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Published online 6 May 2002. doi:10.1083/jcb.200111071
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© The Rockefeller University Press, 0021-9525/2002/5/579 $5.00
The Journal of Cell Biology, Volume 157, Number 4, May 13, 2002 579-589


Article

Spatial organization of active and inactive genes and noncoding DNA within chromosome territories



Nicola L. Mahy, Paul E. Perry, Susan Gilchrist, Richard A. Baldock and Wendy A. Bickmore

Medical Research Council Human Genetics Unit, Edinburgh EH4 2XU, United Kingdom

Address correspondence to Wendy A. Bickmore, MRC Human Genetics Unit, Crewe Rd., Edinburgh, EH4 2XU, UK. Tel.:44-131-332-2471. Fax: 44-131-343-2620. E-mail: W.Bickmore{at}hgu.mrc.ac.uk

The position of genes within the nucleus has been correlated with their transcriptional activity. The interchromosome domain model of nuclear organization suggests that genes preferentially locate at the surface of chromosome territories. Conversely, high resolution analysis of chromatin fibers suggests that chromosome territories do not present accessibility barriers to transcription machinery.

To clarify the relationship between the organization of chromosome territories and gene expression, we have used fluorescence in situ hybridization to analyze the spatial organization of a contiguous ~1 Mb stretch of the Wilms' tumor, aniridia, genitourinary anomalies, mental retardation syndrome region of the human genome and the syntenic region in the mouse. These regions contain constitutively expressed genes, genes with tissue-restricted patterns of expression, and substantial regions of intergenic DNA. We find that there is a spatial organization within territories that is conserved between mouse and humans: certain sequences do preferentially locate at the periphery of the chromosome territories in both species. However, we do not detect genes necessarily at the periphery of chromosome territories or at the surface of subchromosomal domains. Intraterritory organization is not different among cell types that express different combinations of the genes under study.

Our data demonstrate that transcription of both ubiquitous and tissue-restricted genes is not confined to the periphery of chromosome territories, suggesting that the basal transcription machinery and transcription factors can readily gain access to the chromosome interior.

Key Words: chromatin; chromosome territories; nuclear organization; synteny; transcription


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