Concentration and Cleanup of Nucleic Acid Samples

Inactive Publication Date: 2006-07-20
APPL BIOSYSTEMS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] Aspects of the present invention relate to sample concentration and cleanup; e.g., cleanup of a DNA sample to reduce or eliminate unincorporated dyes. Among other things, the present invention provides for direct loading of unpurified sequencing reactions on microfabricated separation devices. By way of the present methods and devices, the need to purify sequencing reactions (e.g., after themocycling, which typically involves centrifugation) can be reduced or eliminated.

Problems solved by technology

While the technique of Xiong et al. might allow for sufficient signal from direct load on unpurified sequencing samples, it would not be expected to remove unincorporated dyes and contaminants that can obscure the sequencing data.
Because the sample is very salty at this point, the electrokinetic injection process is inefficient and a long injection time is needed to move enough DNA into the capillary to obtain sufficient signal.
The injection time is so long that the peaks would be far too broad to achieve the necessary resolution for DNA sequencing.
The large concentration of dye can migrate with the DNA and may negatively impact some section of the sequencing data.

Method used

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  • Concentration and Cleanup of Nucleic Acid Samples
  • Concentration and Cleanup of Nucleic Acid Samples
  • Concentration and Cleanup of Nucleic Acid Samples

Examples

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example

[0062] This non-limiting example illustrates use of the present methods and devices in sample cleanup and injection; e.g., cleanup and injection of a DNA-containing sample prior to electrophoretic analysis. As this example illustrates, the methods and devices herein can be used, for example, to inject a concentrated plug of DNA into a channel, substantially free from salts and dye terminators that are in the bulk solution.

[0063] Reference is now made to FIGS. 2A, 2B, 2C and 2D, which schematically depict the present example.

[0064] A cross-T format channel device 10 is provided, including (i) a high concentration polymer and Tris-HCl buffer in an injection channel 14 and (ii) a low concentration sieving polymer and TAPS / Tris buffer in a separation channel 16. An unpurified DNA sample 52 is loaded in a reservoir 36 of the channel device 10 (FIG. 2A).

[0065] The unpurified DNA sample is then caused to flow into and along an injection arm of the device (FIG. 2B). For example, under th...

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Abstract

Methods and devices are described for concentration and cleanup of samples containing bio-molecule analytes (e.g., polynucleotides, such as DNA, RNA, PNA). Various embodiments provide for pH-mediated sample concentration and cleanup of nucleic acid samples with channel devices (e.g., cross-T format, microchannel devices).

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional patent application of Ser. No. 10 / 237,537 filed Sep. 9, 2002, which claims priority under 35 U.S.C. § 119(e) to provisional application Ser. No. 60 / 318,269, filed Sep. 7, 2001, both of which are incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to methods and devices for the concentration and cleanup of samples containing analytes. Aspects of the invention relate to pH-mediated sample concentration and cleanup of nucleic acid samples with channel devices. REFERENCES [0003] Backhouse et al., DNA sequencing in a monolithic microchannel device, Electrophoresis 2000, 21, 150-156. [0004] Dolnik et al., Capillary electrophoresis on microchip, Electrophoresis 2000, 21, 41-54. [0005] Grossman and Colburn, Capillary Electrophoresis Theory and Practice, Chapter 1, Academic Press (1992). [0006] Kambara et al., U.S. Pat. No. 5,192,142 (1993). [0007] Madabhushi et al., U.S. ...

Claims

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Application Information

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IPC IPC(8): C07K1/26G01N27/447
CPCC12N15/1017
InventorVOSS, KARL O.
OwnerAPPL BIOSYSTEMS INC