How imprinting centres work (original) (raw)
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Review Articles| March 30 2006
Laboratory of Developmental Genetics and Imprinting, The Babraham Institute, Cambridge (UK)
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Laboratory of Developmental Genetics and Imprinting, The Babraham Institute, Cambridge (UK)
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Cytogenet Genome Res (2006) 113 (1-4): 81–89.
Abstract
Imprinted genes tend to be clustered in the genome. Most of these clusters have been found to be under the control of discrete DNA elements called imprinting centres (ICs) which are normally differentially methylated in the germline. ICs can regulate imprinted expression and epigenetic marks at many genes in the region, even those which lie several megabases away. Some of the molecular and cellular mechanisms by which ICs control other genes and regulatory regions in the cluster are becoming clear. One involves the insulation of genes on one side of the IC from enhancers on the other, mediated by the insulator protein CTCF and higher-order chromatin interactions. Another mechanism may involve non-coding RNAs that originate from the IC, targeting histone modifications to the surrounding genes. Given that several imprinting clusters contain CTCF dependent insulators and/or non-coding RNAs, it is likely that one or both of these two mechanisms regulate imprinting at many loci. Both mechanisms involve a variety of epigenetic marks including DNA methylation and histone modifications but the hierarchy of and interactions between these modifications are not yet understood. The challenge now is to establish a chain of developmental events beginning with differential methylation of an IC in the germline and ending with imprinting of many genes, often in a lineage dependent manner.
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2006
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