Improved procedure for the preparation of DNA restriction fragments suitable for sequencing.
A rapid and integrated procedure was developed for the preparation of small DNA restriction fragments (< or = 1000 bp) starting from a large cosmid (35,000 bp) containing exogenous DNA. The process is based on restriction enzymatic digestion followed by HPLC separation and fractions collection. All DNA fragments are separated in a single run, detected "on-line" by UV absorption, and straightforward collected with very high recovery. Small fragments can be directly subjected to the sequence procedure, whereas those larger than 1000 bp are redigested with a second enzyme, the fractionated subfragments are separated, ligated to plasmid vector, and sequenced. A human genomic cosmid of 35,000 bp (26H7) has been chosen as a model.
Pietta
P
P
Dipartimento Scienze e Tecnologie Biomediche, Milan, Italy.
Mauri
P
P
Appierto
V
V
Mostardini
M
M
Biunno
I
I
D001483:Base Sequence; D005591:Chemical Fractionation; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D015183:Restriction Mapping