Linked Life Data

18282507

Source:http://linkedlifedata.com/resource/pubmed/id/18282507

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
2008-2-19
pubmed:abstractText
Genomic imprinting is an epigenetic mechanism of transcriptional regulation through which expression of a subset of mammalian genes is restricted to one parental allele. An intriguing characteristic of imprinted genes is that they often cluster in megabase-sized chromosomal domains, indicating that domain-specific mechanisms regulate imprinting. Detailed study of the known imprinted domains has revealed a number of common characteristics. First, all clusters have an imprinting control region (ICR) that is typically 1-5 kb in size and differentially methylated, and that regulates imprinting across the entire domain. Second, the clusters have at least one noncoding RNA (ncRNA) that is usually expressed from the maternal allele and multiple paternally expressed protein-coding genes. Finally, the clusters are likely regulated by one of two mechanisms, transcription of a long ncRNA that silences expression of protein-coding genes bidirectionally in cis and blocking of shared enhancer elements by CCCTC binding factor (CTCF) binding insulators. More recent experiments may even suggest that both mechanisms operate at some clusters. In this chapter, we will describe what is known about imprinting at five well-studied imprinted loci and highlight some of the critical experiments that are required before a full understanding of imprinting mechanisms is achieved.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0065-2660
pubmed:author
pubmed:issnType
Print
pubmed:volume
61
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
207-23
pubmed:dateRevised
2011-10-7
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Regulation of imprinting in clusters: noncoding RNAs versus insulators.
pubmed:affiliation
Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA.
pubmed:publicationType
Journal Article, Review, Research Support, N.I.H., Extramural