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Human Molecular Genetics, 2002, Vol. 11, No. 6 669-674
© 2002 Oxford University Press

Classification of common conserved sequences in mammalian intergenic regions

Alexey S. Kondrashov and Svetlana A. Shabalina+

National Center for Biotechnology Information, National Institutes of Health, 45 Center Drive, Bethesda, MD 20892, USA

Comparisons between orthologous intergenic regions of related genomes reveal numerous hits, i.e. pairs of relatively short highly similar sequences that evolved slowly, perhaps due to selective constraint. We analyzed and classified 2638 hits found within 100 pairs of complete, orthologous intergenic regions of human and murine genomes. We identified all common fragments of hits that align well with many other hits and constructed their classification. Our analysis revealed 20 abundant classes each containing 10 or more fragments. Fragments of the same class may perform the same function, e.g. bind a particular protein. Ten of the abundant classes apparently correspond to known functional consensuses, whereas others may represent novel conserved sites. Thus, large-scale comparative analysis of slowly evolving intergenic sequences can provide valuable insights into their function.

+ To whom correspondence should be addressed. Tel: +1 301 594 5693; Fax: +1 301 480 2918; Email: shabalin@ncbi.nlm.nih.gov


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