Rapid restriction mapping of cosmids by sequence-specific triple-helix-mediated affinity capture.

Abstract:

:A simple and rapid strategy for restriction mapping based on sequence-specific triple-helix affinity capture (TAC) was developed. The strategy was applied to the analysis of cosmid clones by the construction of a new cosmid vector, ScosTriplex-II, containing two different triple-helix-forming sequences flanking the cloning site of the original SuperCos-1 cosmid vector. For restriction mapping, the recombinant cosmid DNA is digested with NotI restriction enzyme or with one of four intron-encoded endonucleases for excision of intact inserts followed by controlled partial digestion with a mapping enzyme used in conjunction with the corresponding methyltransferase. The partial digestion products are combined with biotinylated triple-helix-forming oligonucleotides to form a triple-helical complex. The triple-helix complexes are immobilized on streptavidin-coated magnetic beads, washed, and eluted with pH 9 buffer solution. The fragments are separated and directly sized by agarose gel electrophoresis. Bidirectional maps are obtained simultaneously by binding to the two different triple-helix-forming oligonucleotides. No probe labeling, gel drying, blotting to membranes, hybridization, or autoradiography is necessary. Also, TAC conditions that permit gel-free isolation of the terminal restriction fragments from cosmid inserts were found. These advantages afforded by ScosTriplex-II should facilitate the automation of cosmid restriction site fingerprinting needed for large-scale mapping and sequencing projects.

journal_name

Genomics

journal_title

Genomics

authors

Ji H,Francisco T,Smith LM,Guilfoyle RA

doi

10.1006/geno.1996.0030

subject

Has Abstract

pub_date

1996-01-15 00:00:00

pages

185-92

issue

2

eissn

0888-7543

issn

1089-8646

pii

S0888-7543(96)90030-0

journal_volume

31

pub_type

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