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pubmed-article:8099283pubmed:abstractTextA novel restriction polymorphism, probably due to tissue-specific methylation, has been identified at the human epidermal-growth-factor-receptor (EGF-R) gene. DNA isolated from smooth muscle showed altered EcoRI restriction bands when hybridized with different fragments of the EGF-R cDNA. These bands were absent in brain or leucocyte DNA samples from the same individuals. Three restriction sites, partly resistant to cleavage by EcoRI, were characterized in muscle DNA which were not clustered but instead were scattered along the gene. The flanking sequences of one of these resistant EcoRI sites were determined. This specific EcoRI site was followed by a 3'-guanosine generating a methylatable EcoRI sequence. This suggests that the failure to digest to completion these EcoRI sites was due to modification by methylation. In addition, we noted that EcoRI sites were affected at both alleles, indicating that de novo methylation changes, and not methylation events related to genomic imprinting, would cause the muscle-specific EcoRI pattern. Also abnormal restriction fragments with XbaI were observed in muscle DNA. A large number of unrelated muscle DNA samples have been analysed, and all of them displayed an identical EcoRI polymorphic pattern, suggesting that DNA modification by de novo methylation events could be functionally relevant.lld:pubmed
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pubmed-article:8099283pubmed:dateRevised2009-11-19lld:pubmed
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pubmed-article:8099283pubmed:articleTitleDe novo methylation causes a tissue-specific polymorphic EcoRI pattern at the human epidermal growth factor receptor gene.lld:pubmed
pubmed-article:8099283pubmed:affiliationDepartamento de Biología Molecular, Facultad de Ciencias, Universidad Autónoma de Madrid, Spain.lld:pubmed
pubmed-article:8099283pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8099283pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed