Partial characterization of nuclear matrix attachment regions from human fibroblast DNA using Alu-polymerase chain reaction.

The proteinaceous nuclear matrix of mammalian cell nuclei has been suggested to be involved in the regulation of chromatin structure, DNA replication, and gene expression. Interaction between cellular DNA and the nuclear matrix is mediated by putative DNA binding sequences, matrix attachment regions (MARs), which may become altered during early events in cellular transformation. Among the cellular changes occurring during the development of neoplasia, all of which may potentially involve the nuclear matrix, are alterations in nuclear structure, loss of control of DNA replication, and significant modifications of cellular gene expression. Therefore, a better understanding of the interaction between DNA and the nuclear matrix is needed. Isolated matrix associated DNA from pulse labeled SV40 transformed human fibroblasts was shown to be enriched in newly replicated DNA, confirming the association of DNA replication with the nuclear matrix as observed by others. Subgenomic fractions of matrix associated DNA enriched in putative MARs sites were prepared from quiescent and logarithmically growing normal human fibroblasts and SV40 transformed human fibroblasts. These fractions of DNA were analyzed by Alu-polymerase chain reaction and agarose gel electrophoresis, revealing complex and unique patterns of DNA products for each cell type investigated. A number of prominent DNA fragments with similar molecular size were found to be present in the amplified DNA products of each DNA source, suggesting that these DNA fragments may represent common DNA sequences which contain MARs sites or which are associated with MARs sites. The application of Alu-polymerase chain reaction to the molecular analysis of nuclear matrix associated DNA may facilitate the isolation and characterization of potentially new human MARs sequences.

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