Nucleic acid preparation compositions and methods
First Claim
Patent Images
1. A method for enriching relatively short nucleic acid from a nucleic acid composition, which comprises:
- (a) contacting cell-free nucleic acid from a substantially cell-free biological composition with a solid phase under association conditions, wherein;
(i) the cell-free nucleic acid of the substantially cell-free biological composition comprises relatively short nucleic acid and relatively long nucleic acid,(ii) the relatively short nucleic acid is about 300 base pairs or less;
(iii) the relatively long nucleic acid is larger than about 300 base pairs, and(iv) the association conditions do not include polyethylene glycol;
(b) introducing the solid phase after (a) to dissociation conditions that comprise a salt, wherein;
(i) the salt is not a chaotropic salt, and(ii) the relatively short nucleic acid dissociates from the solid phase under the dissociation conditions, thereby yielding dissociated nucleic acid; and
(c) separating the dissociated nucleic acid from the solid phase, whereby the relatively short nucleic acid is enriched in the dissociated nucleic acid relative to the cell-free nucleic acid from a substantially cell-free biological composition.
1 Assignment
0 Petitions
Accused Products
Abstract
Provided herein are methods and compositions to extract and enrich by, physical separation or amplification, relatively short nucleic acids from a nucleic acid composition containing a high background of longer nucleic acids (e.g., host or maternal nucleic acids; genomic nucleic acid and the like).
-
Citations
24 Claims
-
1. A method for enriching relatively short nucleic acid from a nucleic acid composition, which comprises:
-
(a) contacting cell-free nucleic acid from a substantially cell-free biological composition with a solid phase under association conditions, wherein; (i) the cell-free nucleic acid of the substantially cell-free biological composition comprises relatively short nucleic acid and relatively long nucleic acid, (ii) the relatively short nucleic acid is about 300 base pairs or less; (iii) the relatively long nucleic acid is larger than about 300 base pairs, and (iv) the association conditions do not include polyethylene glycol; (b) introducing the solid phase after (a) to dissociation conditions that comprise a salt, wherein; (i) the salt is not a chaotropic salt, and (ii) the relatively short nucleic acid dissociates from the solid phase under the dissociation conditions, thereby yielding dissociated nucleic acid; and (c) separating the dissociated nucleic acid from the solid phase, whereby the relatively short nucleic acid is enriched in the dissociated nucleic acid relative to the cell-free nucleic acid from a substantially cell-free biological composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
Specification