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Papers In Press, published online ahead of print October 15, 2004
Center for Genome Research, Institute of Biosciences & Technology, Houston, TX 77030
Corresponding Author: rwells{at}ibt.tamushsc.edu
The capacity of (CTG•CAG)n and (GAA•TTC)n repeat tracts in plasmids to induce mutations in DNA flanking regions was evaluated in Eschericha coli. Long repeats of these sequences are involved in the etiology of myotonic dystrophy type 1 (DM1) and Friedreich’s ataxia (FRDA), respectively. Long (CTG•CAG)n (where n=98 and 175) caused the deletion of most, or all, of the repeats and the flanking GFP gene. Deletions of 0.6-1.8 kbp were found as well as inversions. Shorter repeat tracts (where n=0 or 17) were essentially inert, as observed for the (GAA•TTC)176 containing plasmid. The orientation of the triplet repeat sequence (TRS) relative to the unidirectional origin of replication had a pronounced effect, signaling the participation of replication and/or repair systems. Also, when the TRS was transcribed, the level of deletions was greatly elevated. Under certain conditions, 30-50% of the products contained gross deletions. DNA sequence analyses of the breakpoint junctions in 47 deletions revealed the presence of 1-8 bp direct or inverted homologies in all cases. Also, the presence of non-B folded conformations (i.e. slipped structures, cruciforms or triplexes) at or near the breakpoints was predicted in all cases. This genetic behavior which was previously unrecognized for a TRS may provide the basis for a new type of instability of the myotonic dystrophy protein kinase (DMPK) gene in patients with a full mutation.
J. Biol. Chem, 10.1074/jbc.M410427200
Submitted on September 10, 2004
Revised on October 13, 2004
Accepted on October 15, 2004
The myotonic dystrophy type 1 triplet repeat sequence induces gross deletions and inversions
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