The specific features of genome domains lacking distinct boundaries are considered. These domains cannot be mapped by testing extended genome regions for nuclease sensitivity and thereby differ from structural domains determined at the level of DNA folding in chromatin. Yet they possess the properties of typical functional domains, containing a gene or several coordinated genes along with a complex of cis-regulatory elements, which control these genes. Domains with vague boundaries may be mapped with certain structural tests, e.g., by assessing histone acetylation or the distribution of tissue-specific DNase I-hypersensitive sites through extended genome regions. The mechanisms are described in detail that regulate the function of genes in domains with vague boundaries, including overlapping domains with genes differing in tissue specificity of expression.
Russian Journal of Genetics – Springer Journals
Published: Oct 7, 2004
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