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Related Experiment Videos

Interactions between imprinting effects: summary and review.

B M Cattanach1, C V Beechey, J Peters

  • 1Mammalian Genetics Unit, Medical Research Council, Harwell, Didcot, UK. b.cattanach@har.mrc.ac.uk

Cytogenetic and Genome Research
|April 1, 2006
PubMed
Summary
This summary is machine-generated.

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Genomic imprinting in mice, involving uniparental duplications, causes developmental and growth abnormalities due to incorrect gene dosages. Placental survival is key to the evolution of genomic imprinting.

Area of Science:

  • Developmental Biology
  • Genetics
  • Evolutionary Biology

Background:

  • Uniparental disomies (UPD) in mice lead to developmental abnormalities affecting growth.
  • These defects arise from incorrect gene dosages of imprinted genes from maternal or paternal chromosomes.
  • Interactions between imprinting effects in partial disomies influence fetal, placental, and postnatal development.

Purpose of the Study:

  • To investigate the role of imprinted genes in developmental abnormalities using mouse models.
  • To explore the evolutionary implications of genomic imprinting based on growth regulation.
  • To understand the interaction effects of imprinting on fetal and placental growth.

Main Methods:

  • Utilizing mice with defined uniparental duplications for specific chromosomal regions.

Related Experiment Videos

  • Analyzing developmental abnormalities and growth defects in these mouse models.
  • Comparing findings with the 'conflict hypothesis' of genomic imprinting evolution.

    • Main Results:

    • Uniparental duplications result in a spectrum of growth-related developmental abnormalities.
    • Dosage imbalances of imprinted genes are the primary cause of these defects.
    • Interactions between imprinting effects modify fetal, placental, and postnatal development.

    Conclusions:

    • Genomic imprinting evolves through selection favoring paternal alleles for embryonic growth and maternal alleles for limiting growth.
    • The findings support the 'conflict hypothesis' but do not identify common growth axes for imprinted gene interaction.
    • Placental survival is identified as a central factor in the evolution of genomic imprinting.