Dna sequencing by mass spectrometry

Details Dna sequencing by mass spectrometry Dna sequencing by mass spectrometry

C - Chemistry, Metallurgy

12

Q

C12Q 1/68 (2006.01) C07H 21/00 (2006.01) G01N 23/00 (2006.01) H01J 49/26 (2006.01)

Patent

CA 2153387

The invention describes a new method to sequence DNA. The improvements over the existing DNA sequencing technologies are high speed, high throughout, no electrophoresis and gel reading artifacts due to the complete absence of an electrophoretic step, and no costly reagents involving various substitutions with stable isotopes. The invention utilizes the Sanger sequencing strategy and assembles the sequence information by analysis of the nested fragments obtained by base-specific chain termination via their different molecular masses using mass spectrometry, as for example, MALDI or ES mass spectrometry. A further increase in throughpout, can be obtained by introducing mass-modifications in the oligonucleotide primer, chain-terminating nucleoside triphosphates and/or in the chain-elongating nucleoside triphosphates, as well as using integrated tag sequences which allow multiplexing by hybridization of tag specific probes with mass-differentiated molecular weights.

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