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• W2113463790 endingPage "1718" @default.
• W2113463790 startingPage "1707" @default.
• W2113463790 abstract "15q11- q13 contains many imprinted genes, and undergoes duplicon-mediated rearrangements, including deletions, duplications and triplications, and generation of marker chromosomes. Abnormal phenotypes, including language delays and autism spectrum disorders, are primarily observed with maternal 15q11- q13 duplication. To determine possible epigenetic effects on expression within duplicated 15q11- q13 regions, we utilized RNA-FISH to directly observe gene expression. RNA-FISH, unlike RT-PCR, is polymorphism-independent, and it also detects relative levels of expression at each allele. Unamplified, gene-specific RNA signals were detected using cDNA probes. Subsequent DNA-FISH confirmed RNA signals and assigned parental origin by colocalization of genomic probes. SNRPN and NDN expression was detected primarily from paternal alleles. Control Dystrobrevin transcripts were detected equally from both alleles; however, maternal-UBE3A signals were consistently larger than paternal signals in normal fibroblasts and in neural-precursor cells. Larger UBE3A signals were also observed on one or both maternal alleles in a cell line carrying a maternal interstitial duplication, on both alleles of a maternally derived marker(15) chromosome, and occasionally on a paternal allele in a cell line carrying a paternal interstitial duplication. Expression of NDNL2, just distal to the duplicated region, was not markedly altered but paralleled changes in UBE3A expression. Excess total maternal-UBE3A RNA was confirmed by Northern blot analysis of cell lines carrying 15q11- q13 duplications or triplications. These results demonstrate that: (1) UBE3A is imprinted in fibroblasts, lymphoblasts and neural-precursor cells; (2) allelic imprint status is maintained in the majority of cells upon duplication both in cis and in trans; and (3) alleles on specific types of duplications may exhibit an increase in expression levels/loss of expression constraints." @default.
• W2113463790 created "2016-06-24" @default.
• W2113463790 creator A5002090056 @default.
• W2113463790 creator A5020019979 @default.
• W2113463790 creator A5088823535 @default.
• W2113463790 date "2002-07-15" @default.
• W2113463790 modified "2023-10-13" @default.
• W2113463790 title "Allele-specific expression analysis by RNA-FISH demonstrates preferential maternal expression of UBE3A and imprint maintenance within 15q11- q13 duplications" @default.
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• W2113463790 doi "https://doi.org/10.1093/hmg/11.15.1707" @default.
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