetics

Background:

  • Genomic imprinting involves parent-of-origin-dependent monoallelic gene expression.
  • Imprinted gene transcription can vary developmentally, tissue-specifically, and in tumors.
  • Human IGF2 is a key imprinted gene with complex regulatory mechanisms.

Purpose of the Study:

  • To investigate variations in allele-specific transcription of the human IGF2 gene.
  • To analyze IGF2 expression in tumor cell lines and adult human liver.
  • To understand the promoter-specific regulation of imprinting.

Main Methods:

  • Analysis of allele-specific transcription in tumor cell line sub-clones (Jeg-3).
  • Examination of IGF2 expression across different promoters in adult human liver samples.
  • Comparative analysis of monoallelic and biallelic expression patterns.

Main Results:

  • Tumor cell line sub-clones showed switches between monoallelic and biallelic IGF2 expression.
  • Monoallelic expression from the opposite parental allele was observed.
  • IGF2 imprinting in adult liver is promoter-specific, with P1 promoter showing biallelic expression and others exhibiting complex patterns.

Conclusions:

  • IGF2 imprinting exhibits significant plasticity, varying by promoter and sample.
  • Allele-specific expression patterns can shift in tumor contexts.
  • Re-evaluation of genomic imprinting mechanisms, including cis elements and trans-acting factors, is necessary in normal and pathological states.

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