Yoder, JA, Walsh, CP and Bestor, TH (1997) Cytosine methylation and the ecology of intragenomic parasites. TRENDS IN GENETICS, 13 (8). pp. 335-340. [Journal article]
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Most of the 5-methylcytosine in mammalian DNA resides in transposons, which are specialized intragenomic parasites that represent at least 35% of the genome. Transposon promoters are inactive when methylated and, over time, C --> T transition mutations at methylated sites destroy many transposons. Apart from that subset of genes subject to X inactivation and genomic imprinting, no cellular gene in a non-expressing tissue has been proven to be methylated in a pattern that prevents transcription. It has become increasingly difficult to hold that reversible promoter methylation is commonly involved in developmental gene control; instead, suppression of parasitic sequence elements appears to be the primary function of cytosine methylation, with crucial secondary roles in allele-specific gene expression as seen in X inactivation and genomic imprinting.
|Item Type:||Journal article|
|Faculties and Schools:||Faculty of Life and Health Sciences > School of Biomedical Sciences|
Faculty of Life and Health Sciences
|Research Institutes and Groups:||Biomedical Sciences Research Institute > Molecular Medicine > Transcriptional Regulation & Epigenetics|
Biomedical Sciences Research Institute > Molecular Medicine
Biomedical Sciences Research Institute
|Deposited By:||Professor Colum Walsh|
|Deposited On:||02 Apr 2012 09:52|
|Last Modified:||11 Dec 2012 14:49|
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