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The impact of transposable elements on mammalian development
Jose L Garcia-Perez1,2, Thomas J Widmann2, Ian R Adams1
1Medical Research Council Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh EH4 2XU, UK jose.garcia-perez@igmm.ed.ac.uk ian.adams@igmm.ed.ac.uk.
Transposable elements (TEs), once called junk DNA, significantly impact mammalian development and gene regulation. Their activity generates genetic variation and provides regulatory elements, fueling mammalian evolution.
Area of Science:
- Genetics
- Developmental Biology
- Genomics
Background:
- Transposable elements (TEs) are abundant genetic sequences often misclassified as 'junk DNA'.
- Recent research reveals TEs significantly influence mammalian development and genome regulation.
- Understanding TE impact on genome architecture and gene networks during embryogenesis has advanced.
Purpose of the Study:
- To review the functional impact of transposable elements (TEs) on mammalian developmental processes.
- To discuss how somatic TE activity influences gene regulatory networks.
- To highlight TEs as a source of genetic variation and regulatory innovation in mammalian evolution.
Main Methods:
- Literature review of recent studies on transposable elements in mammals.
- Analysis of TE impact on genome architecture and gene regulation during embryogenesis.
- Investigation of TE mobilization in somatic cells and its role in genetic variation.
Main Results:
- Pre-existing TEs shape genome architecture and protein function in mammalian embryogenesis.
- Active TEs generate genetic variation in both developing and differentiated tissues.
- TEs provide regulatory elements and functional modules that drive mammalian evolution.
Conclusions:
- Transposable elements play a crucial, non-selfish role in mammalian development and evolution.
- Somatic TE activity is a key mechanism for generating genetic diversity and influencing gene regulatory networks.
- TEs are a vital source of evolutionary innovation in mammals.
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