DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule.
DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule.
DNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule.
In the original Sanger method, DNA chains are synthesized on a template strand, but chain growth is stopped when one of four possible dideoxy nucleotides, which lacks a 3' hydroxyl group, becomes incorporated, which prevents the addition of another nucleotide. A population of nested, truncated DNA molecules is produced that represents each of the sites of that particular nucleotide in the template DNA. The molecules are separated according to size in a procedure called electrophoresis, and the inferred nucleotide sequence is deduced by a computer. Later, the method utilizesutilized automated sequencing machines, in which the truncated DNA molecules, labeled with fluorescent tags, are separated by size within thin glass capillaries and detected by laser excitation.
TheDNA sequencing is the process of determining the precise order of nucleotides within a DNA molecule.