Linked Life Data

10072422

Source:http://linkedlifedata.com/resource/pubmed/id/10072422

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1999-4-29
pubmed:abstractText
Human chromosome region 15q11-q13 contains a cluster of oppositely imprinted genes. Loss of the paternal or the maternal alleles by deletion of the region or by uniparental disomy 15 results in Prader-Willi syndrome (PWS) or Angelman syndrome (AS), respectively. Hence, the two phenotypically distinct neurodevelopmental disorders are caused by the lack of products of imprinted genes. Subsets of PWS and AS patients exhibit 'imprinting mutations', such as small microdeletions within the 5' region of the small nuclear ribonucleoprotein polypeptide N ( SNRPN ) transcription unit which affect the transcriptional activity and methylation status of distant imprinted genes throughout 15q11-q13 in cis. To elucidate the mechanism of these long-range effects, we have analyzed the chromatin structure of the 150 kb SNRPN transcription unit for DNase I- and Msp I-hypersensitive sites. By using an in vivo approach on lymphoblastoid cell lines from PWS and AS individuals, we discovered that the SNRPN exon 1 is flanked by prominent hypersensitive sites on the paternal allele, but is completely inaccessible to nucleases on the maternal allele. In contrast, we identified several regions of increased nuclease hypersensitivity on the maternal allele, one of which coincides with the AS minimal microdeletion region and another lies in intron 1 immediately downstream of the paternal-specific hypersensitive sites. At several sites, parental origin-specific nuclease hypersensitivity was found to be correlated with hypermethylation on the allele contributed by the other parent. The differential parental origin-dependent chromatin conformations might govern access of regulatory protein complexes and/or RNAs which could mediate interaction of the region with other genes.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0964-6906
pubmed:author
pubmed:issnType
Print
pubmed:volume
8
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
555-66
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:10072422-Alleles, pubmed-meshheading:10072422-Angelman Syndrome, pubmed-meshheading:10072422-Autoantigens, pubmed-meshheading:10072422-Binding Sites, pubmed-meshheading:10072422-Cell Line, Transformed, pubmed-meshheading:10072422-Chromatin, pubmed-meshheading:10072422-Chromosomes, Human, Pair 15, pubmed-meshheading:10072422-Cytosine, pubmed-meshheading:10072422-DNA, pubmed-meshheading:10072422-DNA-Cytosine Methylases, pubmed-meshheading:10072422-Deoxyribonuclease HpaII, pubmed-meshheading:10072422-Deoxyribonuclease I, pubmed-meshheading:10072422-Deoxyribonucleases, pubmed-meshheading:10072422-Exons, pubmed-meshheading:10072422-Genomic Imprinting, pubmed-meshheading:10072422-Humans, pubmed-meshheading:10072422-Introns, pubmed-meshheading:10072422-Methylation, pubmed-meshheading:10072422-Nucleic Acid Conformation, pubmed-meshheading:10072422-Prader-Willi Syndrome, pubmed-meshheading:10072422-Restriction Mapping, pubmed-meshheading:10072422-Ribonucleoproteins, Small Nuclear, pubmed-meshheading:10072422-Transcription, Genetic, pubmed-meshheading:10072422-snRNP Core Proteins
pubmed:year
1999
pubmed:articleTitle
In vivo nuclease hypersensitivity studies reveal multiple sites of parental origin-dependent differential chromatin conformation in the 150 kb SNRPN transcription unit.
pubmed:affiliation
Howard Hughes Medical Institute and Department of Genetics, Stanford University School of Medicine, Stanford CA 94305-5323, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't