Natera, Inc.

Jason Tong

James Stray

Xiaoke Wang

Disclosed here is a method for isolating nucleic acids from a biological sample, comprising: (a) contacting a first composition comprising nucleic acids obtained from a biological sample with a first matrix under a low-stringency binding condition having less than 1% aliphatic alcohols that binds less than 5% of nucleic acids of shorter than about 118 bp and more than 30% of nucleic acids longer than about 194 bp to a first matrix; and (b) contacting a second composition comprising remainder of the first composition with a second matrix under a high-stringency binding condition having less than 1% aliphatic alcohol that binds more than 70% of nucleic acids longer than about 72 bp and 30% of nucleic acids longer than about 50 bp to the second matrix. Further disclosed is a kit for isolating nucleic acids from a biological sample, comprising (a) a first binding buffer for establishing a low-stringency binding condition having less than 1% aliphatic alcohols that binds less than 5% of nucleic acids shorter than about 118 bp and more than 30% of nucleic acids longer than about 194 bp to a matrix, and (b) a second binding buffer for establishing a high-stringency binding condition having less than 1% aliphatic alcohol that binds more than 70% of nucleic acids longer than about 72 bp and 30% of nucleic acids longer than about 50 bp to the matrix.

Methods for isolating nucleic acids with size selection

Disclosed here is a composition for isolating nucleic acids from a biological sample, comprising a chaotropic compound and a solvent, wherein the solvent comprises a nitrile compound, tetrahydrofuran, or a combination thereof. Also disclosed is a method for binding nucleic acids to a matrix, comprising: contacting the nucleic acids from a biological sample with the matrix in the presence of a chaotropic compound and a solvent, wherein the solvent comprises a nitrile compound, tetrahydrofuran, or a combination thereof, thereby binding the nucleic acids to the matrix. Further disclosed is a kit for isolating nucleic acids from a biological sample comprising a binding buffer, wherein the binding buffer comprises a chaotropic compound and a solvent, wherein the solvent comprises a nitrile compound, tetrahydrofuran, or a combination thereof.

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San Carlos, CA, United States of America

Jason Tong