DNA restriction site mapping
First Claim
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1. A method of mapping a polynucleotide, the method comprising the steps of:
- (a) providing a plurality of populations of restriction fragments, the restriction fragments of each population having an interior and ends defined by digesting the polynucleotide with a plurality of combinations of restriction endonucleases, and each restriction fragment being inserted into a vector;
(b) cleaving each vector to remove the interior of the restriction fragment and to leave a segment of each end of the restriction fragment in the vector;
(c) circularizing each vector so that the segments of each end of each restriction fragment are ligated together to form a pair of segments;
(d) determining the nucleotide sequences of a sample of pairs of segments to obtain a sample of pairs of nucleotide sequences; and
(e) ordering the pairs of nucleotide sequences by matching the nucleotide sequences between pairs to form a map of the polynucleotide.
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Abstract
The invention provides a method for constructing a high resolution physical map of a polynucleotide. In accordance with the invention, nucleotide sequences are determined at the ends of restriction fragments produced by a plurality of digestions with a plurality of combinations of restriction endonucleases so that a pair of nucleotide sequences is obtained for each restriction fragment. A physical map of the polynucleotide is constructed by ordering the pairs of sequences by matching the identical sequences among the pairs.
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6 Claims
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1. A method of mapping a polynucleotide, the method comprising the steps of:
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(a) providing a plurality of populations of restriction fragments, the restriction fragments of each population having an interior and ends defined by digesting the polynucleotide with a plurality of combinations of restriction endonucleases, and each restriction fragment being inserted into a vector; (b) cleaving each vector to remove the interior of the restriction fragment and to leave a segment of each end of the restriction fragment in the vector; (c) circularizing each vector so that the segments of each end of each restriction fragment are ligated together to form a pair of segments; (d) determining the nucleotide sequences of a sample of pairs of segments to obtain a sample of pairs of nucleotide sequences; and (e) ordering the pairs of nucleotide sequences by matching the nucleotide sequences between pairs to form a map of the polynucleotide. - View Dependent Claims (2, 3, 4)
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5. A method of analyzing gene expression in a cell or tissue, the method comprising the steps of:
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(a) forming a population of cDNA molecules from mRNA of a cell or tissue; (b) determining the nucleotide sequence of a portion of each end of each cDNA molecule of the population so that a pair of nucleotide sequences is obtained for each cDNA of the population; and (c) tabulating the pairs of nucleotide sequences to form a frequency distribution of gene expression in the cell or tissue. - View Dependent Claims (6)
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Specification