RT Journal
A1 Frisch, Matthias
A1 Frech, Kornelie
A1 Klingenhoff, Andreas
A1 Cartharius, Kerstin
A1 Liebich, Ines
A1 Werner, Thomas
T1 In Silico Prediction of Scaffold/Matrix Attachment Regions in Large Genomic Sequences
JF Genome Research 
JO Genome Research 
YR 2002 
FD February 01 
VO 12 
IS 2 
SP 349 
OP 354 
DO 10.1101/gr.206602 
UL http://genome.cshlp.org/content/12/2/349.abstract 
AB Scaffold/matrix attachment regions (S/MARs) are essential regulatory DNA elements of eukaryotic cells. They are major determinants of locus control of gene expression and can shield gene expression from position effects. Experimental detection of S/MARs requires substantial effort and is not suitable for large-scale screening of genomic sequences. In silico prediction of S/MARs can provide a crucial first selection step to reduce the number of candidates. We used experimentally defined S/MAR sequences as the training set and generated a library of new S/MAR-associated, AT-rich patterns described as weight matrices. A new tool called SMARTest was developed that identifies potential S/MARs by performing a density analysis based on the S/MAR matrix library (http://www.genomatix.de/cgi-bin/smartest_pd/smartest.pl). S/MAR predictions were evaluated by using six genomic sequences from animal and plant for which S/MARs and non-S/MARs were experimentally mapped.SMARTest reached a sensitivity of 38% and a specificity of 68%. In contrast to previous algorithms, theSMARTest approach does not depend on the sequence context and is suitable to analyze long genomic sequences up to the size of whole chromosomes. To demonstrate the feasibility of large-scale S/MAR prediction, we analyzed the recently published chromosome 22 sequence and found 1198 S/MAR candidates.